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netadmin
2024-08-03 12:27:31 +03:00
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13
comfy/checkpoint_pickle.py Normal file
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import pickle
load = pickle.load
class Empty:
pass
class Unpickler(pickle.Unpickler):
def find_class(self, module, name):
#TODO: safe unpickle
if module.startswith("pytorch_lightning"):
return Empty
return super().find_class(module, name)

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comfy/cldm/cldm.py Normal file
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#taken from: https://github.com/lllyasviel/ControlNet
#and modified
import torch
import torch as th
import torch.nn as nn
from ..ldm.modules.diffusionmodules.util import (
zero_module,
timestep_embedding,
)
from ..ldm.modules.attention import SpatialTransformer
from ..ldm.modules.diffusionmodules.openaimodel import UNetModel, TimestepEmbedSequential, ResBlock, Downsample
from ..ldm.util import exists
from .control_types import UNION_CONTROLNET_TYPES
from collections import OrderedDict
import comfy.ops
from comfy.ldm.modules.attention import optimized_attention
class OptimizedAttention(nn.Module):
def __init__(self, c, nhead, dropout=0.0, dtype=None, device=None, operations=None):
super().__init__()
self.heads = nhead
self.c = c
self.in_proj = operations.Linear(c, c * 3, bias=True, dtype=dtype, device=device)
self.out_proj = operations.Linear(c, c, bias=True, dtype=dtype, device=device)
def forward(self, x):
x = self.in_proj(x)
q, k, v = x.split(self.c, dim=2)
out = optimized_attention(q, k, v, self.heads)
return self.out_proj(out)
class QuickGELU(nn.Module):
def forward(self, x: torch.Tensor):
return x * torch.sigmoid(1.702 * x)
class ResBlockUnionControlnet(nn.Module):
def __init__(self, dim, nhead, dtype=None, device=None, operations=None):
super().__init__()
self.attn = OptimizedAttention(dim, nhead, dtype=dtype, device=device, operations=operations)
self.ln_1 = operations.LayerNorm(dim, dtype=dtype, device=device)
self.mlp = nn.Sequential(
OrderedDict([("c_fc", operations.Linear(dim, dim * 4, dtype=dtype, device=device)), ("gelu", QuickGELU()),
("c_proj", operations.Linear(dim * 4, dim, dtype=dtype, device=device))]))
self.ln_2 = operations.LayerNorm(dim, dtype=dtype, device=device)
def attention(self, x: torch.Tensor):
return self.attn(x)
def forward(self, x: torch.Tensor):
x = x + self.attention(self.ln_1(x))
x = x + self.mlp(self.ln_2(x))
return x
class ControlledUnetModel(UNetModel):
#implemented in the ldm unet
pass
class ControlNet(nn.Module):
def __init__(
self,
image_size,
in_channels,
model_channels,
hint_channels,
num_res_blocks,
dropout=0,
channel_mult=(1, 2, 4, 8),
conv_resample=True,
dims=2,
num_classes=None,
use_checkpoint=False,
dtype=torch.float32,
num_heads=-1,
num_head_channels=-1,
num_heads_upsample=-1,
use_scale_shift_norm=False,
resblock_updown=False,
use_new_attention_order=False,
use_spatial_transformer=False, # custom transformer support
transformer_depth=1, # custom transformer support
context_dim=None, # custom transformer support
n_embed=None, # custom support for prediction of discrete ids into codebook of first stage vq model
legacy=True,
disable_self_attentions=None,
num_attention_blocks=None,
disable_middle_self_attn=False,
use_linear_in_transformer=False,
adm_in_channels=None,
transformer_depth_middle=None,
transformer_depth_output=None,
attn_precision=None,
union_controlnet_num_control_type=None,
device=None,
operations=comfy.ops.disable_weight_init,
**kwargs,
):
super().__init__()
assert use_spatial_transformer == True, "use_spatial_transformer has to be true"
if use_spatial_transformer:
assert context_dim is not None, 'Fool!! You forgot to include the dimension of your cross-attention conditioning...'
if context_dim is not None:
assert use_spatial_transformer, 'Fool!! You forgot to use the spatial transformer for your cross-attention conditioning...'
# from omegaconf.listconfig import ListConfig
# if type(context_dim) == ListConfig:
# context_dim = list(context_dim)
if num_heads_upsample == -1:
num_heads_upsample = num_heads
if num_heads == -1:
assert num_head_channels != -1, 'Either num_heads or num_head_channels has to be set'
if num_head_channels == -1:
assert num_heads != -1, 'Either num_heads or num_head_channels has to be set'
self.dims = dims
self.image_size = image_size
self.in_channels = in_channels
self.model_channels = model_channels
if isinstance(num_res_blocks, int):
self.num_res_blocks = len(channel_mult) * [num_res_blocks]
else:
if len(num_res_blocks) != len(channel_mult):
raise ValueError("provide num_res_blocks either as an int (globally constant) or "
"as a list/tuple (per-level) with the same length as channel_mult")
self.num_res_blocks = num_res_blocks
if disable_self_attentions is not None:
# should be a list of booleans, indicating whether to disable self-attention in TransformerBlocks or not
assert len(disable_self_attentions) == len(channel_mult)
if num_attention_blocks is not None:
assert len(num_attention_blocks) == len(self.num_res_blocks)
assert all(map(lambda i: self.num_res_blocks[i] >= num_attention_blocks[i], range(len(num_attention_blocks))))
transformer_depth = transformer_depth[:]
self.dropout = dropout
self.channel_mult = channel_mult
self.conv_resample = conv_resample
self.num_classes = num_classes
self.use_checkpoint = use_checkpoint
self.dtype = dtype
self.num_heads = num_heads
self.num_head_channels = num_head_channels
self.num_heads_upsample = num_heads_upsample
self.predict_codebook_ids = n_embed is not None
time_embed_dim = model_channels * 4
self.time_embed = nn.Sequential(
operations.Linear(model_channels, time_embed_dim, dtype=self.dtype, device=device),
nn.SiLU(),
operations.Linear(time_embed_dim, time_embed_dim, dtype=self.dtype, device=device),
)
if self.num_classes is not None:
if isinstance(self.num_classes, int):
self.label_emb = nn.Embedding(num_classes, time_embed_dim)
elif self.num_classes == "continuous":
print("setting up linear c_adm embedding layer")
self.label_emb = nn.Linear(1, time_embed_dim)
elif self.num_classes == "sequential":
assert adm_in_channels is not None
self.label_emb = nn.Sequential(
nn.Sequential(
operations.Linear(adm_in_channels, time_embed_dim, dtype=self.dtype, device=device),
nn.SiLU(),
operations.Linear(time_embed_dim, time_embed_dim, dtype=self.dtype, device=device),
)
)
else:
raise ValueError()
self.input_blocks = nn.ModuleList(
[
TimestepEmbedSequential(
operations.conv_nd(dims, in_channels, model_channels, 3, padding=1, dtype=self.dtype, device=device)
)
]
)
self.zero_convs = nn.ModuleList([self.make_zero_conv(model_channels, operations=operations, dtype=self.dtype, device=device)])
self.input_hint_block = TimestepEmbedSequential(
operations.conv_nd(dims, hint_channels, 16, 3, padding=1, dtype=self.dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, 16, 16, 3, padding=1, dtype=self.dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, 16, 32, 3, padding=1, stride=2, dtype=self.dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, 32, 32, 3, padding=1, dtype=self.dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, 32, 96, 3, padding=1, stride=2, dtype=self.dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, 96, 96, 3, padding=1, dtype=self.dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, 96, 256, 3, padding=1, stride=2, dtype=self.dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, 256, model_channels, 3, padding=1, dtype=self.dtype, device=device)
)
self._feature_size = model_channels
input_block_chans = [model_channels]
ch = model_channels
ds = 1
for level, mult in enumerate(channel_mult):
for nr in range(self.num_res_blocks[level]):
layers = [
ResBlock(
ch,
time_embed_dim,
dropout,
out_channels=mult * model_channels,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
dtype=self.dtype,
device=device,
operations=operations,
)
]
ch = mult * model_channels
num_transformers = transformer_depth.pop(0)
if num_transformers > 0:
if num_head_channels == -1:
dim_head = ch // num_heads
else:
num_heads = ch // num_head_channels
dim_head = num_head_channels
if legacy:
#num_heads = 1
dim_head = ch // num_heads if use_spatial_transformer else num_head_channels
if exists(disable_self_attentions):
disabled_sa = disable_self_attentions[level]
else:
disabled_sa = False
if not exists(num_attention_blocks) or nr < num_attention_blocks[level]:
layers.append(
SpatialTransformer(
ch, num_heads, dim_head, depth=num_transformers, context_dim=context_dim,
disable_self_attn=disabled_sa, use_linear=use_linear_in_transformer,
use_checkpoint=use_checkpoint, attn_precision=attn_precision, dtype=self.dtype, device=device, operations=operations
)
)
self.input_blocks.append(TimestepEmbedSequential(*layers))
self.zero_convs.append(self.make_zero_conv(ch, operations=operations, dtype=self.dtype, device=device))
self._feature_size += ch
input_block_chans.append(ch)
if level != len(channel_mult) - 1:
out_ch = ch
self.input_blocks.append(
TimestepEmbedSequential(
ResBlock(
ch,
time_embed_dim,
dropout,
out_channels=out_ch,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
down=True,
dtype=self.dtype,
device=device,
operations=operations
)
if resblock_updown
else Downsample(
ch, conv_resample, dims=dims, out_channels=out_ch, dtype=self.dtype, device=device, operations=operations
)
)
)
ch = out_ch
input_block_chans.append(ch)
self.zero_convs.append(self.make_zero_conv(ch, operations=operations, dtype=self.dtype, device=device))
ds *= 2
self._feature_size += ch
if num_head_channels == -1:
dim_head = ch // num_heads
else:
num_heads = ch // num_head_channels
dim_head = num_head_channels
if legacy:
#num_heads = 1
dim_head = ch // num_heads if use_spatial_transformer else num_head_channels
mid_block = [
ResBlock(
ch,
time_embed_dim,
dropout,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
dtype=self.dtype,
device=device,
operations=operations
)]
if transformer_depth_middle >= 0:
mid_block += [SpatialTransformer( # always uses a self-attn
ch, num_heads, dim_head, depth=transformer_depth_middle, context_dim=context_dim,
disable_self_attn=disable_middle_self_attn, use_linear=use_linear_in_transformer,
use_checkpoint=use_checkpoint, attn_precision=attn_precision, dtype=self.dtype, device=device, operations=operations
),
ResBlock(
ch,
time_embed_dim,
dropout,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
dtype=self.dtype,
device=device,
operations=operations
)]
self.middle_block = TimestepEmbedSequential(*mid_block)
self.middle_block_out = self.make_zero_conv(ch, operations=operations, dtype=self.dtype, device=device)
self._feature_size += ch
if union_controlnet_num_control_type is not None:
self.num_control_type = union_controlnet_num_control_type
num_trans_channel = 320
num_trans_head = 8
num_trans_layer = 1
num_proj_channel = 320
# task_scale_factor = num_trans_channel ** 0.5
self.task_embedding = nn.Parameter(torch.empty(self.num_control_type, num_trans_channel, dtype=self.dtype, device=device))
self.transformer_layes = nn.Sequential(*[ResBlockUnionControlnet(num_trans_channel, num_trans_head, dtype=self.dtype, device=device, operations=operations) for _ in range(num_trans_layer)])
self.spatial_ch_projs = operations.Linear(num_trans_channel, num_proj_channel, dtype=self.dtype, device=device)
#-----------------------------------------------------------------------------------------------------
control_add_embed_dim = 256
class ControlAddEmbedding(nn.Module):
def __init__(self, in_dim, out_dim, num_control_type, dtype=None, device=None, operations=None):
super().__init__()
self.num_control_type = num_control_type
self.in_dim = in_dim
self.linear_1 = operations.Linear(in_dim * num_control_type, out_dim, dtype=dtype, device=device)
self.linear_2 = operations.Linear(out_dim, out_dim, dtype=dtype, device=device)
def forward(self, control_type, dtype, device):
c_type = torch.zeros((self.num_control_type,), device=device)
c_type[control_type] = 1.0
c_type = timestep_embedding(c_type.flatten(), self.in_dim, repeat_only=False).to(dtype).reshape((-1, self.num_control_type * self.in_dim))
return self.linear_2(torch.nn.functional.silu(self.linear_1(c_type)))
self.control_add_embedding = ControlAddEmbedding(control_add_embed_dim, time_embed_dim, self.num_control_type, dtype=self.dtype, device=device, operations=operations)
else:
self.task_embedding = None
self.control_add_embedding = None
def union_controlnet_merge(self, hint, control_type, emb, context):
# Equivalent to: https://github.com/xinsir6/ControlNetPlus/tree/main
inputs = []
condition_list = []
for idx in range(min(1, len(control_type))):
controlnet_cond = self.input_hint_block(hint[idx], emb, context)
feat_seq = torch.mean(controlnet_cond, dim=(2, 3))
if idx < len(control_type):
feat_seq += self.task_embedding[control_type[idx]].to(dtype=feat_seq.dtype, device=feat_seq.device)
inputs.append(feat_seq.unsqueeze(1))
condition_list.append(controlnet_cond)
x = torch.cat(inputs, dim=1)
x = self.transformer_layes(x)
controlnet_cond_fuser = None
for idx in range(len(control_type)):
alpha = self.spatial_ch_projs(x[:, idx])
alpha = alpha.unsqueeze(-1).unsqueeze(-1)
o = condition_list[idx] + alpha
if controlnet_cond_fuser is None:
controlnet_cond_fuser = o
else:
controlnet_cond_fuser += o
return controlnet_cond_fuser
def make_zero_conv(self, channels, operations=None, dtype=None, device=None):
return TimestepEmbedSequential(operations.conv_nd(self.dims, channels, channels, 1, padding=0, dtype=dtype, device=device))
def forward(self, x, hint, timesteps, context, y=None, **kwargs):
t_emb = timestep_embedding(timesteps, self.model_channels, repeat_only=False).to(x.dtype)
emb = self.time_embed(t_emb)
guided_hint = None
if self.control_add_embedding is not None: #Union Controlnet
control_type = kwargs.get("control_type", [])
if any([c >= self.num_control_type for c in control_type]):
max_type = max(control_type)
max_type_name = {
v: k for k, v in UNION_CONTROLNET_TYPES.items()
}[max_type]
raise ValueError(
f"Control type {max_type_name}({max_type}) is out of range for the number of control types" +
f"({self.num_control_type}) supported.\n" +
"Please consider using the ProMax ControlNet Union model.\n" +
"https://huggingface.co/xinsir/controlnet-union-sdxl-1.0/tree/main"
)
emb += self.control_add_embedding(control_type, emb.dtype, emb.device)
if len(control_type) > 0:
if len(hint.shape) < 5:
hint = hint.unsqueeze(dim=0)
guided_hint = self.union_controlnet_merge(hint, control_type, emb, context)
if guided_hint is None:
guided_hint = self.input_hint_block(hint, emb, context)
out_output = []
out_middle = []
hs = []
if self.num_classes is not None:
assert y.shape[0] == x.shape[0]
emb = emb + self.label_emb(y)
h = x
for module, zero_conv in zip(self.input_blocks, self.zero_convs):
if guided_hint is not None:
h = module(h, emb, context)
h += guided_hint
guided_hint = None
else:
h = module(h, emb, context)
out_output.append(zero_conv(h, emb, context))
h = self.middle_block(h, emb, context)
out_middle.append(self.middle_block_out(h, emb, context))
return {"middle": out_middle, "output": out_output}

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comfy/cldm/control_types.py Normal file
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UNION_CONTROLNET_TYPES = {
"openpose": 0,
"depth": 1,
"hed/pidi/scribble/ted": 2,
"canny/lineart/anime_lineart/mlsd": 3,
"normal": 4,
"segment": 5,
"tile": 6,
"repaint": 7,
}

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comfy/cldm/mmdit.py Normal file
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import torch
from typing import Dict, Optional
import comfy.ldm.modules.diffusionmodules.mmdit
class ControlNet(comfy.ldm.modules.diffusionmodules.mmdit.MMDiT):
def __init__(
self,
num_blocks = None,
dtype = None,
device = None,
operations = None,
**kwargs,
):
super().__init__(dtype=dtype, device=device, operations=operations, final_layer=False, num_blocks=num_blocks, **kwargs)
# controlnet_blocks
self.controlnet_blocks = torch.nn.ModuleList([])
for _ in range(len(self.joint_blocks)):
self.controlnet_blocks.append(operations.Linear(self.hidden_size, self.hidden_size, device=device, dtype=dtype))
self.pos_embed_input = comfy.ldm.modules.diffusionmodules.mmdit.PatchEmbed(
None,
self.patch_size,
self.in_channels,
self.hidden_size,
bias=True,
strict_img_size=False,
dtype=dtype,
device=device,
operations=operations
)
def forward(
self,
x: torch.Tensor,
timesteps: torch.Tensor,
y: Optional[torch.Tensor] = None,
context: Optional[torch.Tensor] = None,
hint = None,
) -> torch.Tensor:
#weird sd3 controlnet specific stuff
y = torch.zeros_like(y)
if self.context_processor is not None:
context = self.context_processor(context)
hw = x.shape[-2:]
x = self.x_embedder(x) + self.cropped_pos_embed(hw, device=x.device).to(dtype=x.dtype, device=x.device)
x += self.pos_embed_input(hint)
c = self.t_embedder(timesteps, dtype=x.dtype)
if y is not None and self.y_embedder is not None:
y = self.y_embedder(y)
c = c + y
if context is not None:
context = self.context_embedder(context)
output = []
blocks = len(self.joint_blocks)
for i in range(blocks):
context, x = self.joint_blocks[i](
context,
x,
c=c,
use_checkpoint=self.use_checkpoint,
)
out = self.controlnet_blocks[i](x)
count = self.depth // blocks
if i == blocks - 1:
count -= 1
for j in range(count):
output.append(out)
return {"output": output}

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comfy/cli_args.py Normal file
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import argparse
import enum
import os
from typing import Optional
import comfy.options
class EnumAction(argparse.Action):
"""
Argparse action for handling Enums
"""
def __init__(self, **kwargs):
# Pop off the type value
enum_type = kwargs.pop("type", None)
# Ensure an Enum subclass is provided
if enum_type is None:
raise ValueError("type must be assigned an Enum when using EnumAction")
if not issubclass(enum_type, enum.Enum):
raise TypeError("type must be an Enum when using EnumAction")
# Generate choices from the Enum
choices = tuple(e.value for e in enum_type)
kwargs.setdefault("choices", choices)
kwargs.setdefault("metavar", f"[{','.join(list(choices))}]")
super(EnumAction, self).__init__(**kwargs)
self._enum = enum_type
def __call__(self, parser, namespace, values, option_string=None):
# Convert value back into an Enum
value = self._enum(values)
setattr(namespace, self.dest, value)
parser = argparse.ArgumentParser()
parser.add_argument("--listen", type=str, default="127.0.0.1", metavar="IP", nargs="?", const="0.0.0.0", help="Specify the IP address to listen on (default: 127.0.0.1). If --listen is provided without an argument, it defaults to 0.0.0.0. (listens on all)")
parser.add_argument("--port", type=int, default=8188, help="Set the listen port.")
parser.add_argument("--tls-keyfile", type=str, help="Path to TLS (SSL) key file. Enables TLS, makes app accessible at https://... requires --tls-certfile to function")
parser.add_argument("--tls-certfile", type=str, help="Path to TLS (SSL) certificate file. Enables TLS, makes app accessible at https://... requires --tls-keyfile to function")
parser.add_argument("--enable-cors-header", type=str, default=None, metavar="ORIGIN", nargs="?", const="*", help="Enable CORS (Cross-Origin Resource Sharing) with optional origin or allow all with default '*'.")
parser.add_argument("--max-upload-size", type=float, default=100, help="Set the maximum upload size in MB.")
parser.add_argument("--extra-model-paths-config", type=str, default=None, metavar="PATH", nargs='+', action='append', help="Load one or more extra_model_paths.yaml files.")
parser.add_argument("--output-directory", type=str, default=None, help="Set the ComfyUI output directory.")
parser.add_argument("--temp-directory", type=str, default=None, help="Set the ComfyUI temp directory (default is in the ComfyUI directory).")
parser.add_argument("--input-directory", type=str, default=None, help="Set the ComfyUI input directory.")
parser.add_argument("--auto-launch", action="store_true", help="Automatically launch ComfyUI in the default browser.")
parser.add_argument("--disable-auto-launch", action="store_true", help="Disable auto launching the browser.")
parser.add_argument("--cuda-device", type=int, default=None, metavar="DEVICE_ID", help="Set the id of the cuda device this instance will use.")
cm_group = parser.add_mutually_exclusive_group()
cm_group.add_argument("--cuda-malloc", action="store_true", help="Enable cudaMallocAsync (enabled by default for torch 2.0 and up).")
cm_group.add_argument("--disable-cuda-malloc", action="store_true", help="Disable cudaMallocAsync.")
fp_group = parser.add_mutually_exclusive_group()
fp_group.add_argument("--force-fp32", action="store_true", help="Force fp32 (If this makes your GPU work better please report it).")
fp_group.add_argument("--force-fp16", action="store_true", help="Force fp16.")
fpunet_group = parser.add_mutually_exclusive_group()
fpunet_group.add_argument("--bf16-unet", action="store_true", help="Run the UNET in bf16. This should only be used for testing stuff.")
fpunet_group.add_argument("--fp16-unet", action="store_true", help="Store unet weights in fp16.")
fpunet_group.add_argument("--fp8_e4m3fn-unet", action="store_true", help="Store unet weights in fp8_e4m3fn.")
fpunet_group.add_argument("--fp8_e5m2-unet", action="store_true", help="Store unet weights in fp8_e5m2.")
fpvae_group = parser.add_mutually_exclusive_group()
fpvae_group.add_argument("--fp16-vae", action="store_true", help="Run the VAE in fp16, might cause black images.")
fpvae_group.add_argument("--fp32-vae", action="store_true", help="Run the VAE in full precision fp32.")
fpvae_group.add_argument("--bf16-vae", action="store_true", help="Run the VAE in bf16.")
parser.add_argument("--cpu-vae", action="store_true", help="Run the VAE on the CPU.")
fpte_group = parser.add_mutually_exclusive_group()
fpte_group.add_argument("--fp8_e4m3fn-text-enc", action="store_true", help="Store text encoder weights in fp8 (e4m3fn variant).")
fpte_group.add_argument("--fp8_e5m2-text-enc", action="store_true", help="Store text encoder weights in fp8 (e5m2 variant).")
fpte_group.add_argument("--fp16-text-enc", action="store_true", help="Store text encoder weights in fp16.")
fpte_group.add_argument("--fp32-text-enc", action="store_true", help="Store text encoder weights in fp32.")
parser.add_argument("--force-channels-last", action="store_true", help="Force channels last format when inferencing the models.")
parser.add_argument("--directml", type=int, nargs="?", metavar="DIRECTML_DEVICE", const=-1, help="Use torch-directml.")
parser.add_argument("--disable-ipex-optimize", action="store_true", help="Disables ipex.optimize when loading models with Intel GPUs.")
class LatentPreviewMethod(enum.Enum):
NoPreviews = "none"
Auto = "auto"
Latent2RGB = "latent2rgb"
TAESD = "taesd"
parser.add_argument("--preview-method", type=LatentPreviewMethod, default=LatentPreviewMethod.NoPreviews, help="Default preview method for sampler nodes.", action=EnumAction)
attn_group = parser.add_mutually_exclusive_group()
attn_group.add_argument("--use-split-cross-attention", action="store_true", help="Use the split cross attention optimization. Ignored when xformers is used.")
attn_group.add_argument("--use-quad-cross-attention", action="store_true", help="Use the sub-quadratic cross attention optimization . Ignored when xformers is used.")
attn_group.add_argument("--use-pytorch-cross-attention", action="store_true", help="Use the new pytorch 2.0 cross attention function.")
parser.add_argument("--disable-xformers", action="store_true", help="Disable xformers.")
upcast = parser.add_mutually_exclusive_group()
upcast.add_argument("--force-upcast-attention", action="store_true", help="Force enable attention upcasting, please report if it fixes black images.")
upcast.add_argument("--dont-upcast-attention", action="store_true", help="Disable all upcasting of attention. Should be unnecessary except for debugging.")
vram_group = parser.add_mutually_exclusive_group()
vram_group.add_argument("--gpu-only", action="store_true", help="Store and run everything (text encoders/CLIP models, etc... on the GPU).")
vram_group.add_argument("--highvram", action="store_true", help="By default models will be unloaded to CPU memory after being used. This option keeps them in GPU memory.")
vram_group.add_argument("--normalvram", action="store_true", help="Used to force normal vram use if lowvram gets automatically enabled.")
vram_group.add_argument("--lowvram", action="store_true", help="Split the unet in parts to use less vram.")
vram_group.add_argument("--novram", action="store_true", help="When lowvram isn't enough.")
vram_group.add_argument("--cpu", action="store_true", help="To use the CPU for everything (slow).")
parser.add_argument("--default-hashing-function", type=str, choices=['md5', 'sha1', 'sha256', 'sha512'], default='sha256', help="Allows you to choose the hash function to use for duplicate filename / contents comparison. Default is sha256.")
parser.add_argument("--disable-smart-memory", action="store_true", help="Force ComfyUI to agressively offload to regular ram instead of keeping models in vram when it can.")
parser.add_argument("--deterministic", action="store_true", help="Make pytorch use slower deterministic algorithms when it can. Note that this might not make images deterministic in all cases.")
parser.add_argument("--dont-print-server", action="store_true", help="Don't print server output.")
parser.add_argument("--quick-test-for-ci", action="store_true", help="Quick test for CI.")
parser.add_argument("--windows-standalone-build", action="store_true", help="Windows standalone build: Enable convenient things that most people using the standalone windows build will probably enjoy (like auto opening the page on startup).")
parser.add_argument("--disable-metadata", action="store_true", help="Disable saving prompt metadata in files.")
parser.add_argument("--disable-all-custom-nodes", action="store_true", help="Disable loading all custom nodes.")
parser.add_argument("--multi-user", action="store_true", help="Enables per-user storage.")
parser.add_argument("--verbose", action="store_true", help="Enables more debug prints.")
# The default built-in provider hosted under web/
DEFAULT_VERSION_STRING = "comfyanonymous/ComfyUI@latest"
parser.add_argument(
"--front-end-version",
type=str,
default=DEFAULT_VERSION_STRING,
help="""
Specifies the version of the frontend to be used. This command needs internet connectivity to query and
download available frontend implementations from GitHub releases.
The version string should be in the format of:
[repoOwner]/[repoName]@[version]
where version is one of: "latest" or a valid version number (e.g. "1.0.0")
""",
)
def is_valid_directory(path: Optional[str]) -> Optional[str]:
"""Validate if the given path is a directory."""
if path is None:
return None
if not os.path.isdir(path):
raise argparse.ArgumentTypeError(f"{path} is not a valid directory.")
return path
parser.add_argument(
"--front-end-root",
type=is_valid_directory,
default=None,
help="The local filesystem path to the directory where the frontend is located. Overrides --front-end-version.",
)
if comfy.options.args_parsing:
args = parser.parse_args()
else:
args = parser.parse_args([])
if args.windows_standalone_build:
args.auto_launch = True
if args.disable_auto_launch:
args.auto_launch = False
import logging
logging_level = logging.INFO
if args.verbose:
logging_level = logging.DEBUG
logging.basicConfig(format="%(message)s", level=logging_level)

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comfy/clip_config_bigg.json Normal file
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{
"architectures": [
"CLIPTextModel"
],
"attention_dropout": 0.0,
"bos_token_id": 0,
"dropout": 0.0,
"eos_token_id": 49407,
"hidden_act": "gelu",
"hidden_size": 1280,
"initializer_factor": 1.0,
"initializer_range": 0.02,
"intermediate_size": 5120,
"layer_norm_eps": 1e-05,
"max_position_embeddings": 77,
"model_type": "clip_text_model",
"num_attention_heads": 20,
"num_hidden_layers": 32,
"pad_token_id": 1,
"projection_dim": 1280,
"torch_dtype": "float32",
"vocab_size": 49408
}

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import torch
from comfy.ldm.modules.attention import optimized_attention_for_device
import comfy.ops
class CLIPAttention(torch.nn.Module):
def __init__(self, embed_dim, heads, dtype, device, operations):
super().__init__()
self.heads = heads
self.q_proj = operations.Linear(embed_dim, embed_dim, bias=True, dtype=dtype, device=device)
self.k_proj = operations.Linear(embed_dim, embed_dim, bias=True, dtype=dtype, device=device)
self.v_proj = operations.Linear(embed_dim, embed_dim, bias=True, dtype=dtype, device=device)
self.out_proj = operations.Linear(embed_dim, embed_dim, bias=True, dtype=dtype, device=device)
def forward(self, x, mask=None, optimized_attention=None):
q = self.q_proj(x)
k = self.k_proj(x)
v = self.v_proj(x)
out = optimized_attention(q, k, v, self.heads, mask)
return self.out_proj(out)
ACTIVATIONS = {"quick_gelu": lambda a: a * torch.sigmoid(1.702 * a),
"gelu": torch.nn.functional.gelu,
}
class CLIPMLP(torch.nn.Module):
def __init__(self, embed_dim, intermediate_size, activation, dtype, device, operations):
super().__init__()
self.fc1 = operations.Linear(embed_dim, intermediate_size, bias=True, dtype=dtype, device=device)
self.activation = ACTIVATIONS[activation]
self.fc2 = operations.Linear(intermediate_size, embed_dim, bias=True, dtype=dtype, device=device)
def forward(self, x):
x = self.fc1(x)
x = self.activation(x)
x = self.fc2(x)
return x
class CLIPLayer(torch.nn.Module):
def __init__(self, embed_dim, heads, intermediate_size, intermediate_activation, dtype, device, operations):
super().__init__()
self.layer_norm1 = operations.LayerNorm(embed_dim, dtype=dtype, device=device)
self.self_attn = CLIPAttention(embed_dim, heads, dtype, device, operations)
self.layer_norm2 = operations.LayerNorm(embed_dim, dtype=dtype, device=device)
self.mlp = CLIPMLP(embed_dim, intermediate_size, intermediate_activation, dtype, device, operations)
def forward(self, x, mask=None, optimized_attention=None):
x += self.self_attn(self.layer_norm1(x), mask, optimized_attention)
x += self.mlp(self.layer_norm2(x))
return x
class CLIPEncoder(torch.nn.Module):
def __init__(self, num_layers, embed_dim, heads, intermediate_size, intermediate_activation, dtype, device, operations):
super().__init__()
self.layers = torch.nn.ModuleList([CLIPLayer(embed_dim, heads, intermediate_size, intermediate_activation, dtype, device, operations) for i in range(num_layers)])
def forward(self, x, mask=None, intermediate_output=None):
optimized_attention = optimized_attention_for_device(x.device, mask=mask is not None, small_input=True)
if intermediate_output is not None:
if intermediate_output < 0:
intermediate_output = len(self.layers) + intermediate_output
intermediate = None
for i, l in enumerate(self.layers):
x = l(x, mask, optimized_attention)
if i == intermediate_output:
intermediate = x.clone()
return x, intermediate
class CLIPEmbeddings(torch.nn.Module):
def __init__(self, embed_dim, vocab_size=49408, num_positions=77, dtype=None, device=None, operations=None):
super().__init__()
self.token_embedding = operations.Embedding(vocab_size, embed_dim, dtype=dtype, device=device)
self.position_embedding = operations.Embedding(num_positions, embed_dim, dtype=dtype, device=device)
def forward(self, input_tokens, dtype=torch.float32):
return self.token_embedding(input_tokens, out_dtype=dtype) + comfy.ops.cast_to(self.position_embedding.weight, dtype=dtype, device=input_tokens.device)
class CLIPTextModel_(torch.nn.Module):
def __init__(self, config_dict, dtype, device, operations):
num_layers = config_dict["num_hidden_layers"]
embed_dim = config_dict["hidden_size"]
heads = config_dict["num_attention_heads"]
intermediate_size = config_dict["intermediate_size"]
intermediate_activation = config_dict["hidden_act"]
self.eos_token_id = config_dict["eos_token_id"]
super().__init__()
self.embeddings = CLIPEmbeddings(embed_dim, dtype=dtype, device=device, operations=operations)
self.encoder = CLIPEncoder(num_layers, embed_dim, heads, intermediate_size, intermediate_activation, dtype, device, operations)
self.final_layer_norm = operations.LayerNorm(embed_dim, dtype=dtype, device=device)
def forward(self, input_tokens, attention_mask=None, intermediate_output=None, final_layer_norm_intermediate=True, dtype=torch.float32):
x = self.embeddings(input_tokens, dtype=dtype)
mask = None
if attention_mask is not None:
mask = 1.0 - attention_mask.to(x.dtype).reshape((attention_mask.shape[0], 1, -1, attention_mask.shape[-1])).expand(attention_mask.shape[0], 1, attention_mask.shape[-1], attention_mask.shape[-1])
mask = mask.masked_fill(mask.to(torch.bool), float("-inf"))
causal_mask = torch.empty(x.shape[1], x.shape[1], dtype=x.dtype, device=x.device).fill_(float("-inf")).triu_(1)
if mask is not None:
mask += causal_mask
else:
mask = causal_mask
x, i = self.encoder(x, mask=mask, intermediate_output=intermediate_output)
x = self.final_layer_norm(x)
if i is not None and final_layer_norm_intermediate:
i = self.final_layer_norm(i)
pooled_output = x[torch.arange(x.shape[0], device=x.device), (torch.round(input_tokens).to(dtype=torch.int, device=x.device) == self.eos_token_id).int().argmax(dim=-1),]
return x, i, pooled_output
class CLIPTextModel(torch.nn.Module):
def __init__(self, config_dict, dtype, device, operations):
super().__init__()
self.num_layers = config_dict["num_hidden_layers"]
self.text_model = CLIPTextModel_(config_dict, dtype, device, operations)
embed_dim = config_dict["hidden_size"]
self.text_projection = operations.Linear(embed_dim, embed_dim, bias=False, dtype=dtype, device=device)
self.text_projection.weight.copy_(torch.eye(embed_dim))
self.dtype = dtype
def get_input_embeddings(self):
return self.text_model.embeddings.token_embedding
def set_input_embeddings(self, embeddings):
self.text_model.embeddings.token_embedding = embeddings
def forward(self, *args, **kwargs):
x = self.text_model(*args, **kwargs)
out = self.text_projection(x[2])
return (x[0], x[1], out, x[2])
class CLIPVisionEmbeddings(torch.nn.Module):
def __init__(self, embed_dim, num_channels=3, patch_size=14, image_size=224, dtype=None, device=None, operations=None):
super().__init__()
self.class_embedding = torch.nn.Parameter(torch.empty(embed_dim, dtype=dtype, device=device))
self.patch_embedding = operations.Conv2d(
in_channels=num_channels,
out_channels=embed_dim,
kernel_size=patch_size,
stride=patch_size,
bias=False,
dtype=dtype,
device=device
)
num_patches = (image_size // patch_size) ** 2
num_positions = num_patches + 1
self.position_embedding = operations.Embedding(num_positions, embed_dim, dtype=dtype, device=device)
def forward(self, pixel_values):
embeds = self.patch_embedding(pixel_values).flatten(2).transpose(1, 2)
return torch.cat([comfy.ops.cast_to_input(self.class_embedding, embeds).expand(pixel_values.shape[0], 1, -1), embeds], dim=1) + comfy.ops.cast_to_input(self.position_embedding.weight, embeds)
class CLIPVision(torch.nn.Module):
def __init__(self, config_dict, dtype, device, operations):
super().__init__()
num_layers = config_dict["num_hidden_layers"]
embed_dim = config_dict["hidden_size"]
heads = config_dict["num_attention_heads"]
intermediate_size = config_dict["intermediate_size"]
intermediate_activation = config_dict["hidden_act"]
self.embeddings = CLIPVisionEmbeddings(embed_dim, config_dict["num_channels"], config_dict["patch_size"], config_dict["image_size"], dtype=dtype, device=device, operations=operations)
self.pre_layrnorm = operations.LayerNorm(embed_dim)
self.encoder = CLIPEncoder(num_layers, embed_dim, heads, intermediate_size, intermediate_activation, dtype, device, operations)
self.post_layernorm = operations.LayerNorm(embed_dim)
def forward(self, pixel_values, attention_mask=None, intermediate_output=None):
x = self.embeddings(pixel_values)
x = self.pre_layrnorm(x)
#TODO: attention_mask?
x, i = self.encoder(x, mask=None, intermediate_output=intermediate_output)
pooled_output = self.post_layernorm(x[:, 0, :])
return x, i, pooled_output
class CLIPVisionModelProjection(torch.nn.Module):
def __init__(self, config_dict, dtype, device, operations):
super().__init__()
self.vision_model = CLIPVision(config_dict, dtype, device, operations)
self.visual_projection = operations.Linear(config_dict["hidden_size"], config_dict["projection_dim"], bias=False)
def forward(self, *args, **kwargs):
x = self.vision_model(*args, **kwargs)
out = self.visual_projection(x[2])
return (x[0], x[1], out)

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from .utils import load_torch_file, transformers_convert, state_dict_prefix_replace
import os
import torch
import json
import logging
import comfy.ops
import comfy.model_patcher
import comfy.model_management
import comfy.utils
import comfy.clip_model
class Output:
def __getitem__(self, key):
return getattr(self, key)
def __setitem__(self, key, item):
setattr(self, key, item)
def clip_preprocess(image, size=224):
mean = torch.tensor([ 0.48145466,0.4578275,0.40821073], device=image.device, dtype=image.dtype)
std = torch.tensor([0.26862954,0.26130258,0.27577711], device=image.device, dtype=image.dtype)
image = image.movedim(-1, 1)
if not (image.shape[2] == size and image.shape[3] == size):
scale = (size / min(image.shape[2], image.shape[3]))
image = torch.nn.functional.interpolate(image, size=(round(scale * image.shape[2]), round(scale * image.shape[3])), mode="bicubic", antialias=True)
h = (image.shape[2] - size)//2
w = (image.shape[3] - size)//2
image = image[:,:,h:h+size,w:w+size]
image = torch.clip((255. * image), 0, 255).round() / 255.0
return (image - mean.view([3,1,1])) / std.view([3,1,1])
class ClipVisionModel():
def __init__(self, json_config):
with open(json_config) as f:
config = json.load(f)
self.image_size = config.get("image_size", 224)
self.load_device = comfy.model_management.text_encoder_device()
offload_device = comfy.model_management.text_encoder_offload_device()
self.dtype = comfy.model_management.text_encoder_dtype(self.load_device)
self.model = comfy.clip_model.CLIPVisionModelProjection(config, self.dtype, offload_device, comfy.ops.manual_cast)
self.model.eval()
self.patcher = comfy.model_patcher.ModelPatcher(self.model, load_device=self.load_device, offload_device=offload_device)
def load_sd(self, sd):
return self.model.load_state_dict(sd, strict=False)
def get_sd(self):
return self.model.state_dict()
def encode_image(self, image):
comfy.model_management.load_model_gpu(self.patcher)
pixel_values = clip_preprocess(image.to(self.load_device), size=self.image_size).float()
out = self.model(pixel_values=pixel_values, intermediate_output=-2)
outputs = Output()
outputs["last_hidden_state"] = out[0].to(comfy.model_management.intermediate_device())
outputs["image_embeds"] = out[2].to(comfy.model_management.intermediate_device())
outputs["penultimate_hidden_states"] = out[1].to(comfy.model_management.intermediate_device())
return outputs
def convert_to_transformers(sd, prefix):
sd_k = sd.keys()
if "{}transformer.resblocks.0.attn.in_proj_weight".format(prefix) in sd_k:
keys_to_replace = {
"{}class_embedding".format(prefix): "vision_model.embeddings.class_embedding",
"{}conv1.weight".format(prefix): "vision_model.embeddings.patch_embedding.weight",
"{}positional_embedding".format(prefix): "vision_model.embeddings.position_embedding.weight",
"{}ln_post.bias".format(prefix): "vision_model.post_layernorm.bias",
"{}ln_post.weight".format(prefix): "vision_model.post_layernorm.weight",
"{}ln_pre.bias".format(prefix): "vision_model.pre_layrnorm.bias",
"{}ln_pre.weight".format(prefix): "vision_model.pre_layrnorm.weight",
}
for x in keys_to_replace:
if x in sd_k:
sd[keys_to_replace[x]] = sd.pop(x)
if "{}proj".format(prefix) in sd_k:
sd['visual_projection.weight'] = sd.pop("{}proj".format(prefix)).transpose(0, 1)
sd = transformers_convert(sd, prefix, "vision_model.", 48)
else:
replace_prefix = {prefix: ""}
sd = state_dict_prefix_replace(sd, replace_prefix)
return sd
def load_clipvision_from_sd(sd, prefix="", convert_keys=False):
if convert_keys:
sd = convert_to_transformers(sd, prefix)
if "vision_model.encoder.layers.47.layer_norm1.weight" in sd:
json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "clip_vision_config_g.json")
elif "vision_model.encoder.layers.30.layer_norm1.weight" in sd:
json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "clip_vision_config_h.json")
elif "vision_model.encoder.layers.22.layer_norm1.weight" in sd:
if sd["vision_model.embeddings.position_embedding.weight"].shape[0] == 577:
json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "clip_vision_config_vitl_336.json")
else:
json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "clip_vision_config_vitl.json")
else:
return None
clip = ClipVisionModel(json_config)
m, u = clip.load_sd(sd)
if len(m) > 0:
logging.warning("missing clip vision: {}".format(m))
u = set(u)
keys = list(sd.keys())
for k in keys:
if k not in u:
t = sd.pop(k)
del t
return clip
def load(ckpt_path):
sd = load_torch_file(ckpt_path)
if "visual.transformer.resblocks.0.attn.in_proj_weight" in sd:
return load_clipvision_from_sd(sd, prefix="visual.", convert_keys=True)
else:
return load_clipvision_from_sd(sd)

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comfy/clip_vision_config_g.json Normal file
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{
"attention_dropout": 0.0,
"dropout": 0.0,
"hidden_act": "gelu",
"hidden_size": 1664,
"image_size": 224,
"initializer_factor": 1.0,
"initializer_range": 0.02,
"intermediate_size": 8192,
"layer_norm_eps": 1e-05,
"model_type": "clip_vision_model",
"num_attention_heads": 16,
"num_channels": 3,
"num_hidden_layers": 48,
"patch_size": 14,
"projection_dim": 1280,
"torch_dtype": "float32"
}

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comfy/clip_vision_config_h.json Normal file
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{
"attention_dropout": 0.0,
"dropout": 0.0,
"hidden_act": "gelu",
"hidden_size": 1280,
"image_size": 224,
"initializer_factor": 1.0,
"initializer_range": 0.02,
"intermediate_size": 5120,
"layer_norm_eps": 1e-05,
"model_type": "clip_vision_model",
"num_attention_heads": 16,
"num_channels": 3,
"num_hidden_layers": 32,
"patch_size": 14,
"projection_dim": 1024,
"torch_dtype": "float32"
}

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comfy/clip_vision_config_vitl.json Normal file
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{
"attention_dropout": 0.0,
"dropout": 0.0,
"hidden_act": "quick_gelu",
"hidden_size": 1024,
"image_size": 224,
"initializer_factor": 1.0,
"initializer_range": 0.02,
"intermediate_size": 4096,
"layer_norm_eps": 1e-05,
"model_type": "clip_vision_model",
"num_attention_heads": 16,
"num_channels": 3,
"num_hidden_layers": 24,
"patch_size": 14,
"projection_dim": 768,
"torch_dtype": "float32"
}

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comfy/clip_vision_config_vitl_336.json Normal file
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{
"attention_dropout": 0.0,
"dropout": 0.0,
"hidden_act": "quick_gelu",
"hidden_size": 1024,
"image_size": 336,
"initializer_factor": 1.0,
"initializer_range": 0.02,
"intermediate_size": 4096,
"layer_norm_eps": 1e-5,
"model_type": "clip_vision_model",
"num_attention_heads": 16,
"num_channels": 3,
"num_hidden_layers": 24,
"patch_size": 14,
"projection_dim": 768,
"torch_dtype": "float32"
}

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comfy/conds.py Normal file
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import torch
import math
import comfy.utils
def lcm(a, b): #TODO: eventually replace by math.lcm (added in python3.9)
return abs(a*b) // math.gcd(a, b)
class CONDRegular:
def __init__(self, cond):
self.cond = cond
def _copy_with(self, cond):
return self.__class__(cond)
def process_cond(self, batch_size, device, **kwargs):
return self._copy_with(comfy.utils.repeat_to_batch_size(self.cond, batch_size).to(device))
def can_concat(self, other):
if self.cond.shape != other.cond.shape:
return False
return True
def concat(self, others):
conds = [self.cond]
for x in others:
conds.append(x.cond)
return torch.cat(conds)
class CONDNoiseShape(CONDRegular):
def process_cond(self, batch_size, device, area, **kwargs):
data = self.cond
if area is not None:
dims = len(area) // 2
for i in range(dims):
data = data.narrow(i + 2, area[i + dims], area[i])
return self._copy_with(comfy.utils.repeat_to_batch_size(data, batch_size).to(device))
class CONDCrossAttn(CONDRegular):
def can_concat(self, other):
s1 = self.cond.shape
s2 = other.cond.shape
if s1 != s2:
if s1[0] != s2[0] or s1[2] != s2[2]: #these 2 cases should not happen
return False
mult_min = lcm(s1[1], s2[1])
diff = mult_min // min(s1[1], s2[1])
if diff > 4: #arbitrary limit on the padding because it's probably going to impact performance negatively if it's too much
return False
return True
def concat(self, others):
conds = [self.cond]
crossattn_max_len = self.cond.shape[1]
for x in others:
c = x.cond
crossattn_max_len = lcm(crossattn_max_len, c.shape[1])
conds.append(c)
out = []
for c in conds:
if c.shape[1] < crossattn_max_len:
c = c.repeat(1, crossattn_max_len // c.shape[1], 1) #padding with repeat doesn't change result
out.append(c)
return torch.cat(out)
class CONDConstant(CONDRegular):
def __init__(self, cond):
self.cond = cond
def process_cond(self, batch_size, device, **kwargs):
return self._copy_with(self.cond)
def can_concat(self, other):
if self.cond != other.cond:
return False
return True
def concat(self, others):
return self.cond

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comfy/controlnet.py Normal file
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import torch
import math
import os
import logging
import comfy.utils
import comfy.model_management
import comfy.model_detection
import comfy.model_patcher
import comfy.ops
import comfy.latent_formats
import comfy.cldm.cldm
import comfy.t2i_adapter.adapter
import comfy.ldm.cascade.controlnet
import comfy.cldm.mmdit
def broadcast_image_to(tensor, target_batch_size, batched_number):
current_batch_size = tensor.shape[0]
#print(current_batch_size, target_batch_size)
if current_batch_size == 1:
return tensor
per_batch = target_batch_size // batched_number
tensor = tensor[:per_batch]
if per_batch > tensor.shape[0]:
tensor = torch.cat([tensor] * (per_batch // tensor.shape[0]) + [tensor[:(per_batch % tensor.shape[0])]], dim=0)
current_batch_size = tensor.shape[0]
if current_batch_size == target_batch_size:
return tensor
else:
return torch.cat([tensor] * batched_number, dim=0)
class ControlBase:
def __init__(self, device=None):
self.cond_hint_original = None
self.cond_hint = None
self.strength = 1.0
self.timestep_percent_range = (0.0, 1.0)
self.latent_format = None
self.vae = None
self.global_average_pooling = False
self.timestep_range = None
self.compression_ratio = 8
self.upscale_algorithm = 'nearest-exact'
self.extra_args = {}
if device is None:
device = comfy.model_management.get_torch_device()
self.device = device
self.previous_controlnet = None
def set_cond_hint(self, cond_hint, strength=1.0, timestep_percent_range=(0.0, 1.0), vae=None):
self.cond_hint_original = cond_hint
self.strength = strength
self.timestep_percent_range = timestep_percent_range
if self.latent_format is not None:
self.vae = vae
return self
def pre_run(self, model, percent_to_timestep_function):
self.timestep_range = (percent_to_timestep_function(self.timestep_percent_range[0]), percent_to_timestep_function(self.timestep_percent_range[1]))
if self.previous_controlnet is not None:
self.previous_controlnet.pre_run(model, percent_to_timestep_function)
def set_previous_controlnet(self, controlnet):
self.previous_controlnet = controlnet
return self
def cleanup(self):
if self.previous_controlnet is not None:
self.previous_controlnet.cleanup()
if self.cond_hint is not None:
del self.cond_hint
self.cond_hint = None
self.timestep_range = None
def get_models(self):
out = []
if self.previous_controlnet is not None:
out += self.previous_controlnet.get_models()
return out
def copy_to(self, c):
c.cond_hint_original = self.cond_hint_original
c.strength = self.strength
c.timestep_percent_range = self.timestep_percent_range
c.global_average_pooling = self.global_average_pooling
c.compression_ratio = self.compression_ratio
c.upscale_algorithm = self.upscale_algorithm
c.latent_format = self.latent_format
c.extra_args = self.extra_args.copy()
c.vae = self.vae
def inference_memory_requirements(self, dtype):
if self.previous_controlnet is not None:
return self.previous_controlnet.inference_memory_requirements(dtype)
return 0
def control_merge(self, control, control_prev, output_dtype):
out = {'input':[], 'middle':[], 'output': []}
for key in control:
control_output = control[key]
applied_to = set()
for i in range(len(control_output)):
x = control_output[i]
if x is not None:
if self.global_average_pooling:
x = torch.mean(x, dim=(2, 3), keepdim=True).repeat(1, 1, x.shape[2], x.shape[3])
if x not in applied_to: #memory saving strategy, allow shared tensors and only apply strength to shared tensors once
applied_to.add(x)
x *= self.strength
if x.dtype != output_dtype:
x = x.to(output_dtype)
out[key].append(x)
if control_prev is not None:
for x in ['input', 'middle', 'output']:
o = out[x]
for i in range(len(control_prev[x])):
prev_val = control_prev[x][i]
if i >= len(o):
o.append(prev_val)
elif prev_val is not None:
if o[i] is None:
o[i] = prev_val
else:
if o[i].shape[0] < prev_val.shape[0]:
o[i] = prev_val + o[i]
else:
o[i] = prev_val + o[i] #TODO: change back to inplace add if shared tensors stop being an issue
return out
def set_extra_arg(self, argument, value=None):
self.extra_args[argument] = value
class ControlNet(ControlBase):
def __init__(self, control_model=None, global_average_pooling=False, compression_ratio=8, latent_format=None, device=None, load_device=None, manual_cast_dtype=None):
super().__init__(device)
self.control_model = control_model
self.load_device = load_device
if control_model is not None:
self.control_model_wrapped = comfy.model_patcher.ModelPatcher(self.control_model, load_device=load_device, offload_device=comfy.model_management.unet_offload_device())
self.compression_ratio = compression_ratio
self.global_average_pooling = global_average_pooling
self.model_sampling_current = None
self.manual_cast_dtype = manual_cast_dtype
self.latent_format = latent_format
def get_control(self, x_noisy, t, cond, batched_number):
control_prev = None
if self.previous_controlnet is not None:
control_prev = self.previous_controlnet.get_control(x_noisy, t, cond, batched_number)
if self.timestep_range is not None:
if t[0] > self.timestep_range[0] or t[0] < self.timestep_range[1]:
if control_prev is not None:
return control_prev
else:
return None
dtype = self.control_model.dtype
if self.manual_cast_dtype is not None:
dtype = self.manual_cast_dtype
output_dtype = x_noisy.dtype
if self.cond_hint is None or x_noisy.shape[2] * self.compression_ratio != self.cond_hint.shape[2] or x_noisy.shape[3] * self.compression_ratio != self.cond_hint.shape[3]:
if self.cond_hint is not None:
del self.cond_hint
self.cond_hint = None
compression_ratio = self.compression_ratio
if self.vae is not None:
compression_ratio *= self.vae.downscale_ratio
self.cond_hint = comfy.utils.common_upscale(self.cond_hint_original, x_noisy.shape[3] * compression_ratio, x_noisy.shape[2] * compression_ratio, self.upscale_algorithm, "center")
if self.vae is not None:
loaded_models = comfy.model_management.loaded_models(only_currently_used=True)
self.cond_hint = self.vae.encode(self.cond_hint.movedim(1, -1))
comfy.model_management.load_models_gpu(loaded_models)
if self.latent_format is not None:
self.cond_hint = self.latent_format.process_in(self.cond_hint)
self.cond_hint = self.cond_hint.to(device=self.device, dtype=dtype)
if x_noisy.shape[0] != self.cond_hint.shape[0]:
self.cond_hint = broadcast_image_to(self.cond_hint, x_noisy.shape[0], batched_number)
context = cond.get('crossattn_controlnet', cond['c_crossattn'])
y = cond.get('y', None)
if y is not None:
y = y.to(dtype)
timestep = self.model_sampling_current.timestep(t)
x_noisy = self.model_sampling_current.calculate_input(t, x_noisy)
control = self.control_model(x=x_noisy.to(dtype), hint=self.cond_hint, timesteps=timestep.float(), context=context.to(dtype), y=y, **self.extra_args)
return self.control_merge(control, control_prev, output_dtype)
def copy(self):
c = ControlNet(None, global_average_pooling=self.global_average_pooling, load_device=self.load_device, manual_cast_dtype=self.manual_cast_dtype)
c.control_model = self.control_model
c.control_model_wrapped = self.control_model_wrapped
self.copy_to(c)
return c
def get_models(self):
out = super().get_models()
out.append(self.control_model_wrapped)
return out
def pre_run(self, model, percent_to_timestep_function):
super().pre_run(model, percent_to_timestep_function)
self.model_sampling_current = model.model_sampling
def cleanup(self):
self.model_sampling_current = None
super().cleanup()
class ControlLoraOps:
class Linear(torch.nn.Module, comfy.ops.CastWeightBiasOp):
def __init__(self, in_features: int, out_features: int, bias: bool = True,
device=None, dtype=None) -> None:
factory_kwargs = {'device': device, 'dtype': dtype}
super().__init__()
self.in_features = in_features
self.out_features = out_features
self.weight = None
self.up = None
self.down = None
self.bias = None
def forward(self, input):
weight, bias = comfy.ops.cast_bias_weight(self, input)
if self.up is not None:
return torch.nn.functional.linear(input, weight + (torch.mm(self.up.flatten(start_dim=1), self.down.flatten(start_dim=1))).reshape(self.weight.shape).type(input.dtype), bias)
else:
return torch.nn.functional.linear(input, weight, bias)
class Conv2d(torch.nn.Module, comfy.ops.CastWeightBiasOp):
def __init__(
self,
in_channels,
out_channels,
kernel_size,
stride=1,
padding=0,
dilation=1,
groups=1,
bias=True,
padding_mode='zeros',
device=None,
dtype=None
):
super().__init__()
self.in_channels = in_channels
self.out_channels = out_channels
self.kernel_size = kernel_size
self.stride = stride
self.padding = padding
self.dilation = dilation
self.transposed = False
self.output_padding = 0
self.groups = groups
self.padding_mode = padding_mode
self.weight = None
self.bias = None
self.up = None
self.down = None
def forward(self, input):
weight, bias = comfy.ops.cast_bias_weight(self, input)
if self.up is not None:
return torch.nn.functional.conv2d(input, weight + (torch.mm(self.up.flatten(start_dim=1), self.down.flatten(start_dim=1))).reshape(self.weight.shape).type(input.dtype), bias, self.stride, self.padding, self.dilation, self.groups)
else:
return torch.nn.functional.conv2d(input, weight, bias, self.stride, self.padding, self.dilation, self.groups)
class ControlLora(ControlNet):
def __init__(self, control_weights, global_average_pooling=False, device=None):
ControlBase.__init__(self, device)
self.control_weights = control_weights
self.global_average_pooling = global_average_pooling
def pre_run(self, model, percent_to_timestep_function):
super().pre_run(model, percent_to_timestep_function)
controlnet_config = model.model_config.unet_config.copy()
controlnet_config.pop("out_channels")
controlnet_config["hint_channels"] = self.control_weights["input_hint_block.0.weight"].shape[1]
self.manual_cast_dtype = model.manual_cast_dtype
dtype = model.get_dtype()
if self.manual_cast_dtype is None:
class control_lora_ops(ControlLoraOps, comfy.ops.disable_weight_init):
pass
else:
class control_lora_ops(ControlLoraOps, comfy.ops.manual_cast):
pass
dtype = self.manual_cast_dtype
controlnet_config["operations"] = control_lora_ops
controlnet_config["dtype"] = dtype
self.control_model = comfy.cldm.cldm.ControlNet(**controlnet_config)
self.control_model.to(comfy.model_management.get_torch_device())
diffusion_model = model.diffusion_model
sd = diffusion_model.state_dict()
cm = self.control_model.state_dict()
for k in sd:
weight = sd[k]
try:
comfy.utils.set_attr_param(self.control_model, k, weight)
except:
pass
for k in self.control_weights:
if k not in {"lora_controlnet"}:
comfy.utils.set_attr_param(self.control_model, k, self.control_weights[k].to(dtype).to(comfy.model_management.get_torch_device()))
def copy(self):
c = ControlLora(self.control_weights, global_average_pooling=self.global_average_pooling)
self.copy_to(c)
return c
def cleanup(self):
del self.control_model
self.control_model = None
super().cleanup()
def get_models(self):
out = ControlBase.get_models(self)
return out
def inference_memory_requirements(self, dtype):
return comfy.utils.calculate_parameters(self.control_weights) * comfy.model_management.dtype_size(dtype) + ControlBase.inference_memory_requirements(self, dtype)
def load_controlnet_mmdit(sd):
new_sd = comfy.model_detection.convert_diffusers_mmdit(sd, "")
model_config = comfy.model_detection.model_config_from_unet(new_sd, "", True)
num_blocks = comfy.model_detection.count_blocks(new_sd, 'joint_blocks.{}.')
for k in sd:
new_sd[k] = sd[k]
supported_inference_dtypes = model_config.supported_inference_dtypes
controlnet_config = model_config.unet_config
unet_dtype = comfy.model_management.unet_dtype(supported_dtypes=supported_inference_dtypes)
load_device = comfy.model_management.get_torch_device()
manual_cast_dtype = comfy.model_management.unet_manual_cast(unet_dtype, load_device)
if manual_cast_dtype is not None:
operations = comfy.ops.manual_cast
else:
operations = comfy.ops.disable_weight_init
control_model = comfy.cldm.mmdit.ControlNet(num_blocks=num_blocks, operations=operations, device=load_device, dtype=unet_dtype, **controlnet_config)
missing, unexpected = control_model.load_state_dict(new_sd, strict=False)
if len(missing) > 0:
logging.warning("missing controlnet keys: {}".format(missing))
if len(unexpected) > 0:
logging.debug("unexpected controlnet keys: {}".format(unexpected))
latent_format = comfy.latent_formats.SD3()
latent_format.shift_factor = 0 #SD3 controlnet weirdness
control = ControlNet(control_model, compression_ratio=1, latent_format=latent_format, load_device=load_device, manual_cast_dtype=manual_cast_dtype)
return control
def load_controlnet(ckpt_path, model=None):
controlnet_data = comfy.utils.load_torch_file(ckpt_path, safe_load=True)
if "lora_controlnet" in controlnet_data:
return ControlLora(controlnet_data)
controlnet_config = None
supported_inference_dtypes = None
if "controlnet_cond_embedding.conv_in.weight" in controlnet_data: #diffusers format
controlnet_config = comfy.model_detection.unet_config_from_diffusers_unet(controlnet_data)
diffusers_keys = comfy.utils.unet_to_diffusers(controlnet_config)
diffusers_keys["controlnet_mid_block.weight"] = "middle_block_out.0.weight"
diffusers_keys["controlnet_mid_block.bias"] = "middle_block_out.0.bias"
count = 0
loop = True
while loop:
suffix = [".weight", ".bias"]
for s in suffix:
k_in = "controlnet_down_blocks.{}{}".format(count, s)
k_out = "zero_convs.{}.0{}".format(count, s)
if k_in not in controlnet_data:
loop = False
break
diffusers_keys[k_in] = k_out
count += 1
count = 0
loop = True
while loop:
suffix = [".weight", ".bias"]
for s in suffix:
if count == 0:
k_in = "controlnet_cond_embedding.conv_in{}".format(s)
else:
k_in = "controlnet_cond_embedding.blocks.{}{}".format(count - 1, s)
k_out = "input_hint_block.{}{}".format(count * 2, s)
if k_in not in controlnet_data:
k_in = "controlnet_cond_embedding.conv_out{}".format(s)
loop = False
diffusers_keys[k_in] = k_out
count += 1
new_sd = {}
for k in diffusers_keys:
if k in controlnet_data:
new_sd[diffusers_keys[k]] = controlnet_data.pop(k)
if "control_add_embedding.linear_1.bias" in controlnet_data: #Union Controlnet
controlnet_config["union_controlnet_num_control_type"] = controlnet_data["task_embedding"].shape[0]
for k in list(controlnet_data.keys()):
new_k = k.replace('.attn.in_proj_', '.attn.in_proj.')
new_sd[new_k] = controlnet_data.pop(k)
leftover_keys = controlnet_data.keys()
if len(leftover_keys) > 0:
logging.warning("leftover keys: {}".format(leftover_keys))
controlnet_data = new_sd
elif "controlnet_blocks.0.weight" in controlnet_data: #SD3 diffusers format
return load_controlnet_mmdit(controlnet_data)
pth_key = 'control_model.zero_convs.0.0.weight'
pth = False
key = 'zero_convs.0.0.weight'
if pth_key in controlnet_data:
pth = True
key = pth_key
prefix = "control_model."
elif key in controlnet_data:
prefix = ""
else:
net = load_t2i_adapter(controlnet_data)
if net is None:
logging.error("error checkpoint does not contain controlnet or t2i adapter data {}".format(ckpt_path))
return net
if controlnet_config is None:
model_config = comfy.model_detection.model_config_from_unet(controlnet_data, prefix, True)
supported_inference_dtypes = model_config.supported_inference_dtypes
controlnet_config = model_config.unet_config
load_device = comfy.model_management.get_torch_device()
if supported_inference_dtypes is None:
unet_dtype = comfy.model_management.unet_dtype()
else:
unet_dtype = comfy.model_management.unet_dtype(supported_dtypes=supported_inference_dtypes)
manual_cast_dtype = comfy.model_management.unet_manual_cast(unet_dtype, load_device)
if manual_cast_dtype is not None:
controlnet_config["operations"] = comfy.ops.manual_cast
controlnet_config["dtype"] = unet_dtype
controlnet_config.pop("out_channels")
controlnet_config["hint_channels"] = controlnet_data["{}input_hint_block.0.weight".format(prefix)].shape[1]
control_model = comfy.cldm.cldm.ControlNet(**controlnet_config)
if pth:
if 'difference' in controlnet_data:
if model is not None:
comfy.model_management.load_models_gpu([model])
model_sd = model.model_state_dict()
for x in controlnet_data:
c_m = "control_model."
if x.startswith(c_m):
sd_key = "diffusion_model.{}".format(x[len(c_m):])
if sd_key in model_sd:
cd = controlnet_data[x]
cd += model_sd[sd_key].type(cd.dtype).to(cd.device)
else:
logging.warning("WARNING: Loaded a diff controlnet without a model. It will very likely not work.")
class WeightsLoader(torch.nn.Module):
pass
w = WeightsLoader()
w.control_model = control_model
missing, unexpected = w.load_state_dict(controlnet_data, strict=False)
else:
missing, unexpected = control_model.load_state_dict(controlnet_data, strict=False)
if len(missing) > 0:
logging.warning("missing controlnet keys: {}".format(missing))
if len(unexpected) > 0:
logging.debug("unexpected controlnet keys: {}".format(unexpected))
global_average_pooling = False
filename = os.path.splitext(ckpt_path)[0]
if filename.endswith("_shuffle") or filename.endswith("_shuffle_fp16"): #TODO: smarter way of enabling global_average_pooling
global_average_pooling = True
control = ControlNet(control_model, global_average_pooling=global_average_pooling, load_device=load_device, manual_cast_dtype=manual_cast_dtype)
return control
class T2IAdapter(ControlBase):
def __init__(self, t2i_model, channels_in, compression_ratio, upscale_algorithm, device=None):
super().__init__(device)
self.t2i_model = t2i_model
self.channels_in = channels_in
self.control_input = None
self.compression_ratio = compression_ratio
self.upscale_algorithm = upscale_algorithm
def scale_image_to(self, width, height):
unshuffle_amount = self.t2i_model.unshuffle_amount
width = math.ceil(width / unshuffle_amount) * unshuffle_amount
height = math.ceil(height / unshuffle_amount) * unshuffle_amount
return width, height
def get_control(self, x_noisy, t, cond, batched_number):
control_prev = None
if self.previous_controlnet is not None:
control_prev = self.previous_controlnet.get_control(x_noisy, t, cond, batched_number)
if self.timestep_range is not None:
if t[0] > self.timestep_range[0] or t[0] < self.timestep_range[1]:
if control_prev is not None:
return control_prev
else:
return None
if self.cond_hint is None or x_noisy.shape[2] * self.compression_ratio != self.cond_hint.shape[2] or x_noisy.shape[3] * self.compression_ratio != self.cond_hint.shape[3]:
if self.cond_hint is not None:
del self.cond_hint
self.control_input = None
self.cond_hint = None
width, height = self.scale_image_to(x_noisy.shape[3] * self.compression_ratio, x_noisy.shape[2] * self.compression_ratio)
self.cond_hint = comfy.utils.common_upscale(self.cond_hint_original, width, height, self.upscale_algorithm, "center").float().to(self.device)
if self.channels_in == 1 and self.cond_hint.shape[1] > 1:
self.cond_hint = torch.mean(self.cond_hint, 1, keepdim=True)
if x_noisy.shape[0] != self.cond_hint.shape[0]:
self.cond_hint = broadcast_image_to(self.cond_hint, x_noisy.shape[0], batched_number)
if self.control_input is None:
self.t2i_model.to(x_noisy.dtype)
self.t2i_model.to(self.device)
self.control_input = self.t2i_model(self.cond_hint.to(x_noisy.dtype))
self.t2i_model.cpu()
control_input = {}
for k in self.control_input:
control_input[k] = list(map(lambda a: None if a is None else a.clone(), self.control_input[k]))
return self.control_merge(control_input, control_prev, x_noisy.dtype)
def copy(self):
c = T2IAdapter(self.t2i_model, self.channels_in, self.compression_ratio, self.upscale_algorithm)
self.copy_to(c)
return c
def load_t2i_adapter(t2i_data):
compression_ratio = 8
upscale_algorithm = 'nearest-exact'
if 'adapter' in t2i_data:
t2i_data = t2i_data['adapter']
if 'adapter.body.0.resnets.0.block1.weight' in t2i_data: #diffusers format
prefix_replace = {}
for i in range(4):
for j in range(2):
prefix_replace["adapter.body.{}.resnets.{}.".format(i, j)] = "body.{}.".format(i * 2 + j)
prefix_replace["adapter.body.{}.".format(i, j)] = "body.{}.".format(i * 2)
prefix_replace["adapter."] = ""
t2i_data = comfy.utils.state_dict_prefix_replace(t2i_data, prefix_replace)
keys = t2i_data.keys()
if "body.0.in_conv.weight" in keys:
cin = t2i_data['body.0.in_conv.weight'].shape[1]
model_ad = comfy.t2i_adapter.adapter.Adapter_light(cin=cin, channels=[320, 640, 1280, 1280], nums_rb=4)
elif 'conv_in.weight' in keys:
cin = t2i_data['conv_in.weight'].shape[1]
channel = t2i_data['conv_in.weight'].shape[0]
ksize = t2i_data['body.0.block2.weight'].shape[2]
use_conv = False
down_opts = list(filter(lambda a: a.endswith("down_opt.op.weight"), keys))
if len(down_opts) > 0:
use_conv = True
xl = False
if cin == 256 or cin == 768:
xl = True
model_ad = comfy.t2i_adapter.adapter.Adapter(cin=cin, channels=[channel, channel*2, channel*4, channel*4][:4], nums_rb=2, ksize=ksize, sk=True, use_conv=use_conv, xl=xl)
elif "backbone.0.0.weight" in keys:
model_ad = comfy.ldm.cascade.controlnet.ControlNet(c_in=t2i_data['backbone.0.0.weight'].shape[1], proj_blocks=[0, 4, 8, 12, 51, 55, 59, 63])
compression_ratio = 32
upscale_algorithm = 'bilinear'
elif "backbone.10.blocks.0.weight" in keys:
model_ad = comfy.ldm.cascade.controlnet.ControlNet(c_in=t2i_data['backbone.0.weight'].shape[1], bottleneck_mode="large", proj_blocks=[0, 4, 8, 12, 51, 55, 59, 63])
compression_ratio = 1
upscale_algorithm = 'nearest-exact'
else:
return None
missing, unexpected = model_ad.load_state_dict(t2i_data)
if len(missing) > 0:
logging.warning("t2i missing {}".format(missing))
if len(unexpected) > 0:
logging.debug("t2i unexpected {}".format(unexpected))
return T2IAdapter(model_ad, model_ad.input_channels, compression_ratio, upscale_algorithm)

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import re
import torch
import logging
# conversion code from https://github.com/huggingface/diffusers/blob/main/scripts/convert_diffusers_to_original_stable_diffusion.py
# =================#
# UNet Conversion #
# =================#
unet_conversion_map = [
# (stable-diffusion, HF Diffusers)
("time_embed.0.weight", "time_embedding.linear_1.weight"),
("time_embed.0.bias", "time_embedding.linear_1.bias"),
("time_embed.2.weight", "time_embedding.linear_2.weight"),
("time_embed.2.bias", "time_embedding.linear_2.bias"),
("input_blocks.0.0.weight", "conv_in.weight"),
("input_blocks.0.0.bias", "conv_in.bias"),
("out.0.weight", "conv_norm_out.weight"),
("out.0.bias", "conv_norm_out.bias"),
("out.2.weight", "conv_out.weight"),
("out.2.bias", "conv_out.bias"),
]
unet_conversion_map_resnet = [
# (stable-diffusion, HF Diffusers)
("in_layers.0", "norm1"),
("in_layers.2", "conv1"),
("out_layers.0", "norm2"),
("out_layers.3", "conv2"),
("emb_layers.1", "time_emb_proj"),
("skip_connection", "conv_shortcut"),
]
unet_conversion_map_layer = []
# hardcoded number of downblocks and resnets/attentions...
# would need smarter logic for other networks.
for i in range(4):
# loop over downblocks/upblocks
for j in range(2):
# loop over resnets/attentions for downblocks
hf_down_res_prefix = f"down_blocks.{i}.resnets.{j}."
sd_down_res_prefix = f"input_blocks.{3 * i + j + 1}.0."
unet_conversion_map_layer.append((sd_down_res_prefix, hf_down_res_prefix))
if i < 3:
# no attention layers in down_blocks.3
hf_down_atn_prefix = f"down_blocks.{i}.attentions.{j}."
sd_down_atn_prefix = f"input_blocks.{3 * i + j + 1}.1."
unet_conversion_map_layer.append((sd_down_atn_prefix, hf_down_atn_prefix))
for j in range(3):
# loop over resnets/attentions for upblocks
hf_up_res_prefix = f"up_blocks.{i}.resnets.{j}."
sd_up_res_prefix = f"output_blocks.{3 * i + j}.0."
unet_conversion_map_layer.append((sd_up_res_prefix, hf_up_res_prefix))
if i > 0:
# no attention layers in up_blocks.0
hf_up_atn_prefix = f"up_blocks.{i}.attentions.{j}."
sd_up_atn_prefix = f"output_blocks.{3 * i + j}.1."
unet_conversion_map_layer.append((sd_up_atn_prefix, hf_up_atn_prefix))
if i < 3:
# no downsample in down_blocks.3
hf_downsample_prefix = f"down_blocks.{i}.downsamplers.0.conv."
sd_downsample_prefix = f"input_blocks.{3 * (i + 1)}.0.op."
unet_conversion_map_layer.append((sd_downsample_prefix, hf_downsample_prefix))
# no upsample in up_blocks.3
hf_upsample_prefix = f"up_blocks.{i}.upsamplers.0."
sd_upsample_prefix = f"output_blocks.{3 * i + 2}.{1 if i == 0 else 2}."
unet_conversion_map_layer.append((sd_upsample_prefix, hf_upsample_prefix))
hf_mid_atn_prefix = "mid_block.attentions.0."
sd_mid_atn_prefix = "middle_block.1."
unet_conversion_map_layer.append((sd_mid_atn_prefix, hf_mid_atn_prefix))
for j in range(2):
hf_mid_res_prefix = f"mid_block.resnets.{j}."
sd_mid_res_prefix = f"middle_block.{2 * j}."
unet_conversion_map_layer.append((sd_mid_res_prefix, hf_mid_res_prefix))
def convert_unet_state_dict(unet_state_dict):
# buyer beware: this is a *brittle* function,
# and correct output requires that all of these pieces interact in
# the exact order in which I have arranged them.
mapping = {k: k for k in unet_state_dict.keys()}
for sd_name, hf_name in unet_conversion_map:
mapping[hf_name] = sd_name
for k, v in mapping.items():
if "resnets" in k:
for sd_part, hf_part in unet_conversion_map_resnet:
v = v.replace(hf_part, sd_part)
mapping[k] = v
for k, v in mapping.items():
for sd_part, hf_part in unet_conversion_map_layer:
v = v.replace(hf_part, sd_part)
mapping[k] = v
new_state_dict = {v: unet_state_dict[k] for k, v in mapping.items()}
return new_state_dict
# ================#
# VAE Conversion #
# ================#
vae_conversion_map = [
# (stable-diffusion, HF Diffusers)
("nin_shortcut", "conv_shortcut"),
("norm_out", "conv_norm_out"),
("mid.attn_1.", "mid_block.attentions.0."),
]
for i in range(4):
# down_blocks have two resnets
for j in range(2):
hf_down_prefix = f"encoder.down_blocks.{i}.resnets.{j}."
sd_down_prefix = f"encoder.down.{i}.block.{j}."
vae_conversion_map.append((sd_down_prefix, hf_down_prefix))
if i < 3:
hf_downsample_prefix = f"down_blocks.{i}.downsamplers.0."
sd_downsample_prefix = f"down.{i}.downsample."
vae_conversion_map.append((sd_downsample_prefix, hf_downsample_prefix))
hf_upsample_prefix = f"up_blocks.{i}.upsamplers.0."
sd_upsample_prefix = f"up.{3 - i}.upsample."
vae_conversion_map.append((sd_upsample_prefix, hf_upsample_prefix))
# up_blocks have three resnets
# also, up blocks in hf are numbered in reverse from sd
for j in range(3):
hf_up_prefix = f"decoder.up_blocks.{i}.resnets.{j}."
sd_up_prefix = f"decoder.up.{3 - i}.block.{j}."
vae_conversion_map.append((sd_up_prefix, hf_up_prefix))
# this part accounts for mid blocks in both the encoder and the decoder
for i in range(2):
hf_mid_res_prefix = f"mid_block.resnets.{i}."
sd_mid_res_prefix = f"mid.block_{i + 1}."
vae_conversion_map.append((sd_mid_res_prefix, hf_mid_res_prefix))
vae_conversion_map_attn = [
# (stable-diffusion, HF Diffusers)
("norm.", "group_norm."),
("q.", "query."),
("k.", "key."),
("v.", "value."),
("q.", "to_q."),
("k.", "to_k."),
("v.", "to_v."),
("proj_out.", "to_out.0."),
("proj_out.", "proj_attn."),
]
def reshape_weight_for_sd(w):
# convert HF linear weights to SD conv2d weights
return w.reshape(*w.shape, 1, 1)
def convert_vae_state_dict(vae_state_dict):
mapping = {k: k for k in vae_state_dict.keys()}
for k, v in mapping.items():
for sd_part, hf_part in vae_conversion_map:
v = v.replace(hf_part, sd_part)
mapping[k] = v
for k, v in mapping.items():
if "attentions" in k:
for sd_part, hf_part in vae_conversion_map_attn:
v = v.replace(hf_part, sd_part)
mapping[k] = v
new_state_dict = {v: vae_state_dict[k] for k, v in mapping.items()}
weights_to_convert = ["q", "k", "v", "proj_out"]
for k, v in new_state_dict.items():
for weight_name in weights_to_convert:
if f"mid.attn_1.{weight_name}.weight" in k:
logging.debug(f"Reshaping {k} for SD format")
new_state_dict[k] = reshape_weight_for_sd(v)
return new_state_dict
# =========================#
# Text Encoder Conversion #
# =========================#
textenc_conversion_lst = [
# (stable-diffusion, HF Diffusers)
("resblocks.", "text_model.encoder.layers."),
("ln_1", "layer_norm1"),
("ln_2", "layer_norm2"),
(".c_fc.", ".fc1."),
(".c_proj.", ".fc2."),
(".attn", ".self_attn"),
("ln_final.", "transformer.text_model.final_layer_norm."),
("token_embedding.weight", "transformer.text_model.embeddings.token_embedding.weight"),
("positional_embedding", "transformer.text_model.embeddings.position_embedding.weight"),
]
protected = {re.escape(x[1]): x[0] for x in textenc_conversion_lst}
textenc_pattern = re.compile("|".join(protected.keys()))
# Ordering is from https://github.com/pytorch/pytorch/blob/master/test/cpp/api/modules.cpp
code2idx = {"q": 0, "k": 1, "v": 2}
# This function exists because at the time of writing torch.cat can't do fp8 with cuda
def cat_tensors(tensors):
x = 0
for t in tensors:
x += t.shape[0]
shape = [x] + list(tensors[0].shape)[1:]
out = torch.empty(shape, device=tensors[0].device, dtype=tensors[0].dtype)
x = 0
for t in tensors:
out[x:x + t.shape[0]] = t
x += t.shape[0]
return out
def convert_text_enc_state_dict_v20(text_enc_dict, prefix=""):
new_state_dict = {}
capture_qkv_weight = {}
capture_qkv_bias = {}
for k, v in text_enc_dict.items():
if not k.startswith(prefix):
continue
if (
k.endswith(".self_attn.q_proj.weight")
or k.endswith(".self_attn.k_proj.weight")
or k.endswith(".self_attn.v_proj.weight")
):
k_pre = k[: -len(".q_proj.weight")]
k_code = k[-len("q_proj.weight")]
if k_pre not in capture_qkv_weight:
capture_qkv_weight[k_pre] = [None, None, None]
capture_qkv_weight[k_pre][code2idx[k_code]] = v
continue
if (
k.endswith(".self_attn.q_proj.bias")
or k.endswith(".self_attn.k_proj.bias")
or k.endswith(".self_attn.v_proj.bias")
):
k_pre = k[: -len(".q_proj.bias")]
k_code = k[-len("q_proj.bias")]
if k_pre not in capture_qkv_bias:
capture_qkv_bias[k_pre] = [None, None, None]
capture_qkv_bias[k_pre][code2idx[k_code]] = v
continue
text_proj = "transformer.text_projection.weight"
if k.endswith(text_proj):
new_state_dict[k.replace(text_proj, "text_projection")] = v.transpose(0, 1).contiguous()
else:
relabelled_key = textenc_pattern.sub(lambda m: protected[re.escape(m.group(0))], k)
new_state_dict[relabelled_key] = v
for k_pre, tensors in capture_qkv_weight.items():
if None in tensors:
raise Exception("CORRUPTED MODEL: one of the q-k-v values for the text encoder was missing")
relabelled_key = textenc_pattern.sub(lambda m: protected[re.escape(m.group(0))], k_pre)
new_state_dict[relabelled_key + ".in_proj_weight"] = cat_tensors(tensors)
for k_pre, tensors in capture_qkv_bias.items():
if None in tensors:
raise Exception("CORRUPTED MODEL: one of the q-k-v values for the text encoder was missing")
relabelled_key = textenc_pattern.sub(lambda m: protected[re.escape(m.group(0))], k_pre)
new_state_dict[relabelled_key + ".in_proj_bias"] = cat_tensors(tensors)
return new_state_dict
def convert_text_enc_state_dict(text_enc_dict):
return text_enc_dict

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import os
import comfy.sd
def first_file(path, filenames):
for f in filenames:
p = os.path.join(path, f)
if os.path.exists(p):
return p
return None
def load_diffusers(model_path, output_vae=True, output_clip=True, embedding_directory=None):
diffusion_model_names = ["diffusion_pytorch_model.fp16.safetensors", "diffusion_pytorch_model.safetensors", "diffusion_pytorch_model.fp16.bin", "diffusion_pytorch_model.bin"]
unet_path = first_file(os.path.join(model_path, "unet"), diffusion_model_names)
vae_path = first_file(os.path.join(model_path, "vae"), diffusion_model_names)
text_encoder_model_names = ["model.fp16.safetensors", "model.safetensors", "pytorch_model.fp16.bin", "pytorch_model.bin"]
text_encoder1_path = first_file(os.path.join(model_path, "text_encoder"), text_encoder_model_names)
text_encoder2_path = first_file(os.path.join(model_path, "text_encoder_2"), text_encoder_model_names)
text_encoder_paths = [text_encoder1_path]
if text_encoder2_path is not None:
text_encoder_paths.append(text_encoder2_path)
unet = comfy.sd.load_unet(unet_path)
clip = None
if output_clip:
clip = comfy.sd.load_clip(text_encoder_paths, embedding_directory=embedding_directory)
vae = None
if output_vae:
sd = comfy.utils.load_torch_file(vae_path)
vae = comfy.sd.VAE(sd=sd)
return (unet, clip, vae)

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#code taken from: https://github.com/wl-zhao/UniPC and modified
import torch
import torch.nn.functional as F
import math
from tqdm.auto import trange, tqdm
class NoiseScheduleVP:
def __init__(
self,
schedule='discrete',
betas=None,
alphas_cumprod=None,
continuous_beta_0=0.1,
continuous_beta_1=20.,
):
"""Create a wrapper class for the forward SDE (VP type).
***
Update: We support discrete-time diffusion models by implementing a picewise linear interpolation for log_alpha_t.
We recommend to use schedule='discrete' for the discrete-time diffusion models, especially for high-resolution images.
***
The forward SDE ensures that the condition distribution q_{t|0}(x_t | x_0) = N ( alpha_t * x_0, sigma_t^2 * I ).
We further define lambda_t = log(alpha_t) - log(sigma_t), which is the half-logSNR (described in the DPM-Solver paper).
Therefore, we implement the functions for computing alpha_t, sigma_t and lambda_t. For t in [0, T], we have:
log_alpha_t = self.marginal_log_mean_coeff(t)
sigma_t = self.marginal_std(t)
lambda_t = self.marginal_lambda(t)
Moreover, as lambda(t) is an invertible function, we also support its inverse function:
t = self.inverse_lambda(lambda_t)
===============================================================
We support both discrete-time DPMs (trained on n = 0, 1, ..., N-1) and continuous-time DPMs (trained on t in [t_0, T]).
1. For discrete-time DPMs:
For discrete-time DPMs trained on n = 0, 1, ..., N-1, we convert the discrete steps to continuous time steps by:
t_i = (i + 1) / N
e.g. for N = 1000, we have t_0 = 1e-3 and T = t_{N-1} = 1.
We solve the corresponding diffusion ODE from time T = 1 to time t_0 = 1e-3.
Args:
betas: A `torch.Tensor`. The beta array for the discrete-time DPM. (See the original DDPM paper for details)
alphas_cumprod: A `torch.Tensor`. The cumprod alphas for the discrete-time DPM. (See the original DDPM paper for details)
Note that we always have alphas_cumprod = cumprod(betas). Therefore, we only need to set one of `betas` and `alphas_cumprod`.
**Important**: Please pay special attention for the args for `alphas_cumprod`:
The `alphas_cumprod` is the \hat{alpha_n} arrays in the notations of DDPM. Specifically, DDPMs assume that
q_{t_n | 0}(x_{t_n} | x_0) = N ( \sqrt{\hat{alpha_n}} * x_0, (1 - \hat{alpha_n}) * I ).
Therefore, the notation \hat{alpha_n} is different from the notation alpha_t in DPM-Solver. In fact, we have
alpha_{t_n} = \sqrt{\hat{alpha_n}},
and
log(alpha_{t_n}) = 0.5 * log(\hat{alpha_n}).
2. For continuous-time DPMs:
We support two types of VPSDEs: linear (DDPM) and cosine (improved-DDPM). The hyperparameters for the noise
schedule are the default settings in DDPM and improved-DDPM:
Args:
beta_min: A `float` number. The smallest beta for the linear schedule.
beta_max: A `float` number. The largest beta for the linear schedule.
cosine_s: A `float` number. The hyperparameter in the cosine schedule.
cosine_beta_max: A `float` number. The hyperparameter in the cosine schedule.
T: A `float` number. The ending time of the forward process.
===============================================================
Args:
schedule: A `str`. The noise schedule of the forward SDE. 'discrete' for discrete-time DPMs,
'linear' or 'cosine' for continuous-time DPMs.
Returns:
A wrapper object of the forward SDE (VP type).
===============================================================
Example:
# For discrete-time DPMs, given betas (the beta array for n = 0, 1, ..., N - 1):
>>> ns = NoiseScheduleVP('discrete', betas=betas)
# For discrete-time DPMs, given alphas_cumprod (the \hat{alpha_n} array for n = 0, 1, ..., N - 1):
>>> ns = NoiseScheduleVP('discrete', alphas_cumprod=alphas_cumprod)
# For continuous-time DPMs (VPSDE), linear schedule:
>>> ns = NoiseScheduleVP('linear', continuous_beta_0=0.1, continuous_beta_1=20.)
"""
if schedule not in ['discrete', 'linear', 'cosine']:
raise ValueError("Unsupported noise schedule {}. The schedule needs to be 'discrete' or 'linear' or 'cosine'".format(schedule))
self.schedule = schedule
if schedule == 'discrete':
if betas is not None:
log_alphas = 0.5 * torch.log(1 - betas).cumsum(dim=0)
else:
assert alphas_cumprod is not None
log_alphas = 0.5 * torch.log(alphas_cumprod)
self.total_N = len(log_alphas)
self.T = 1.
self.t_array = torch.linspace(0., 1., self.total_N + 1)[1:].reshape((1, -1))
self.log_alpha_array = log_alphas.reshape((1, -1,))
else:
self.total_N = 1000
self.beta_0 = continuous_beta_0
self.beta_1 = continuous_beta_1
self.cosine_s = 0.008
self.cosine_beta_max = 999.
self.cosine_t_max = math.atan(self.cosine_beta_max * (1. + self.cosine_s) / math.pi) * 2. * (1. + self.cosine_s) / math.pi - self.cosine_s
self.cosine_log_alpha_0 = math.log(math.cos(self.cosine_s / (1. + self.cosine_s) * math.pi / 2.))
self.schedule = schedule
if schedule == 'cosine':
# For the cosine schedule, T = 1 will have numerical issues. So we manually set the ending time T.
# Note that T = 0.9946 may be not the optimal setting. However, we find it works well.
self.T = 0.9946
else:
self.T = 1.
def marginal_log_mean_coeff(self, t):
"""
Compute log(alpha_t) of a given continuous-time label t in [0, T].
"""
if self.schedule == 'discrete':
return interpolate_fn(t.reshape((-1, 1)), self.t_array.to(t.device), self.log_alpha_array.to(t.device)).reshape((-1))
elif self.schedule == 'linear':
return -0.25 * t ** 2 * (self.beta_1 - self.beta_0) - 0.5 * t * self.beta_0
elif self.schedule == 'cosine':
log_alpha_fn = lambda s: torch.log(torch.cos((s + self.cosine_s) / (1. + self.cosine_s) * math.pi / 2.))
log_alpha_t = log_alpha_fn(t) - self.cosine_log_alpha_0
return log_alpha_t
def marginal_alpha(self, t):
"""
Compute alpha_t of a given continuous-time label t in [0, T].
"""
return torch.exp(self.marginal_log_mean_coeff(t))
def marginal_std(self, t):
"""
Compute sigma_t of a given continuous-time label t in [0, T].
"""
return torch.sqrt(1. - torch.exp(2. * self.marginal_log_mean_coeff(t)))
def marginal_lambda(self, t):
"""
Compute lambda_t = log(alpha_t) - log(sigma_t) of a given continuous-time label t in [0, T].
"""
log_mean_coeff = self.marginal_log_mean_coeff(t)
log_std = 0.5 * torch.log(1. - torch.exp(2. * log_mean_coeff))
return log_mean_coeff - log_std
def inverse_lambda(self, lamb):
"""
Compute the continuous-time label t in [0, T] of a given half-logSNR lambda_t.
"""
if self.schedule == 'linear':
tmp = 2. * (self.beta_1 - self.beta_0) * torch.logaddexp(-2. * lamb, torch.zeros((1,)).to(lamb))
Delta = self.beta_0**2 + tmp
return tmp / (torch.sqrt(Delta) + self.beta_0) / (self.beta_1 - self.beta_0)
elif self.schedule == 'discrete':
log_alpha = -0.5 * torch.logaddexp(torch.zeros((1,)).to(lamb.device), -2. * lamb)
t = interpolate_fn(log_alpha.reshape((-1, 1)), torch.flip(self.log_alpha_array.to(lamb.device), [1]), torch.flip(self.t_array.to(lamb.device), [1]))
return t.reshape((-1,))
else:
log_alpha = -0.5 * torch.logaddexp(-2. * lamb, torch.zeros((1,)).to(lamb))
t_fn = lambda log_alpha_t: torch.arccos(torch.exp(log_alpha_t + self.cosine_log_alpha_0)) * 2. * (1. + self.cosine_s) / math.pi - self.cosine_s
t = t_fn(log_alpha)
return t
def model_wrapper(
model,
noise_schedule,
model_type="noise",
model_kwargs={},
guidance_type="uncond",
condition=None,
unconditional_condition=None,
guidance_scale=1.,
classifier_fn=None,
classifier_kwargs={},
):
"""Create a wrapper function for the noise prediction model.
DPM-Solver needs to solve the continuous-time diffusion ODEs. For DPMs trained on discrete-time labels, we need to
firstly wrap the model function to a noise prediction model that accepts the continuous time as the input.
We support four types of the diffusion model by setting `model_type`:
1. "noise": noise prediction model. (Trained by predicting noise).
2. "x_start": data prediction model. (Trained by predicting the data x_0 at time 0).
3. "v": velocity prediction model. (Trained by predicting the velocity).
The "v" prediction is derivation detailed in Appendix D of [1], and is used in Imagen-Video [2].
[1] Salimans, Tim, and Jonathan Ho. "Progressive distillation for fast sampling of diffusion models."
arXiv preprint arXiv:2202.00512 (2022).
[2] Ho, Jonathan, et al. "Imagen Video: High Definition Video Generation with Diffusion Models."
arXiv preprint arXiv:2210.02303 (2022).
4. "score": marginal score function. (Trained by denoising score matching).
Note that the score function and the noise prediction model follows a simple relationship:
```
noise(x_t, t) = -sigma_t * score(x_t, t)
```
We support three types of guided sampling by DPMs by setting `guidance_type`:
1. "uncond": unconditional sampling by DPMs.
The input `model` has the following format:
``
model(x, t_input, **model_kwargs) -> noise | x_start | v | score
``
2. "classifier": classifier guidance sampling [3] by DPMs and another classifier.
The input `model` has the following format:
``
model(x, t_input, **model_kwargs) -> noise | x_start | v | score
``
The input `classifier_fn` has the following format:
``
classifier_fn(x, t_input, cond, **classifier_kwargs) -> logits(x, t_input, cond)
``
[3] P. Dhariwal and A. Q. Nichol, "Diffusion models beat GANs on image synthesis,"
in Advances in Neural Information Processing Systems, vol. 34, 2021, pp. 8780-8794.
3. "classifier-free": classifier-free guidance sampling by conditional DPMs.
The input `model` has the following format:
``
model(x, t_input, cond, **model_kwargs) -> noise | x_start | v | score
``
And if cond == `unconditional_condition`, the model output is the unconditional DPM output.
[4] Ho, Jonathan, and Tim Salimans. "Classifier-free diffusion guidance."
arXiv preprint arXiv:2207.12598 (2022).
The `t_input` is the time label of the model, which may be discrete-time labels (i.e. 0 to 999)
or continuous-time labels (i.e. epsilon to T).
We wrap the model function to accept only `x` and `t_continuous` as inputs, and outputs the predicted noise:
``
def model_fn(x, t_continuous) -> noise:
t_input = get_model_input_time(t_continuous)
return noise_pred(model, x, t_input, **model_kwargs)
``
where `t_continuous` is the continuous time labels (i.e. epsilon to T). And we use `model_fn` for DPM-Solver.
===============================================================
Args:
model: A diffusion model with the corresponding format described above.
noise_schedule: A noise schedule object, such as NoiseScheduleVP.
model_type: A `str`. The parameterization type of the diffusion model.
"noise" or "x_start" or "v" or "score".
model_kwargs: A `dict`. A dict for the other inputs of the model function.
guidance_type: A `str`. The type of the guidance for sampling.
"uncond" or "classifier" or "classifier-free".
condition: A pytorch tensor. The condition for the guided sampling.
Only used for "classifier" or "classifier-free" guidance type.
unconditional_condition: A pytorch tensor. The condition for the unconditional sampling.
Only used for "classifier-free" guidance type.
guidance_scale: A `float`. The scale for the guided sampling.
classifier_fn: A classifier function. Only used for the classifier guidance.
classifier_kwargs: A `dict`. A dict for the other inputs of the classifier function.
Returns:
A noise prediction model that accepts the noised data and the continuous time as the inputs.
"""
def get_model_input_time(t_continuous):
"""
Convert the continuous-time `t_continuous` (in [epsilon, T]) to the model input time.
For discrete-time DPMs, we convert `t_continuous` in [1 / N, 1] to `t_input` in [0, 1000 * (N - 1) / N].
For continuous-time DPMs, we just use `t_continuous`.
"""
if noise_schedule.schedule == 'discrete':
return (t_continuous - 1. / noise_schedule.total_N) * 1000.
else:
return t_continuous
def noise_pred_fn(x, t_continuous, cond=None):
if t_continuous.reshape((-1,)).shape[0] == 1:
t_continuous = t_continuous.expand((x.shape[0]))
t_input = get_model_input_time(t_continuous)
output = model(x, t_input, **model_kwargs)
if model_type == "noise":
return output
elif model_type == "x_start":
alpha_t, sigma_t = noise_schedule.marginal_alpha(t_continuous), noise_schedule.marginal_std(t_continuous)
dims = x.dim()
return (x - expand_dims(alpha_t, dims) * output) / expand_dims(sigma_t, dims)
elif model_type == "v":
alpha_t, sigma_t = noise_schedule.marginal_alpha(t_continuous), noise_schedule.marginal_std(t_continuous)
dims = x.dim()
return expand_dims(alpha_t, dims) * output + expand_dims(sigma_t, dims) * x
elif model_type == "score":
sigma_t = noise_schedule.marginal_std(t_continuous)
dims = x.dim()
return -expand_dims(sigma_t, dims) * output
def cond_grad_fn(x, t_input):
"""
Compute the gradient of the classifier, i.e. nabla_{x} log p_t(cond | x_t).
"""
with torch.enable_grad():
x_in = x.detach().requires_grad_(True)
log_prob = classifier_fn(x_in, t_input, condition, **classifier_kwargs)
return torch.autograd.grad(log_prob.sum(), x_in)[0]
def model_fn(x, t_continuous):
"""
The noise predicition model function that is used for DPM-Solver.
"""
if t_continuous.reshape((-1,)).shape[0] == 1:
t_continuous = t_continuous.expand((x.shape[0]))
if guidance_type == "uncond":
return noise_pred_fn(x, t_continuous)
elif guidance_type == "classifier":
assert classifier_fn is not None
t_input = get_model_input_time(t_continuous)
cond_grad = cond_grad_fn(x, t_input)
sigma_t = noise_schedule.marginal_std(t_continuous)
noise = noise_pred_fn(x, t_continuous)
return noise - guidance_scale * expand_dims(sigma_t, dims=cond_grad.dim()) * cond_grad
elif guidance_type == "classifier-free":
if guidance_scale == 1. or unconditional_condition is None:
return noise_pred_fn(x, t_continuous, cond=condition)
else:
x_in = torch.cat([x] * 2)
t_in = torch.cat([t_continuous] * 2)
c_in = torch.cat([unconditional_condition, condition])
noise_uncond, noise = noise_pred_fn(x_in, t_in, cond=c_in).chunk(2)
return noise_uncond + guidance_scale * (noise - noise_uncond)
assert model_type in ["noise", "x_start", "v"]
assert guidance_type in ["uncond", "classifier", "classifier-free"]
return model_fn
class UniPC:
def __init__(
self,
model_fn,
noise_schedule,
predict_x0=True,
thresholding=False,
max_val=1.,
variant='bh1',
):
"""Construct a UniPC.
We support both data_prediction and noise_prediction.
"""
self.model = model_fn
self.noise_schedule = noise_schedule
self.variant = variant
self.predict_x0 = predict_x0
self.thresholding = thresholding
self.max_val = max_val
def dynamic_thresholding_fn(self, x0, t=None):
"""
The dynamic thresholding method.
"""
dims = x0.dim()
p = self.dynamic_thresholding_ratio
s = torch.quantile(torch.abs(x0).reshape((x0.shape[0], -1)), p, dim=1)
s = expand_dims(torch.maximum(s, self.thresholding_max_val * torch.ones_like(s).to(s.device)), dims)
x0 = torch.clamp(x0, -s, s) / s
return x0
def noise_prediction_fn(self, x, t):
"""
Return the noise prediction model.
"""
return self.model(x, t)
def data_prediction_fn(self, x, t):
"""
Return the data prediction model (with thresholding).
"""
noise = self.noise_prediction_fn(x, t)
dims = x.dim()
alpha_t, sigma_t = self.noise_schedule.marginal_alpha(t), self.noise_schedule.marginal_std(t)
x0 = (x - expand_dims(sigma_t, dims) * noise) / expand_dims(alpha_t, dims)
if self.thresholding:
p = 0.995 # A hyperparameter in the paper of "Imagen" [1].
s = torch.quantile(torch.abs(x0).reshape((x0.shape[0], -1)), p, dim=1)
s = expand_dims(torch.maximum(s, self.max_val * torch.ones_like(s).to(s.device)), dims)
x0 = torch.clamp(x0, -s, s) / s
return x0
def model_fn(self, x, t):
"""
Convert the model to the noise prediction model or the data prediction model.
"""
if self.predict_x0:
return self.data_prediction_fn(x, t)
else:
return self.noise_prediction_fn(x, t)
def get_time_steps(self, skip_type, t_T, t_0, N, device):
"""Compute the intermediate time steps for sampling.
"""
if skip_type == 'logSNR':
lambda_T = self.noise_schedule.marginal_lambda(torch.tensor(t_T).to(device))
lambda_0 = self.noise_schedule.marginal_lambda(torch.tensor(t_0).to(device))
logSNR_steps = torch.linspace(lambda_T.cpu().item(), lambda_0.cpu().item(), N + 1).to(device)
return self.noise_schedule.inverse_lambda(logSNR_steps)
elif skip_type == 'time_uniform':
return torch.linspace(t_T, t_0, N + 1).to(device)
elif skip_type == 'time_quadratic':
t_order = 2
t = torch.linspace(t_T**(1. / t_order), t_0**(1. / t_order), N + 1).pow(t_order).to(device)
return t
else:
raise ValueError("Unsupported skip_type {}, need to be 'logSNR' or 'time_uniform' or 'time_quadratic'".format(skip_type))
def get_orders_and_timesteps_for_singlestep_solver(self, steps, order, skip_type, t_T, t_0, device):
"""
Get the order of each step for sampling by the singlestep DPM-Solver.
"""
if order == 3:
K = steps // 3 + 1
if steps % 3 == 0:
orders = [3,] * (K - 2) + [2, 1]
elif steps % 3 == 1:
orders = [3,] * (K - 1) + [1]
else:
orders = [3,] * (K - 1) + [2]
elif order == 2:
if steps % 2 == 0:
K = steps // 2
orders = [2,] * K
else:
K = steps // 2 + 1
orders = [2,] * (K - 1) + [1]
elif order == 1:
K = steps
orders = [1,] * steps
else:
raise ValueError("'order' must be '1' or '2' or '3'.")
if skip_type == 'logSNR':
# To reproduce the results in DPM-Solver paper
timesteps_outer = self.get_time_steps(skip_type, t_T, t_0, K, device)
else:
timesteps_outer = self.get_time_steps(skip_type, t_T, t_0, steps, device)[torch.cumsum(torch.tensor([0,] + orders), 0).to(device)]
return timesteps_outer, orders
def denoise_to_zero_fn(self, x, s):
"""
Denoise at the final step, which is equivalent to solve the ODE from lambda_s to infty by first-order discretization.
"""
return self.data_prediction_fn(x, s)
def multistep_uni_pc_update(self, x, model_prev_list, t_prev_list, t, order, **kwargs):
if len(t.shape) == 0:
t = t.view(-1)
if 'bh' in self.variant:
return self.multistep_uni_pc_bh_update(x, model_prev_list, t_prev_list, t, order, **kwargs)
else:
assert self.variant == 'vary_coeff'
return self.multistep_uni_pc_vary_update(x, model_prev_list, t_prev_list, t, order, **kwargs)
def multistep_uni_pc_vary_update(self, x, model_prev_list, t_prev_list, t, order, use_corrector=True):
print(f'using unified predictor-corrector with order {order} (solver type: vary coeff)')
ns = self.noise_schedule
assert order <= len(model_prev_list)
# first compute rks
t_prev_0 = t_prev_list[-1]
lambda_prev_0 = ns.marginal_lambda(t_prev_0)
lambda_t = ns.marginal_lambda(t)
model_prev_0 = model_prev_list[-1]
sigma_prev_0, sigma_t = ns.marginal_std(t_prev_0), ns.marginal_std(t)
log_alpha_t = ns.marginal_log_mean_coeff(t)
alpha_t = torch.exp(log_alpha_t)
h = lambda_t - lambda_prev_0
rks = []
D1s = []
for i in range(1, order):
t_prev_i = t_prev_list[-(i + 1)]
model_prev_i = model_prev_list[-(i + 1)]
lambda_prev_i = ns.marginal_lambda(t_prev_i)
rk = (lambda_prev_i - lambda_prev_0) / h
rks.append(rk)
D1s.append((model_prev_i - model_prev_0) / rk)
rks.append(1.)
rks = torch.tensor(rks, device=x.device)
K = len(rks)
# build C matrix
C = []
col = torch.ones_like(rks)
for k in range(1, K + 1):
C.append(col)
col = col * rks / (k + 1)
C = torch.stack(C, dim=1)
if len(D1s) > 0:
D1s = torch.stack(D1s, dim=1) # (B, K)
C_inv_p = torch.linalg.inv(C[:-1, :-1])
A_p = C_inv_p
if use_corrector:
print('using corrector')
C_inv = torch.linalg.inv(C)
A_c = C_inv
hh = -h if self.predict_x0 else h
h_phi_1 = torch.expm1(hh)
h_phi_ks = []
factorial_k = 1
h_phi_k = h_phi_1
for k in range(1, K + 2):
h_phi_ks.append(h_phi_k)
h_phi_k = h_phi_k / hh - 1 / factorial_k
factorial_k *= (k + 1)
model_t = None
if self.predict_x0:
x_t_ = (
sigma_t / sigma_prev_0 * x
- alpha_t * h_phi_1 * model_prev_0
)
# now predictor
x_t = x_t_
if len(D1s) > 0:
# compute the residuals for predictor
for k in range(K - 1):
x_t = x_t - alpha_t * h_phi_ks[k + 1] * torch.einsum('bkchw,k->bchw', D1s, A_p[k])
# now corrector
if use_corrector:
model_t = self.model_fn(x_t, t)
D1_t = (model_t - model_prev_0)
x_t = x_t_
k = 0
for k in range(K - 1):
x_t = x_t - alpha_t * h_phi_ks[k + 1] * torch.einsum('bkchw,k->bchw', D1s, A_c[k][:-1])
x_t = x_t - alpha_t * h_phi_ks[K] * (D1_t * A_c[k][-1])
else:
log_alpha_prev_0, log_alpha_t = ns.marginal_log_mean_coeff(t_prev_0), ns.marginal_log_mean_coeff(t)
x_t_ = (
(torch.exp(log_alpha_t - log_alpha_prev_0)) * x
- (sigma_t * h_phi_1) * model_prev_0
)
# now predictor
x_t = x_t_
if len(D1s) > 0:
# compute the residuals for predictor
for k in range(K - 1):
x_t = x_t - sigma_t * h_phi_ks[k + 1] * torch.einsum('bkchw,k->bchw', D1s, A_p[k])
# now corrector
if use_corrector:
model_t = self.model_fn(x_t, t)
D1_t = (model_t - model_prev_0)
x_t = x_t_
k = 0
for k in range(K - 1):
x_t = x_t - sigma_t * h_phi_ks[k + 1] * torch.einsum('bkchw,k->bchw', D1s, A_c[k][:-1])
x_t = x_t - sigma_t * h_phi_ks[K] * (D1_t * A_c[k][-1])
return x_t, model_t
def multistep_uni_pc_bh_update(self, x, model_prev_list, t_prev_list, t, order, x_t=None, use_corrector=True):
# print(f'using unified predictor-corrector with order {order} (solver type: B(h))')
ns = self.noise_schedule
assert order <= len(model_prev_list)
dims = x.dim()
# first compute rks
t_prev_0 = t_prev_list[-1]
lambda_prev_0 = ns.marginal_lambda(t_prev_0)
lambda_t = ns.marginal_lambda(t)
model_prev_0 = model_prev_list[-1]
sigma_prev_0, sigma_t = ns.marginal_std(t_prev_0), ns.marginal_std(t)
log_alpha_prev_0, log_alpha_t = ns.marginal_log_mean_coeff(t_prev_0), ns.marginal_log_mean_coeff(t)
alpha_t = torch.exp(log_alpha_t)
h = lambda_t - lambda_prev_0
rks = []
D1s = []
for i in range(1, order):
t_prev_i = t_prev_list[-(i + 1)]
model_prev_i = model_prev_list[-(i + 1)]
lambda_prev_i = ns.marginal_lambda(t_prev_i)
rk = ((lambda_prev_i - lambda_prev_0) / h)[0]
rks.append(rk)
D1s.append((model_prev_i - model_prev_0) / rk)
rks.append(1.)
rks = torch.tensor(rks, device=x.device)
R = []
b = []
hh = -h[0] if self.predict_x0 else h[0]
h_phi_1 = torch.expm1(hh) # h\phi_1(h) = e^h - 1
h_phi_k = h_phi_1 / hh - 1
factorial_i = 1
if self.variant == 'bh1':
B_h = hh
elif self.variant == 'bh2':
B_h = torch.expm1(hh)
else:
raise NotImplementedError()
for i in range(1, order + 1):
R.append(torch.pow(rks, i - 1))
b.append(h_phi_k * factorial_i / B_h)
factorial_i *= (i + 1)
h_phi_k = h_phi_k / hh - 1 / factorial_i
R = torch.stack(R)
b = torch.tensor(b, device=x.device)
# now predictor
use_predictor = len(D1s) > 0 and x_t is None
if len(D1s) > 0:
D1s = torch.stack(D1s, dim=1) # (B, K)
if x_t is None:
# for order 2, we use a simplified version
if order == 2:
rhos_p = torch.tensor([0.5], device=b.device)
else:
rhos_p = torch.linalg.solve(R[:-1, :-1], b[:-1])
else:
D1s = None
if use_corrector:
# print('using corrector')
# for order 1, we use a simplified version
if order == 1:
rhos_c = torch.tensor([0.5], device=b.device)
else:
rhos_c = torch.linalg.solve(R, b)
model_t = None
if self.predict_x0:
x_t_ = (
expand_dims(sigma_t / sigma_prev_0, dims) * x
- expand_dims(alpha_t * h_phi_1, dims)* model_prev_0
)
if x_t is None:
if use_predictor:
pred_res = torch.einsum('k,bkchw->bchw', rhos_p, D1s)
else:
pred_res = 0
x_t = x_t_ - expand_dims(alpha_t * B_h, dims) * pred_res
if use_corrector:
model_t = self.model_fn(x_t, t)
if D1s is not None:
corr_res = torch.einsum('k,bkchw->bchw', rhos_c[:-1], D1s)
else:
corr_res = 0
D1_t = (model_t - model_prev_0)
x_t = x_t_ - expand_dims(alpha_t * B_h, dims) * (corr_res + rhos_c[-1] * D1_t)
else:
x_t_ = (
expand_dims(torch.exp(log_alpha_t - log_alpha_prev_0), dims) * x
- expand_dims(sigma_t * h_phi_1, dims) * model_prev_0
)
if x_t is None:
if use_predictor:
pred_res = torch.einsum('k,bkchw->bchw', rhos_p, D1s)
else:
pred_res = 0
x_t = x_t_ - expand_dims(sigma_t * B_h, dims) * pred_res
if use_corrector:
model_t = self.model_fn(x_t, t)
if D1s is not None:
corr_res = torch.einsum('k,bkchw->bchw', rhos_c[:-1], D1s)
else:
corr_res = 0
D1_t = (model_t - model_prev_0)
x_t = x_t_ - expand_dims(sigma_t * B_h, dims) * (corr_res + rhos_c[-1] * D1_t)
return x_t, model_t
def sample(self, x, timesteps, t_start=None, t_end=None, order=3, skip_type='time_uniform',
method='singlestep', lower_order_final=True, denoise_to_zero=False, solver_type='dpm_solver',
atol=0.0078, rtol=0.05, corrector=False, callback=None, disable_pbar=False
):
# t_0 = 1. / self.noise_schedule.total_N if t_end is None else t_end
# t_T = self.noise_schedule.T if t_start is None else t_start
device = x.device
steps = len(timesteps) - 1
if method == 'multistep':
assert steps >= order
# timesteps = self.get_time_steps(skip_type=skip_type, t_T=t_T, t_0=t_0, N=steps, device=device)
assert timesteps.shape[0] - 1 == steps
# with torch.no_grad():
for step_index in trange(steps, disable=disable_pbar):
if step_index == 0:
vec_t = timesteps[0].expand((x.shape[0]))
model_prev_list = [self.model_fn(x, vec_t)]
t_prev_list = [vec_t]
elif step_index < order:
init_order = step_index
# Init the first `order` values by lower order multistep DPM-Solver.
# for init_order in range(1, order):
vec_t = timesteps[init_order].expand(x.shape[0])
x, model_x = self.multistep_uni_pc_update(x, model_prev_list, t_prev_list, vec_t, init_order, use_corrector=True)
if model_x is None:
model_x = self.model_fn(x, vec_t)
model_prev_list.append(model_x)
t_prev_list.append(vec_t)
else:
extra_final_step = 0
if step_index == (steps - 1):
extra_final_step = 1
for step in range(step_index, step_index + 1 + extra_final_step):
vec_t = timesteps[step].expand(x.shape[0])
if lower_order_final:
step_order = min(order, steps + 1 - step)
else:
step_order = order
# print('this step order:', step_order)
if step == steps:
# print('do not run corrector at the last step')
use_corrector = False
else:
use_corrector = True
x, model_x = self.multistep_uni_pc_update(x, model_prev_list, t_prev_list, vec_t, step_order, use_corrector=use_corrector)
for i in range(order - 1):
t_prev_list[i] = t_prev_list[i + 1]
model_prev_list[i] = model_prev_list[i + 1]
t_prev_list[-1] = vec_t
# We do not need to evaluate the final model value.
if step < steps:
if model_x is None:
model_x = self.model_fn(x, vec_t)
model_prev_list[-1] = model_x
if callback is not None:
callback({'x': x, 'i': step_index, 'denoised': model_prev_list[-1]})
else:
raise NotImplementedError()
# if denoise_to_zero:
# x = self.denoise_to_zero_fn(x, torch.ones((x.shape[0],)).to(device) * t_0)
return x
#############################################################
# other utility functions
#############################################################
def interpolate_fn(x, xp, yp):
"""
A piecewise linear function y = f(x), using xp and yp as keypoints.
We implement f(x) in a differentiable way (i.e. applicable for autograd).
The function f(x) is well-defined for all x-axis. (For x beyond the bounds of xp, we use the outmost points of xp to define the linear function.)
Args:
x: PyTorch tensor with shape [N, C], where N is the batch size, C is the number of channels (we use C = 1 for DPM-Solver).
xp: PyTorch tensor with shape [C, K], where K is the number of keypoints.
yp: PyTorch tensor with shape [C, K].
Returns:
The function values f(x), with shape [N, C].
"""
N, K = x.shape[0], xp.shape[1]
all_x = torch.cat([x.unsqueeze(2), xp.unsqueeze(0).repeat((N, 1, 1))], dim=2)
sorted_all_x, x_indices = torch.sort(all_x, dim=2)
x_idx = torch.argmin(x_indices, dim=2)
cand_start_idx = x_idx - 1
start_idx = torch.where(
torch.eq(x_idx, 0),
torch.tensor(1, device=x.device),
torch.where(
torch.eq(x_idx, K), torch.tensor(K - 2, device=x.device), cand_start_idx,
),
)
end_idx = torch.where(torch.eq(start_idx, cand_start_idx), start_idx + 2, start_idx + 1)
start_x = torch.gather(sorted_all_x, dim=2, index=start_idx.unsqueeze(2)).squeeze(2)
end_x = torch.gather(sorted_all_x, dim=2, index=end_idx.unsqueeze(2)).squeeze(2)
start_idx2 = torch.where(
torch.eq(x_idx, 0),
torch.tensor(0, device=x.device),
torch.where(
torch.eq(x_idx, K), torch.tensor(K - 2, device=x.device), cand_start_idx,
),
)
y_positions_expanded = yp.unsqueeze(0).expand(N, -1, -1)
start_y = torch.gather(y_positions_expanded, dim=2, index=start_idx2.unsqueeze(2)).squeeze(2)
end_y = torch.gather(y_positions_expanded, dim=2, index=(start_idx2 + 1).unsqueeze(2)).squeeze(2)
cand = start_y + (x - start_x) * (end_y - start_y) / (end_x - start_x)
return cand
def expand_dims(v, dims):
"""
Expand the tensor `v` to the dim `dims`.
Args:
`v`: a PyTorch tensor with shape [N].
`dim`: a `int`.
Returns:
a PyTorch tensor with shape [N, 1, 1, ..., 1] and the total dimension is `dims`.
"""
return v[(...,) + (None,)*(dims - 1)]
class SigmaConvert:
schedule = ""
def marginal_log_mean_coeff(self, sigma):
return 0.5 * torch.log(1 / ((sigma * sigma) + 1))
def marginal_alpha(self, t):
return torch.exp(self.marginal_log_mean_coeff(t))
def marginal_std(self, t):
return torch.sqrt(1. - torch.exp(2. * self.marginal_log_mean_coeff(t)))
def marginal_lambda(self, t):
"""
Compute lambda_t = log(alpha_t) - log(sigma_t) of a given continuous-time label t in [0, T].
"""
log_mean_coeff = self.marginal_log_mean_coeff(t)
log_std = 0.5 * torch.log(1. - torch.exp(2. * log_mean_coeff))
return log_mean_coeff - log_std
def predict_eps_sigma(model, input, sigma_in, **kwargs):
sigma = sigma_in.view(sigma_in.shape[:1] + (1,) * (input.ndim - 1))
input = input * ((sigma ** 2 + 1.0) ** 0.5)
return (input - model(input, sigma_in, **kwargs)) / sigma
def sample_unipc(model, noise, sigmas, extra_args=None, callback=None, disable=False, variant='bh1'):
timesteps = sigmas.clone()
if sigmas[-1] == 0:
timesteps = sigmas[:]
timesteps[-1] = 0.001
else:
timesteps = sigmas.clone()
ns = SigmaConvert()
noise = noise / torch.sqrt(1.0 + timesteps[0] ** 2.0)
model_type = "noise"
model_fn = model_wrapper(
lambda input, sigma, **kwargs: predict_eps_sigma(model, input, sigma, **kwargs),
ns,
model_type=model_type,
guidance_type="uncond",
model_kwargs=extra_args,
)
order = min(3, len(timesteps) - 2)
uni_pc = UniPC(model_fn, ns, predict_x0=True, thresholding=False, variant=variant)
x = uni_pc.sample(noise, timesteps=timesteps, skip_type="time_uniform", method="multistep", order=order, lower_order_final=True, callback=callback, disable_pbar=disable)
x /= ns.marginal_alpha(timesteps[-1])
return x
def sample_unipc_bh2(model, noise, sigmas, extra_args=None, callback=None, disable=False):
return sample_unipc(model, noise, sigmas, extra_args, callback, disable, variant='bh2')

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import torch
from torch import nn
from .ldm.modules.attention import CrossAttention
from inspect import isfunction
import comfy.ops
ops = comfy.ops.manual_cast
def exists(val):
return val is not None
def uniq(arr):
return{el: True for el in arr}.keys()
def default(val, d):
if exists(val):
return val
return d() if isfunction(d) else d
# feedforward
class GEGLU(nn.Module):
def __init__(self, dim_in, dim_out):
super().__init__()
self.proj = ops.Linear(dim_in, dim_out * 2)
def forward(self, x):
x, gate = self.proj(x).chunk(2, dim=-1)
return x * torch.nn.functional.gelu(gate)
class FeedForward(nn.Module):
def __init__(self, dim, dim_out=None, mult=4, glu=False, dropout=0.):
super().__init__()
inner_dim = int(dim * mult)
dim_out = default(dim_out, dim)
project_in = nn.Sequential(
ops.Linear(dim, inner_dim),
nn.GELU()
) if not glu else GEGLU(dim, inner_dim)
self.net = nn.Sequential(
project_in,
nn.Dropout(dropout),
ops.Linear(inner_dim, dim_out)
)
def forward(self, x):
return self.net(x)
class GatedCrossAttentionDense(nn.Module):
def __init__(self, query_dim, context_dim, n_heads, d_head):
super().__init__()
self.attn = CrossAttention(
query_dim=query_dim,
context_dim=context_dim,
heads=n_heads,
dim_head=d_head,
operations=ops)
self.ff = FeedForward(query_dim, glu=True)
self.norm1 = ops.LayerNorm(query_dim)
self.norm2 = ops.LayerNorm(query_dim)
self.register_parameter('alpha_attn', nn.Parameter(torch.tensor(0.)))
self.register_parameter('alpha_dense', nn.Parameter(torch.tensor(0.)))
# this can be useful: we can externally change magnitude of tanh(alpha)
# for example, when it is set to 0, then the entire model is same as
# original one
self.scale = 1
def forward(self, x, objs):
x = x + self.scale * \
torch.tanh(self.alpha_attn) * self.attn(self.norm1(x), objs, objs)
x = x + self.scale * \
torch.tanh(self.alpha_dense) * self.ff(self.norm2(x))
return x
class GatedSelfAttentionDense(nn.Module):
def __init__(self, query_dim, context_dim, n_heads, d_head):
super().__init__()
# we need a linear projection since we need cat visual feature and obj
# feature
self.linear = ops.Linear(context_dim, query_dim)
self.attn = CrossAttention(
query_dim=query_dim,
context_dim=query_dim,
heads=n_heads,
dim_head=d_head,
operations=ops)
self.ff = FeedForward(query_dim, glu=True)
self.norm1 = ops.LayerNorm(query_dim)
self.norm2 = ops.LayerNorm(query_dim)
self.register_parameter('alpha_attn', nn.Parameter(torch.tensor(0.)))
self.register_parameter('alpha_dense', nn.Parameter(torch.tensor(0.)))
# this can be useful: we can externally change magnitude of tanh(alpha)
# for example, when it is set to 0, then the entire model is same as
# original one
self.scale = 1
def forward(self, x, objs):
N_visual = x.shape[1]
objs = self.linear(objs)
x = x + self.scale * torch.tanh(self.alpha_attn) * self.attn(
self.norm1(torch.cat([x, objs], dim=1)))[:, 0:N_visual, :]
x = x + self.scale * \
torch.tanh(self.alpha_dense) * self.ff(self.norm2(x))
return x
class GatedSelfAttentionDense2(nn.Module):
def __init__(self, query_dim, context_dim, n_heads, d_head):
super().__init__()
# we need a linear projection since we need cat visual feature and obj
# feature
self.linear = ops.Linear(context_dim, query_dim)
self.attn = CrossAttention(
query_dim=query_dim, context_dim=query_dim, dim_head=d_head, operations=ops)
self.ff = FeedForward(query_dim, glu=True)
self.norm1 = ops.LayerNorm(query_dim)
self.norm2 = ops.LayerNorm(query_dim)
self.register_parameter('alpha_attn', nn.Parameter(torch.tensor(0.)))
self.register_parameter('alpha_dense', nn.Parameter(torch.tensor(0.)))
# this can be useful: we can externally change magnitude of tanh(alpha)
# for example, when it is set to 0, then the entire model is same as
# original one
self.scale = 1
def forward(self, x, objs):
B, N_visual, _ = x.shape
B, N_ground, _ = objs.shape
objs = self.linear(objs)
# sanity check
size_v = math.sqrt(N_visual)
size_g = math.sqrt(N_ground)
assert int(size_v) == size_v, "Visual tokens must be square rootable"
assert int(size_g) == size_g, "Grounding tokens must be square rootable"
size_v = int(size_v)
size_g = int(size_g)
# select grounding token and resize it to visual token size as residual
out = self.attn(self.norm1(torch.cat([x, objs], dim=1)))[
:, N_visual:, :]
out = out.permute(0, 2, 1).reshape(B, -1, size_g, size_g)
out = torch.nn.functional.interpolate(
out, (size_v, size_v), mode='bicubic')
residual = out.reshape(B, -1, N_visual).permute(0, 2, 1)
# add residual to visual feature
x = x + self.scale * torch.tanh(self.alpha_attn) * residual
x = x + self.scale * \
torch.tanh(self.alpha_dense) * self.ff(self.norm2(x))
return x
class FourierEmbedder():
def __init__(self, num_freqs=64, temperature=100):
self.num_freqs = num_freqs
self.temperature = temperature
self.freq_bands = temperature ** (torch.arange(num_freqs) / num_freqs)
@torch.no_grad()
def __call__(self, x, cat_dim=-1):
"x: arbitrary shape of tensor. dim: cat dim"
out = []
for freq in self.freq_bands:
out.append(torch.sin(freq * x))
out.append(torch.cos(freq * x))
return torch.cat(out, cat_dim)
class PositionNet(nn.Module):
def __init__(self, in_dim, out_dim, fourier_freqs=8):
super().__init__()
self.in_dim = in_dim
self.out_dim = out_dim
self.fourier_embedder = FourierEmbedder(num_freqs=fourier_freqs)
self.position_dim = fourier_freqs * 2 * 4 # 2 is sin&cos, 4 is xyxy
self.linears = nn.Sequential(
ops.Linear(self.in_dim + self.position_dim, 512),
nn.SiLU(),
ops.Linear(512, 512),
nn.SiLU(),
ops.Linear(512, out_dim),
)
self.null_positive_feature = torch.nn.Parameter(
torch.zeros([self.in_dim]))
self.null_position_feature = torch.nn.Parameter(
torch.zeros([self.position_dim]))
def forward(self, boxes, masks, positive_embeddings):
B, N, _ = boxes.shape
masks = masks.unsqueeze(-1)
positive_embeddings = positive_embeddings
# embedding position (it may includes padding as placeholder)
xyxy_embedding = self.fourier_embedder(boxes) # B*N*4 --> B*N*C
# learnable null embedding
positive_null = self.null_positive_feature.to(device=boxes.device, dtype=boxes.dtype).view(1, 1, -1)
xyxy_null = self.null_position_feature.to(device=boxes.device, dtype=boxes.dtype).view(1, 1, -1)
# replace padding with learnable null embedding
positive_embeddings = positive_embeddings * \
masks + (1 - masks) * positive_null
xyxy_embedding = xyxy_embedding * masks + (1 - masks) * xyxy_null
objs = self.linears(
torch.cat([positive_embeddings, xyxy_embedding], dim=-1))
assert objs.shape == torch.Size([B, N, self.out_dim])
return objs
class Gligen(nn.Module):
def __init__(self, modules, position_net, key_dim):
super().__init__()
self.module_list = nn.ModuleList(modules)
self.position_net = position_net
self.key_dim = key_dim
self.max_objs = 30
self.current_device = torch.device("cpu")
def _set_position(self, boxes, masks, positive_embeddings):
objs = self.position_net(boxes, masks, positive_embeddings)
def func(x, extra_options):
key = extra_options["transformer_index"]
module = self.module_list[key]
return module(x, objs.to(device=x.device, dtype=x.dtype))
return func
def set_position(self, latent_image_shape, position_params, device):
batch, c, h, w = latent_image_shape
masks = torch.zeros([self.max_objs], device="cpu")
boxes = []
positive_embeddings = []
for p in position_params:
x1 = (p[4]) / w
y1 = (p[3]) / h
x2 = (p[4] + p[2]) / w
y2 = (p[3] + p[1]) / h
masks[len(boxes)] = 1.0
boxes += [torch.tensor((x1, y1, x2, y2)).unsqueeze(0)]
positive_embeddings += [p[0]]
append_boxes = []
append_conds = []
if len(boxes) < self.max_objs:
append_boxes = [torch.zeros(
[self.max_objs - len(boxes), 4], device="cpu")]
append_conds = [torch.zeros(
[self.max_objs - len(boxes), self.key_dim], device="cpu")]
box_out = torch.cat(
boxes + append_boxes).unsqueeze(0).repeat(batch, 1, 1)
masks = masks.unsqueeze(0).repeat(batch, 1)
conds = torch.cat(positive_embeddings +
append_conds).unsqueeze(0).repeat(batch, 1, 1)
return self._set_position(
box_out.to(device),
masks.to(device),
conds.to(device))
def set_empty(self, latent_image_shape, device):
batch, c, h, w = latent_image_shape
masks = torch.zeros([self.max_objs], device="cpu").repeat(batch, 1)
box_out = torch.zeros([self.max_objs, 4],
device="cpu").repeat(batch, 1, 1)
conds = torch.zeros([self.max_objs, self.key_dim],
device="cpu").repeat(batch, 1, 1)
return self._set_position(
box_out.to(device),
masks.to(device),
conds.to(device))
def load_gligen(sd):
sd_k = sd.keys()
output_list = []
key_dim = 768
for a in ["input_blocks", "middle_block", "output_blocks"]:
for b in range(20):
k_temp = filter(lambda k: "{}.{}.".format(a, b)
in k and ".fuser." in k, sd_k)
k_temp = map(lambda k: (k, k.split(".fuser.")[-1]), k_temp)
n_sd = {}
for k in k_temp:
n_sd[k[1]] = sd[k[0]]
if len(n_sd) > 0:
query_dim = n_sd["linear.weight"].shape[0]
key_dim = n_sd["linear.weight"].shape[1]
if key_dim == 768: # SD1.x
n_heads = 8
d_head = query_dim // n_heads
else:
d_head = 64
n_heads = query_dim // d_head
gated = GatedSelfAttentionDense(
query_dim, key_dim, n_heads, d_head)
gated.load_state_dict(n_sd, strict=False)
output_list.append(gated)
if "position_net.null_positive_feature" in sd_k:
in_dim = sd["position_net.null_positive_feature"].shape[0]
out_dim = sd["position_net.linears.4.weight"].shape[0]
class WeightsLoader(torch.nn.Module):
pass
w = WeightsLoader()
w.position_net = PositionNet(in_dim, out_dim)
w.load_state_dict(sd, strict=False)
gligen = Gligen(output_list, w.position_net, key_dim)
return gligen

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#Taken from: https://github.com/zju-pi/diff-sampler/blob/main/gits-main/solver_utils.py
#under Apache 2 license
import torch
import numpy as np
# A pytorch reimplementation of DEIS (https://github.com/qsh-zh/deis).
#############################
### Utils for DEIS solver ###
#############################
#----------------------------------------------------------------------------
# Transfer from the input time (sigma) used in EDM to that (t) used in DEIS.
def edm2t(edm_steps, epsilon_s=1e-3, sigma_min=0.002, sigma_max=80):
vp_sigma = lambda beta_d, beta_min: lambda t: (np.e ** (0.5 * beta_d * (t ** 2) + beta_min * t) - 1) ** 0.5
vp_sigma_inv = lambda beta_d, beta_min: lambda sigma: ((beta_min ** 2 + 2 * beta_d * (sigma ** 2 + 1).log()).sqrt() - beta_min) / beta_d
vp_beta_d = 2 * (np.log(torch.tensor(sigma_min).cpu() ** 2 + 1) / epsilon_s - np.log(torch.tensor(sigma_max).cpu() ** 2 + 1)) / (epsilon_s - 1)
vp_beta_min = np.log(torch.tensor(sigma_max).cpu() ** 2 + 1) - 0.5 * vp_beta_d
t_steps = vp_sigma_inv(vp_beta_d.clone().detach().cpu(), vp_beta_min.clone().detach().cpu())(edm_steps.clone().detach().cpu())
return t_steps, vp_beta_min, vp_beta_d + vp_beta_min
#----------------------------------------------------------------------------
def cal_poly(prev_t, j, taus):
poly = 1
for k in range(prev_t.shape[0]):
if k == j:
continue
poly *= (taus - prev_t[k]) / (prev_t[j] - prev_t[k])
return poly
#----------------------------------------------------------------------------
# Transfer from t to alpha_t.
def t2alpha_fn(beta_0, beta_1, t):
return torch.exp(-0.5 * t ** 2 * (beta_1 - beta_0) - t * beta_0)
#----------------------------------------------------------------------------
def cal_intergrand(beta_0, beta_1, taus):
with torch.inference_mode(mode=False):
taus = taus.clone()
beta_0 = beta_0.clone()
beta_1 = beta_1.clone()
with torch.enable_grad():
taus.requires_grad_(True)
alpha = t2alpha_fn(beta_0, beta_1, taus)
log_alpha = alpha.log()
log_alpha.sum().backward()
d_log_alpha_dtau = taus.grad
integrand = -0.5 * d_log_alpha_dtau / torch.sqrt(alpha * (1 - alpha))
return integrand
#----------------------------------------------------------------------------
def get_deis_coeff_list(t_steps, max_order, N=10000, deis_mode='tab'):
"""
Get the coefficient list for DEIS sampling.
Args:
t_steps: A pytorch tensor. The time steps for sampling.
max_order: A `int`. Maximum order of the solver. 1 <= max_order <= 4
N: A `int`. Use how many points to perform the numerical integration when deis_mode=='tab'.
deis_mode: A `str`. Select between 'tab' and 'rhoab'. Type of DEIS.
Returns:
A pytorch tensor. A batch of generated samples or sampling trajectories if return_inters=True.
"""
if deis_mode == 'tab':
t_steps, beta_0, beta_1 = edm2t(t_steps)
C = []
for i, (t_cur, t_next) in enumerate(zip(t_steps[:-1], t_steps[1:])):
order = min(i+1, max_order)
if order == 1:
C.append([])
else:
taus = torch.linspace(t_cur, t_next, N) # split the interval for integral appximation
dtau = (t_next - t_cur) / N
prev_t = t_steps[[i - k for k in range(order)]]
coeff_temp = []
integrand = cal_intergrand(beta_0, beta_1, taus)
for j in range(order):
poly = cal_poly(prev_t, j, taus)
coeff_temp.append(torch.sum(integrand * poly) * dtau)
C.append(coeff_temp)
elif deis_mode == 'rhoab':
# Analytical solution, second order
def get_def_intergral_2(a, b, start, end, c):
coeff = (end**3 - start**3) / 3 - (end**2 - start**2) * (a + b) / 2 + (end - start) * a * b
return coeff / ((c - a) * (c - b))
# Analytical solution, third order
def get_def_intergral_3(a, b, c, start, end, d):
coeff = (end**4 - start**4) / 4 - (end**3 - start**3) * (a + b + c) / 3 \
+ (end**2 - start**2) * (a*b + a*c + b*c) / 2 - (end - start) * a * b * c
return coeff / ((d - a) * (d - b) * (d - c))
C = []
for i, (t_cur, t_next) in enumerate(zip(t_steps[:-1], t_steps[1:])):
order = min(i, max_order)
if order == 0:
C.append([])
else:
prev_t = t_steps[[i - k for k in range(order+1)]]
if order == 1:
coeff_cur = ((t_next - prev_t[1])**2 - (t_cur - prev_t[1])**2) / (2 * (t_cur - prev_t[1]))
coeff_prev1 = (t_next - t_cur)**2 / (2 * (prev_t[1] - t_cur))
coeff_temp = [coeff_cur, coeff_prev1]
elif order == 2:
coeff_cur = get_def_intergral_2(prev_t[1], prev_t[2], t_cur, t_next, t_cur)
coeff_prev1 = get_def_intergral_2(t_cur, prev_t[2], t_cur, t_next, prev_t[1])
coeff_prev2 = get_def_intergral_2(t_cur, prev_t[1], t_cur, t_next, prev_t[2])
coeff_temp = [coeff_cur, coeff_prev1, coeff_prev2]
elif order == 3:
coeff_cur = get_def_intergral_3(prev_t[1], prev_t[2], prev_t[3], t_cur, t_next, t_cur)
coeff_prev1 = get_def_intergral_3(t_cur, prev_t[2], prev_t[3], t_cur, t_next, prev_t[1])
coeff_prev2 = get_def_intergral_3(t_cur, prev_t[1], prev_t[3], t_cur, t_next, prev_t[2])
coeff_prev3 = get_def_intergral_3(t_cur, prev_t[1], prev_t[2], t_cur, t_next, prev_t[3])
coeff_temp = [coeff_cur, coeff_prev1, coeff_prev2, coeff_prev3]
C.append(coeff_temp)
return C

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from contextlib import contextmanager
import hashlib
import math
from pathlib import Path
import shutil
import urllib
import warnings
from PIL import Image
import torch
from torch import nn, optim
from torch.utils import data
def hf_datasets_augs_helper(examples, transform, image_key, mode='RGB'):
"""Apply passed in transforms for HuggingFace Datasets."""
images = [transform(image.convert(mode)) for image in examples[image_key]]
return {image_key: images}
def append_dims(x, target_dims):
"""Appends dimensions to the end of a tensor until it has target_dims dimensions."""
dims_to_append = target_dims - x.ndim
if dims_to_append < 0:
raise ValueError(f'input has {x.ndim} dims but target_dims is {target_dims}, which is less')
expanded = x[(...,) + (None,) * dims_to_append]
# MPS will get inf values if it tries to index into the new axes, but detaching fixes this.
# https://github.com/pytorch/pytorch/issues/84364
return expanded.detach().clone() if expanded.device.type == 'mps' else expanded
def n_params(module):
"""Returns the number of trainable parameters in a module."""
return sum(p.numel() for p in module.parameters())
def download_file(path, url, digest=None):
"""Downloads a file if it does not exist, optionally checking its SHA-256 hash."""
path = Path(path)
path.parent.mkdir(parents=True, exist_ok=True)
if not path.exists():
with urllib.request.urlopen(url) as response, open(path, 'wb') as f:
shutil.copyfileobj(response, f)
if digest is not None:
file_digest = hashlib.sha256(open(path, 'rb').read()).hexdigest()
if digest != file_digest:
raise OSError(f'hash of {path} (url: {url}) failed to validate')
return path
@contextmanager
def train_mode(model, mode=True):
"""A context manager that places a model into training mode and restores
the previous mode on exit."""
modes = [module.training for module in model.modules()]
try:
yield model.train(mode)
finally:
for i, module in enumerate(model.modules()):
module.training = modes[i]
def eval_mode(model):
"""A context manager that places a model into evaluation mode and restores
the previous mode on exit."""
return train_mode(model, False)
@torch.no_grad()
def ema_update(model, averaged_model, decay):
"""Incorporates updated model parameters into an exponential moving averaged
version of a model. It should be called after each optimizer step."""
model_params = dict(model.named_parameters())
averaged_params = dict(averaged_model.named_parameters())
assert model_params.keys() == averaged_params.keys()
for name, param in model_params.items():
averaged_params[name].mul_(decay).add_(param, alpha=1 - decay)
model_buffers = dict(model.named_buffers())
averaged_buffers = dict(averaged_model.named_buffers())
assert model_buffers.keys() == averaged_buffers.keys()
for name, buf in model_buffers.items():
averaged_buffers[name].copy_(buf)
class EMAWarmup:
"""Implements an EMA warmup using an inverse decay schedule.
If inv_gamma=1 and power=1, implements a simple average. inv_gamma=1, power=2/3 are
good values for models you plan to train for a million or more steps (reaches decay
factor 0.999 at 31.6K steps, 0.9999 at 1M steps), inv_gamma=1, power=3/4 for models
you plan to train for less (reaches decay factor 0.999 at 10K steps, 0.9999 at
215.4k steps).
Args:
inv_gamma (float): Inverse multiplicative factor of EMA warmup. Default: 1.
power (float): Exponential factor of EMA warmup. Default: 1.
min_value (float): The minimum EMA decay rate. Default: 0.
max_value (float): The maximum EMA decay rate. Default: 1.
start_at (int): The epoch to start averaging at. Default: 0.
last_epoch (int): The index of last epoch. Default: 0.
"""
def __init__(self, inv_gamma=1., power=1., min_value=0., max_value=1., start_at=0,
last_epoch=0):
self.inv_gamma = inv_gamma
self.power = power
self.min_value = min_value
self.max_value = max_value
self.start_at = start_at
self.last_epoch = last_epoch
def state_dict(self):
"""Returns the state of the class as a :class:`dict`."""
return dict(self.__dict__.items())
def load_state_dict(self, state_dict):
"""Loads the class's state.
Args:
state_dict (dict): scaler state. Should be an object returned
from a call to :meth:`state_dict`.
"""
self.__dict__.update(state_dict)
def get_value(self):
"""Gets the current EMA decay rate."""
epoch = max(0, self.last_epoch - self.start_at)
value = 1 - (1 + epoch / self.inv_gamma) ** -self.power
return 0. if epoch < 0 else min(self.max_value, max(self.min_value, value))
def step(self):
"""Updates the step count."""
self.last_epoch += 1
class InverseLR(optim.lr_scheduler._LRScheduler):
"""Implements an inverse decay learning rate schedule with an optional exponential
warmup. When last_epoch=-1, sets initial lr as lr.
inv_gamma is the number of steps/epochs required for the learning rate to decay to
(1 / 2)**power of its original value.
Args:
optimizer (Optimizer): Wrapped optimizer.
inv_gamma (float): Inverse multiplicative factor of learning rate decay. Default: 1.
power (float): Exponential factor of learning rate decay. Default: 1.
warmup (float): Exponential warmup factor (0 <= warmup < 1, 0 to disable)
Default: 0.
min_lr (float): The minimum learning rate. Default: 0.
last_epoch (int): The index of last epoch. Default: -1.
verbose (bool): If ``True``, prints a message to stdout for
each update. Default: ``False``.
"""
def __init__(self, optimizer, inv_gamma=1., power=1., warmup=0., min_lr=0.,
last_epoch=-1, verbose=False):
self.inv_gamma = inv_gamma
self.power = power
if not 0. <= warmup < 1:
raise ValueError('Invalid value for warmup')
self.warmup = warmup
self.min_lr = min_lr
super().__init__(optimizer, last_epoch, verbose)
def get_lr(self):
if not self._get_lr_called_within_step:
warnings.warn("To get the last learning rate computed by the scheduler, "
"please use `get_last_lr()`.")
return self._get_closed_form_lr()
def _get_closed_form_lr(self):
warmup = 1 - self.warmup ** (self.last_epoch + 1)
lr_mult = (1 + self.last_epoch / self.inv_gamma) ** -self.power
return [warmup * max(self.min_lr, base_lr * lr_mult)
for base_lr in self.base_lrs]
class ExponentialLR(optim.lr_scheduler._LRScheduler):
"""Implements an exponential learning rate schedule with an optional exponential
warmup. When last_epoch=-1, sets initial lr as lr. Decays the learning rate
continuously by decay (default 0.5) every num_steps steps.
Args:
optimizer (Optimizer): Wrapped optimizer.
num_steps (float): The number of steps to decay the learning rate by decay in.
decay (float): The factor by which to decay the learning rate every num_steps
steps. Default: 0.5.
warmup (float): Exponential warmup factor (0 <= warmup < 1, 0 to disable)
Default: 0.
min_lr (float): The minimum learning rate. Default: 0.
last_epoch (int): The index of last epoch. Default: -1.
verbose (bool): If ``True``, prints a message to stdout for
each update. Default: ``False``.
"""
def __init__(self, optimizer, num_steps, decay=0.5, warmup=0., min_lr=0.,
last_epoch=-1, verbose=False):
self.num_steps = num_steps
self.decay = decay
if not 0. <= warmup < 1:
raise ValueError('Invalid value for warmup')
self.warmup = warmup
self.min_lr = min_lr
super().__init__(optimizer, last_epoch, verbose)
def get_lr(self):
if not self._get_lr_called_within_step:
warnings.warn("To get the last learning rate computed by the scheduler, "
"please use `get_last_lr()`.")
return self._get_closed_form_lr()
def _get_closed_form_lr(self):
warmup = 1 - self.warmup ** (self.last_epoch + 1)
lr_mult = (self.decay ** (1 / self.num_steps)) ** self.last_epoch
return [warmup * max(self.min_lr, base_lr * lr_mult)
for base_lr in self.base_lrs]
def rand_log_normal(shape, loc=0., scale=1., device='cpu', dtype=torch.float32):
"""Draws samples from an lognormal distribution."""
return (torch.randn(shape, device=device, dtype=dtype) * scale + loc).exp()
def rand_log_logistic(shape, loc=0., scale=1., min_value=0., max_value=float('inf'), device='cpu', dtype=torch.float32):
"""Draws samples from an optionally truncated log-logistic distribution."""
min_value = torch.as_tensor(min_value, device=device, dtype=torch.float64)
max_value = torch.as_tensor(max_value, device=device, dtype=torch.float64)
min_cdf = min_value.log().sub(loc).div(scale).sigmoid()
max_cdf = max_value.log().sub(loc).div(scale).sigmoid()
u = torch.rand(shape, device=device, dtype=torch.float64) * (max_cdf - min_cdf) + min_cdf
return u.logit().mul(scale).add(loc).exp().to(dtype)
def rand_log_uniform(shape, min_value, max_value, device='cpu', dtype=torch.float32):
"""Draws samples from an log-uniform distribution."""
min_value = math.log(min_value)
max_value = math.log(max_value)
return (torch.rand(shape, device=device, dtype=dtype) * (max_value - min_value) + min_value).exp()
def rand_v_diffusion(shape, sigma_data=1., min_value=0., max_value=float('inf'), device='cpu', dtype=torch.float32):
"""Draws samples from a truncated v-diffusion training timestep distribution."""
min_cdf = math.atan(min_value / sigma_data) * 2 / math.pi
max_cdf = math.atan(max_value / sigma_data) * 2 / math.pi
u = torch.rand(shape, device=device, dtype=dtype) * (max_cdf - min_cdf) + min_cdf
return torch.tan(u * math.pi / 2) * sigma_data
def rand_split_log_normal(shape, loc, scale_1, scale_2, device='cpu', dtype=torch.float32):
"""Draws samples from a split lognormal distribution."""
n = torch.randn(shape, device=device, dtype=dtype).abs()
u = torch.rand(shape, device=device, dtype=dtype)
n_left = n * -scale_1 + loc
n_right = n * scale_2 + loc
ratio = scale_1 / (scale_1 + scale_2)
return torch.where(u < ratio, n_left, n_right).exp()
class FolderOfImages(data.Dataset):
"""Recursively finds all images in a directory. It does not support
classes/targets."""
IMG_EXTENSIONS = {'.jpg', '.jpeg', '.png', '.ppm', '.bmp', '.pgm', '.tif', '.tiff', '.webp'}
def __init__(self, root, transform=None):
super().__init__()
self.root = Path(root)
self.transform = nn.Identity() if transform is None else transform
self.paths = sorted(path for path in self.root.rglob('*') if path.suffix.lower() in self.IMG_EXTENSIONS)
def __repr__(self):
return f'FolderOfImages(root="{self.root}", len: {len(self)})'
def __len__(self):
return len(self.paths)
def __getitem__(self, key):
path = self.paths[key]
with open(path, 'rb') as f:
image = Image.open(f).convert('RGB')
image = self.transform(image)
return image,
class CSVLogger:
def __init__(self, filename, columns):
self.filename = Path(filename)
self.columns = columns
if self.filename.exists():
self.file = open(self.filename, 'a')
else:
self.file = open(self.filename, 'w')
self.write(*self.columns)
def write(self, *args):
print(*args, sep=',', file=self.file, flush=True)
@contextmanager
def tf32_mode(cudnn=None, matmul=None):
"""A context manager that sets whether TF32 is allowed on cuDNN or matmul."""
cudnn_old = torch.backends.cudnn.allow_tf32
matmul_old = torch.backends.cuda.matmul.allow_tf32
try:
if cudnn is not None:
torch.backends.cudnn.allow_tf32 = cudnn
if matmul is not None:
torch.backends.cuda.matmul.allow_tf32 = matmul
yield
finally:
if cudnn is not None:
torch.backends.cudnn.allow_tf32 = cudnn_old
if matmul is not None:
torch.backends.cuda.matmul.allow_tf32 = matmul_old

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import torch
class LatentFormat:
scale_factor = 1.0
latent_channels = 4
latent_rgb_factors = None
taesd_decoder_name = None
def process_in(self, latent):
return latent * self.scale_factor
def process_out(self, latent):
return latent / self.scale_factor
class SD15(LatentFormat):
def __init__(self, scale_factor=0.18215):
self.scale_factor = scale_factor
self.latent_rgb_factors = [
# R G B
[ 0.3512, 0.2297, 0.3227],
[ 0.3250, 0.4974, 0.2350],
[-0.2829, 0.1762, 0.2721],
[-0.2120, -0.2616, -0.7177]
]
self.taesd_decoder_name = "taesd_decoder"
class SDXL(LatentFormat):
scale_factor = 0.13025
def __init__(self):
self.latent_rgb_factors = [
# R G B
[ 0.3920, 0.4054, 0.4549],
[-0.2634, -0.0196, 0.0653],
[ 0.0568, 0.1687, -0.0755],
[-0.3112, -0.2359, -0.2076]
]
self.taesd_decoder_name = "taesdxl_decoder"
class SDXL_Playground_2_5(LatentFormat):
def __init__(self):
self.scale_factor = 0.5
self.latents_mean = torch.tensor([-1.6574, 1.886, -1.383, 2.5155]).view(1, 4, 1, 1)
self.latents_std = torch.tensor([8.4927, 5.9022, 6.5498, 5.2299]).view(1, 4, 1, 1)
self.latent_rgb_factors = [
# R G B
[ 0.3920, 0.4054, 0.4549],
[-0.2634, -0.0196, 0.0653],
[ 0.0568, 0.1687, -0.0755],
[-0.3112, -0.2359, -0.2076]
]
self.taesd_decoder_name = "taesdxl_decoder"
def process_in(self, latent):
latents_mean = self.latents_mean.to(latent.device, latent.dtype)
latents_std = self.latents_std.to(latent.device, latent.dtype)
return (latent - latents_mean) * self.scale_factor / latents_std
def process_out(self, latent):
latents_mean = self.latents_mean.to(latent.device, latent.dtype)
latents_std = self.latents_std.to(latent.device, latent.dtype)
return latent * latents_std / self.scale_factor + latents_mean
class SD_X4(LatentFormat):
def __init__(self):
self.scale_factor = 0.08333
self.latent_rgb_factors = [
[-0.2340, -0.3863, -0.3257],
[ 0.0994, 0.0885, -0.0908],
[-0.2833, -0.2349, -0.3741],
[ 0.2523, -0.0055, -0.1651]
]
class SC_Prior(LatentFormat):
latent_channels = 16
def __init__(self):
self.scale_factor = 1.0
self.latent_rgb_factors = [
[-0.0326, -0.0204, -0.0127],
[-0.1592, -0.0427, 0.0216],
[ 0.0873, 0.0638, -0.0020],
[-0.0602, 0.0442, 0.1304],
[ 0.0800, -0.0313, -0.1796],
[-0.0810, -0.0638, -0.1581],
[ 0.1791, 0.1180, 0.0967],
[ 0.0740, 0.1416, 0.0432],
[-0.1745, -0.1888, -0.1373],
[ 0.2412, 0.1577, 0.0928],
[ 0.1908, 0.0998, 0.0682],
[ 0.0209, 0.0365, -0.0092],
[ 0.0448, -0.0650, -0.1728],
[-0.1658, -0.1045, -0.1308],
[ 0.0542, 0.1545, 0.1325],
[-0.0352, -0.1672, -0.2541]
]
class SC_B(LatentFormat):
def __init__(self):
self.scale_factor = 1.0 / 0.43
self.latent_rgb_factors = [
[ 0.1121, 0.2006, 0.1023],
[-0.2093, -0.0222, -0.0195],
[-0.3087, -0.1535, 0.0366],
[ 0.0290, -0.1574, -0.4078]
]
class SD3(LatentFormat):
latent_channels = 16
def __init__(self):
self.scale_factor = 1.5305
self.shift_factor = 0.0609
self.latent_rgb_factors = [
[-0.0645, 0.0177, 0.1052],
[ 0.0028, 0.0312, 0.0650],
[ 0.1848, 0.0762, 0.0360],
[ 0.0944, 0.0360, 0.0889],
[ 0.0897, 0.0506, -0.0364],
[-0.0020, 0.1203, 0.0284],
[ 0.0855, 0.0118, 0.0283],
[-0.0539, 0.0658, 0.1047],
[-0.0057, 0.0116, 0.0700],
[-0.0412, 0.0281, -0.0039],
[ 0.1106, 0.1171, 0.1220],
[-0.0248, 0.0682, -0.0481],
[ 0.0815, 0.0846, 0.1207],
[-0.0120, -0.0055, -0.0867],
[-0.0749, -0.0634, -0.0456],
[-0.1418, -0.1457, -0.1259]
]
self.taesd_decoder_name = "taesd3_decoder"
def process_in(self, latent):
return (latent - self.shift_factor) * self.scale_factor
def process_out(self, latent):
return (latent / self.scale_factor) + self.shift_factor
class StableAudio1(LatentFormat):
latent_channels = 64
class Flux(SD3):
def __init__(self):
self.scale_factor = 0.3611
self.shift_factor = 0.1159
self.latent_rgb_factors =[
[-0.0404, 0.0159, 0.0609],
[ 0.0043, 0.0298, 0.0850],
[ 0.0328, -0.0749, -0.0503],
[-0.0245, 0.0085, 0.0549],
[ 0.0966, 0.0894, 0.0530],
[ 0.0035, 0.0399, 0.0123],
[ 0.0583, 0.1184, 0.1262],
[-0.0191, -0.0206, -0.0306],
[-0.0324, 0.0055, 0.1001],
[ 0.0955, 0.0659, -0.0545],
[-0.0504, 0.0231, -0.0013],
[ 0.0500, -0.0008, -0.0088],
[ 0.0982, 0.0941, 0.0976],
[-0.1233, -0.0280, -0.0897],
[-0.0005, -0.0530, -0.0020],
[-0.1273, -0.0932, -0.0680]
]
def process_in(self, latent):
return (latent - self.shift_factor) * self.scale_factor
def process_out(self, latent):
return (latent / self.scale_factor) + self.shift_factor

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# code adapted from: https://github.com/Stability-AI/stable-audio-tools
import torch
from torch import nn
from typing import Literal, Dict, Any
import math
import comfy.ops
ops = comfy.ops.disable_weight_init
def vae_sample(mean, scale):
stdev = nn.functional.softplus(scale) + 1e-4
var = stdev * stdev
logvar = torch.log(var)
latents = torch.randn_like(mean) * stdev + mean
kl = (mean * mean + var - logvar - 1).sum(1).mean()
return latents, kl
class VAEBottleneck(nn.Module):
def __init__(self):
super().__init__()
self.is_discrete = False
def encode(self, x, return_info=False, **kwargs):
info = {}
mean, scale = x.chunk(2, dim=1)
x, kl = vae_sample(mean, scale)
info["kl"] = kl
if return_info:
return x, info
else:
return x
def decode(self, x):
return x
def snake_beta(x, alpha, beta):
return x + (1.0 / (beta + 0.000000001)) * pow(torch.sin(x * alpha), 2)
# Adapted from https://github.com/NVIDIA/BigVGAN/blob/main/activations.py under MIT license
class SnakeBeta(nn.Module):
def __init__(self, in_features, alpha=1.0, alpha_trainable=True, alpha_logscale=True):
super(SnakeBeta, self).__init__()
self.in_features = in_features
# initialize alpha
self.alpha_logscale = alpha_logscale
if self.alpha_logscale: # log scale alphas initialized to zeros
self.alpha = nn.Parameter(torch.zeros(in_features) * alpha)
self.beta = nn.Parameter(torch.zeros(in_features) * alpha)
else: # linear scale alphas initialized to ones
self.alpha = nn.Parameter(torch.ones(in_features) * alpha)
self.beta = nn.Parameter(torch.ones(in_features) * alpha)
# self.alpha.requires_grad = alpha_trainable
# self.beta.requires_grad = alpha_trainable
self.no_div_by_zero = 0.000000001
def forward(self, x):
alpha = self.alpha.unsqueeze(0).unsqueeze(-1).to(x.device) # line up with x to [B, C, T]
beta = self.beta.unsqueeze(0).unsqueeze(-1).to(x.device)
if self.alpha_logscale:
alpha = torch.exp(alpha)
beta = torch.exp(beta)
x = snake_beta(x, alpha, beta)
return x
def WNConv1d(*args, **kwargs):
try:
return torch.nn.utils.parametrizations.weight_norm(ops.Conv1d(*args, **kwargs))
except:
return torch.nn.utils.weight_norm(ops.Conv1d(*args, **kwargs)) #support pytorch 2.1 and older
def WNConvTranspose1d(*args, **kwargs):
try:
return torch.nn.utils.parametrizations.weight_norm(ops.ConvTranspose1d(*args, **kwargs))
except:
return torch.nn.utils.weight_norm(ops.ConvTranspose1d(*args, **kwargs)) #support pytorch 2.1 and older
def get_activation(activation: Literal["elu", "snake", "none"], antialias=False, channels=None) -> nn.Module:
if activation == "elu":
act = torch.nn.ELU()
elif activation == "snake":
act = SnakeBeta(channels)
elif activation == "none":
act = torch.nn.Identity()
else:
raise ValueError(f"Unknown activation {activation}")
if antialias:
act = Activation1d(act)
return act
class ResidualUnit(nn.Module):
def __init__(self, in_channels, out_channels, dilation, use_snake=False, antialias_activation=False):
super().__init__()
self.dilation = dilation
padding = (dilation * (7-1)) // 2
self.layers = nn.Sequential(
get_activation("snake" if use_snake else "elu", antialias=antialias_activation, channels=out_channels),
WNConv1d(in_channels=in_channels, out_channels=out_channels,
kernel_size=7, dilation=dilation, padding=padding),
get_activation("snake" if use_snake else "elu", antialias=antialias_activation, channels=out_channels),
WNConv1d(in_channels=out_channels, out_channels=out_channels,
kernel_size=1)
)
def forward(self, x):
res = x
#x = checkpoint(self.layers, x)
x = self.layers(x)
return x + res
class EncoderBlock(nn.Module):
def __init__(self, in_channels, out_channels, stride, use_snake=False, antialias_activation=False):
super().__init__()
self.layers = nn.Sequential(
ResidualUnit(in_channels=in_channels,
out_channels=in_channels, dilation=1, use_snake=use_snake),
ResidualUnit(in_channels=in_channels,
out_channels=in_channels, dilation=3, use_snake=use_snake),
ResidualUnit(in_channels=in_channels,
out_channels=in_channels, dilation=9, use_snake=use_snake),
get_activation("snake" if use_snake else "elu", antialias=antialias_activation, channels=in_channels),
WNConv1d(in_channels=in_channels, out_channels=out_channels,
kernel_size=2*stride, stride=stride, padding=math.ceil(stride/2)),
)
def forward(self, x):
return self.layers(x)
class DecoderBlock(nn.Module):
def __init__(self, in_channels, out_channels, stride, use_snake=False, antialias_activation=False, use_nearest_upsample=False):
super().__init__()
if use_nearest_upsample:
upsample_layer = nn.Sequential(
nn.Upsample(scale_factor=stride, mode="nearest"),
WNConv1d(in_channels=in_channels,
out_channels=out_channels,
kernel_size=2*stride,
stride=1,
bias=False,
padding='same')
)
else:
upsample_layer = WNConvTranspose1d(in_channels=in_channels,
out_channels=out_channels,
kernel_size=2*stride, stride=stride, padding=math.ceil(stride/2))
self.layers = nn.Sequential(
get_activation("snake" if use_snake else "elu", antialias=antialias_activation, channels=in_channels),
upsample_layer,
ResidualUnit(in_channels=out_channels, out_channels=out_channels,
dilation=1, use_snake=use_snake),
ResidualUnit(in_channels=out_channels, out_channels=out_channels,
dilation=3, use_snake=use_snake),
ResidualUnit(in_channels=out_channels, out_channels=out_channels,
dilation=9, use_snake=use_snake),
)
def forward(self, x):
return self.layers(x)
class OobleckEncoder(nn.Module):
def __init__(self,
in_channels=2,
channels=128,
latent_dim=32,
c_mults = [1, 2, 4, 8],
strides = [2, 4, 8, 8],
use_snake=False,
antialias_activation=False
):
super().__init__()
c_mults = [1] + c_mults
self.depth = len(c_mults)
layers = [
WNConv1d(in_channels=in_channels, out_channels=c_mults[0] * channels, kernel_size=7, padding=3)
]
for i in range(self.depth-1):
layers += [EncoderBlock(in_channels=c_mults[i]*channels, out_channels=c_mults[i+1]*channels, stride=strides[i], use_snake=use_snake)]
layers += [
get_activation("snake" if use_snake else "elu", antialias=antialias_activation, channels=c_mults[-1] * channels),
WNConv1d(in_channels=c_mults[-1]*channels, out_channels=latent_dim, kernel_size=3, padding=1)
]
self.layers = nn.Sequential(*layers)
def forward(self, x):
return self.layers(x)
class OobleckDecoder(nn.Module):
def __init__(self,
out_channels=2,
channels=128,
latent_dim=32,
c_mults = [1, 2, 4, 8],
strides = [2, 4, 8, 8],
use_snake=False,
antialias_activation=False,
use_nearest_upsample=False,
final_tanh=True):
super().__init__()
c_mults = [1] + c_mults
self.depth = len(c_mults)
layers = [
WNConv1d(in_channels=latent_dim, out_channels=c_mults[-1]*channels, kernel_size=7, padding=3),
]
for i in range(self.depth-1, 0, -1):
layers += [DecoderBlock(
in_channels=c_mults[i]*channels,
out_channels=c_mults[i-1]*channels,
stride=strides[i-1],
use_snake=use_snake,
antialias_activation=antialias_activation,
use_nearest_upsample=use_nearest_upsample
)
]
layers += [
get_activation("snake" if use_snake else "elu", antialias=antialias_activation, channels=c_mults[0] * channels),
WNConv1d(in_channels=c_mults[0] * channels, out_channels=out_channels, kernel_size=7, padding=3, bias=False),
nn.Tanh() if final_tanh else nn.Identity()
]
self.layers = nn.Sequential(*layers)
def forward(self, x):
return self.layers(x)
class AudioOobleckVAE(nn.Module):
def __init__(self,
in_channels=2,
channels=128,
latent_dim=64,
c_mults = [1, 2, 4, 8, 16],
strides = [2, 4, 4, 8, 8],
use_snake=True,
antialias_activation=False,
use_nearest_upsample=False,
final_tanh=False):
super().__init__()
self.encoder = OobleckEncoder(in_channels, channels, latent_dim * 2, c_mults, strides, use_snake, antialias_activation)
self.decoder = OobleckDecoder(in_channels, channels, latent_dim, c_mults, strides, use_snake, antialias_activation,
use_nearest_upsample=use_nearest_upsample, final_tanh=final_tanh)
self.bottleneck = VAEBottleneck()
def encode(self, x):
return self.bottleneck.encode(self.encoder(x))
def decode(self, x):
return self.decoder(self.bottleneck.decode(x))

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# code adapted from: https://github.com/Stability-AI/stable-audio-tools
from comfy.ldm.modules.attention import optimized_attention
import typing as tp
import torch
from einops import rearrange
from torch import nn
from torch.nn import functional as F
import math
import comfy.ops
class FourierFeatures(nn.Module):
def __init__(self, in_features, out_features, std=1., dtype=None, device=None):
super().__init__()
assert out_features % 2 == 0
self.weight = nn.Parameter(torch.empty(
[out_features // 2, in_features], dtype=dtype, device=device))
def forward(self, input):
f = 2 * math.pi * input @ comfy.ops.cast_to_input(self.weight.T, input)
return torch.cat([f.cos(), f.sin()], dim=-1)
# norms
class LayerNorm(nn.Module):
def __init__(self, dim, bias=False, fix_scale=False, dtype=None, device=None):
"""
bias-less layernorm has been shown to be more stable. most newer models have moved towards rmsnorm, also bias-less
"""
super().__init__()
self.gamma = nn.Parameter(torch.empty(dim, dtype=dtype, device=device))
if bias:
self.beta = nn.Parameter(torch.empty(dim, dtype=dtype, device=device))
else:
self.beta = None
def forward(self, x):
beta = self.beta
if beta is not None:
beta = comfy.ops.cast_to_input(beta, x)
return F.layer_norm(x, x.shape[-1:], weight=comfy.ops.cast_to_input(self.gamma, x), bias=beta)
class GLU(nn.Module):
def __init__(
self,
dim_in,
dim_out,
activation,
use_conv = False,
conv_kernel_size = 3,
dtype=None,
device=None,
operations=None,
):
super().__init__()
self.act = activation
self.proj = operations.Linear(dim_in, dim_out * 2, dtype=dtype, device=device) if not use_conv else operations.Conv1d(dim_in, dim_out * 2, conv_kernel_size, padding = (conv_kernel_size // 2), dtype=dtype, device=device)
self.use_conv = use_conv
def forward(self, x):
if self.use_conv:
x = rearrange(x, 'b n d -> b d n')
x = self.proj(x)
x = rearrange(x, 'b d n -> b n d')
else:
x = self.proj(x)
x, gate = x.chunk(2, dim = -1)
return x * self.act(gate)
class AbsolutePositionalEmbedding(nn.Module):
def __init__(self, dim, max_seq_len):
super().__init__()
self.scale = dim ** -0.5
self.max_seq_len = max_seq_len
self.emb = nn.Embedding(max_seq_len, dim)
def forward(self, x, pos = None, seq_start_pos = None):
seq_len, device = x.shape[1], x.device
assert seq_len <= self.max_seq_len, f'you are passing in a sequence length of {seq_len} but your absolute positional embedding has a max sequence length of {self.max_seq_len}'
if pos is None:
pos = torch.arange(seq_len, device = device)
if seq_start_pos is not None:
pos = (pos - seq_start_pos[..., None]).clamp(min = 0)
pos_emb = self.emb(pos)
pos_emb = pos_emb * self.scale
return pos_emb
class ScaledSinusoidalEmbedding(nn.Module):
def __init__(self, dim, theta = 10000):
super().__init__()
assert (dim % 2) == 0, 'dimension must be divisible by 2'
self.scale = nn.Parameter(torch.ones(1) * dim ** -0.5)
half_dim = dim // 2
freq_seq = torch.arange(half_dim).float() / half_dim
inv_freq = theta ** -freq_seq
self.register_buffer('inv_freq', inv_freq, persistent = False)
def forward(self, x, pos = None, seq_start_pos = None):
seq_len, device = x.shape[1], x.device
if pos is None:
pos = torch.arange(seq_len, device = device)
if seq_start_pos is not None:
pos = pos - seq_start_pos[..., None]
emb = torch.einsum('i, j -> i j', pos, self.inv_freq)
emb = torch.cat((emb.sin(), emb.cos()), dim = -1)
return emb * self.scale
class RotaryEmbedding(nn.Module):
def __init__(
self,
dim,
use_xpos = False,
scale_base = 512,
interpolation_factor = 1.,
base = 10000,
base_rescale_factor = 1.,
dtype=None,
device=None,
):
super().__init__()
# proposed by reddit user bloc97, to rescale rotary embeddings to longer sequence length without fine-tuning
# has some connection to NTK literature
# https://www.reddit.com/r/LocalLLaMA/comments/14lz7j5/ntkaware_scaled_rope_allows_llama_models_to_have/
base *= base_rescale_factor ** (dim / (dim - 2))
# inv_freq = 1. / (base ** (torch.arange(0, dim, 2).float() / dim))
self.register_buffer('inv_freq', torch.empty((dim // 2,), device=device, dtype=dtype))
assert interpolation_factor >= 1.
self.interpolation_factor = interpolation_factor
if not use_xpos:
self.register_buffer('scale', None)
return
scale = (torch.arange(0, dim, 2) + 0.4 * dim) / (1.4 * dim)
self.scale_base = scale_base
self.register_buffer('scale', scale)
def forward_from_seq_len(self, seq_len, device, dtype):
# device = self.inv_freq.device
t = torch.arange(seq_len, device=device, dtype=dtype)
return self.forward(t)
def forward(self, t):
# device = self.inv_freq.device
device = t.device
dtype = t.dtype
# t = t.to(torch.float32)
t = t / self.interpolation_factor
freqs = torch.einsum('i , j -> i j', t, comfy.ops.cast_to_input(self.inv_freq, t))
freqs = torch.cat((freqs, freqs), dim = -1)
if self.scale is None:
return freqs, 1.
power = (torch.arange(seq_len, device = device) - (seq_len // 2)) / self.scale_base
scale = comfy.ops.cast_to_input(self.scale, t) ** rearrange(power, 'n -> n 1')
scale = torch.cat((scale, scale), dim = -1)
return freqs, scale
def rotate_half(x):
x = rearrange(x, '... (j d) -> ... j d', j = 2)
x1, x2 = x.unbind(dim = -2)
return torch.cat((-x2, x1), dim = -1)
def apply_rotary_pos_emb(t, freqs, scale = 1):
out_dtype = t.dtype
# cast to float32 if necessary for numerical stability
dtype = t.dtype #reduce(torch.promote_types, (t.dtype, freqs.dtype, torch.float32))
rot_dim, seq_len = freqs.shape[-1], t.shape[-2]
freqs, t = freqs.to(dtype), t.to(dtype)
freqs = freqs[-seq_len:, :]
if t.ndim == 4 and freqs.ndim == 3:
freqs = rearrange(freqs, 'b n d -> b 1 n d')
# partial rotary embeddings, Wang et al. GPT-J
t, t_unrotated = t[..., :rot_dim], t[..., rot_dim:]
t = (t * freqs.cos() * scale) + (rotate_half(t) * freqs.sin() * scale)
t, t_unrotated = t.to(out_dtype), t_unrotated.to(out_dtype)
return torch.cat((t, t_unrotated), dim = -1)
class FeedForward(nn.Module):
def __init__(
self,
dim,
dim_out = None,
mult = 4,
no_bias = False,
glu = True,
use_conv = False,
conv_kernel_size = 3,
zero_init_output = True,
dtype=None,
device=None,
operations=None,
):
super().__init__()
inner_dim = int(dim * mult)
# Default to SwiGLU
activation = nn.SiLU()
dim_out = dim if dim_out is None else dim_out
if glu:
linear_in = GLU(dim, inner_dim, activation, dtype=dtype, device=device, operations=operations)
else:
linear_in = nn.Sequential(
Rearrange('b n d -> b d n') if use_conv else nn.Identity(),
operations.Linear(dim, inner_dim, bias = not no_bias, dtype=dtype, device=device) if not use_conv else operations.Conv1d(dim, inner_dim, conv_kernel_size, padding = (conv_kernel_size // 2), bias = not no_bias, dtype=dtype, device=device),
Rearrange('b n d -> b d n') if use_conv else nn.Identity(),
activation
)
linear_out = operations.Linear(inner_dim, dim_out, bias = not no_bias, dtype=dtype, device=device) if not use_conv else operations.Conv1d(inner_dim, dim_out, conv_kernel_size, padding = (conv_kernel_size // 2), bias = not no_bias, dtype=dtype, device=device)
# # init last linear layer to 0
# if zero_init_output:
# nn.init.zeros_(linear_out.weight)
# if not no_bias:
# nn.init.zeros_(linear_out.bias)
self.ff = nn.Sequential(
linear_in,
Rearrange('b d n -> b n d') if use_conv else nn.Identity(),
linear_out,
Rearrange('b n d -> b d n') if use_conv else nn.Identity(),
)
def forward(self, x):
return self.ff(x)
class Attention(nn.Module):
def __init__(
self,
dim,
dim_heads = 64,
dim_context = None,
causal = False,
zero_init_output=True,
qk_norm = False,
natten_kernel_size = None,
dtype=None,
device=None,
operations=None,
):
super().__init__()
self.dim = dim
self.dim_heads = dim_heads
self.causal = causal
dim_kv = dim_context if dim_context is not None else dim
self.num_heads = dim // dim_heads
self.kv_heads = dim_kv // dim_heads
if dim_context is not None:
self.to_q = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.to_kv = operations.Linear(dim_kv, dim_kv * 2, bias=False, dtype=dtype, device=device)
else:
self.to_qkv = operations.Linear(dim, dim * 3, bias=False, dtype=dtype, device=device)
self.to_out = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
# if zero_init_output:
# nn.init.zeros_(self.to_out.weight)
self.qk_norm = qk_norm
def forward(
self,
x,
context = None,
mask = None,
context_mask = None,
rotary_pos_emb = None,
causal = None
):
h, kv_h, has_context = self.num_heads, self.kv_heads, context is not None
kv_input = context if has_context else x
if hasattr(self, 'to_q'):
# Use separate linear projections for q and k/v
q = self.to_q(x)
q = rearrange(q, 'b n (h d) -> b h n d', h = h)
k, v = self.to_kv(kv_input).chunk(2, dim=-1)
k, v = map(lambda t: rearrange(t, 'b n (h d) -> b h n d', h = kv_h), (k, v))
else:
# Use fused linear projection
q, k, v = self.to_qkv(x).chunk(3, dim=-1)
q, k, v = map(lambda t: rearrange(t, 'b n (h d) -> b h n d', h = h), (q, k, v))
# Normalize q and k for cosine sim attention
if self.qk_norm:
q = F.normalize(q, dim=-1)
k = F.normalize(k, dim=-1)
if rotary_pos_emb is not None and not has_context:
freqs, _ = rotary_pos_emb
q_dtype = q.dtype
k_dtype = k.dtype
q = q.to(torch.float32)
k = k.to(torch.float32)
freqs = freqs.to(torch.float32)
q = apply_rotary_pos_emb(q, freqs)
k = apply_rotary_pos_emb(k, freqs)
q = q.to(q_dtype)
k = k.to(k_dtype)
input_mask = context_mask
if input_mask is None and not has_context:
input_mask = mask
# determine masking
masks = []
final_attn_mask = None # The mask that will be applied to the attention matrix, taking all masks into account
if input_mask is not None:
input_mask = rearrange(input_mask, 'b j -> b 1 1 j')
masks.append(~input_mask)
# Other masks will be added here later
if len(masks) > 0:
final_attn_mask = ~or_reduce(masks)
n, device = q.shape[-2], q.device
causal = self.causal if causal is None else causal
if n == 1 and causal:
causal = False
if h != kv_h:
# Repeat interleave kv_heads to match q_heads
heads_per_kv_head = h // kv_h
k, v = map(lambda t: t.repeat_interleave(heads_per_kv_head, dim = 1), (k, v))
out = optimized_attention(q, k, v, h, skip_reshape=True)
out = self.to_out(out)
if mask is not None:
mask = rearrange(mask, 'b n -> b n 1')
out = out.masked_fill(~mask, 0.)
return out
class ConformerModule(nn.Module):
def __init__(
self,
dim,
norm_kwargs = {},
):
super().__init__()
self.dim = dim
self.in_norm = LayerNorm(dim, **norm_kwargs)
self.pointwise_conv = nn.Conv1d(dim, dim, kernel_size=1, bias=False)
self.glu = GLU(dim, dim, nn.SiLU())
self.depthwise_conv = nn.Conv1d(dim, dim, kernel_size=17, groups=dim, padding=8, bias=False)
self.mid_norm = LayerNorm(dim, **norm_kwargs) # This is a batch norm in the original but I don't like batch norm
self.swish = nn.SiLU()
self.pointwise_conv_2 = nn.Conv1d(dim, dim, kernel_size=1, bias=False)
def forward(self, x):
x = self.in_norm(x)
x = rearrange(x, 'b n d -> b d n')
x = self.pointwise_conv(x)
x = rearrange(x, 'b d n -> b n d')
x = self.glu(x)
x = rearrange(x, 'b n d -> b d n')
x = self.depthwise_conv(x)
x = rearrange(x, 'b d n -> b n d')
x = self.mid_norm(x)
x = self.swish(x)
x = rearrange(x, 'b n d -> b d n')
x = self.pointwise_conv_2(x)
x = rearrange(x, 'b d n -> b n d')
return x
class TransformerBlock(nn.Module):
def __init__(
self,
dim,
dim_heads = 64,
cross_attend = False,
dim_context = None,
global_cond_dim = None,
causal = False,
zero_init_branch_outputs = True,
conformer = False,
layer_ix = -1,
remove_norms = False,
attn_kwargs = {},
ff_kwargs = {},
norm_kwargs = {},
dtype=None,
device=None,
operations=None,
):
super().__init__()
self.dim = dim
self.dim_heads = dim_heads
self.cross_attend = cross_attend
self.dim_context = dim_context
self.causal = causal
self.pre_norm = LayerNorm(dim, dtype=dtype, device=device, **norm_kwargs) if not remove_norms else nn.Identity()
self.self_attn = Attention(
dim,
dim_heads = dim_heads,
causal = causal,
zero_init_output=zero_init_branch_outputs,
dtype=dtype,
device=device,
operations=operations,
**attn_kwargs
)
if cross_attend:
self.cross_attend_norm = LayerNorm(dim, dtype=dtype, device=device, **norm_kwargs) if not remove_norms else nn.Identity()
self.cross_attn = Attention(
dim,
dim_heads = dim_heads,
dim_context=dim_context,
causal = causal,
zero_init_output=zero_init_branch_outputs,
dtype=dtype,
device=device,
operations=operations,
**attn_kwargs
)
self.ff_norm = LayerNorm(dim, dtype=dtype, device=device, **norm_kwargs) if not remove_norms else nn.Identity()
self.ff = FeedForward(dim, zero_init_output=zero_init_branch_outputs, dtype=dtype, device=device, operations=operations,**ff_kwargs)
self.layer_ix = layer_ix
self.conformer = ConformerModule(dim, norm_kwargs=norm_kwargs) if conformer else None
self.global_cond_dim = global_cond_dim
if global_cond_dim is not None:
self.to_scale_shift_gate = nn.Sequential(
nn.SiLU(),
nn.Linear(global_cond_dim, dim * 6, bias=False)
)
nn.init.zeros_(self.to_scale_shift_gate[1].weight)
#nn.init.zeros_(self.to_scale_shift_gate_self[1].bias)
def forward(
self,
x,
context = None,
global_cond=None,
mask = None,
context_mask = None,
rotary_pos_emb = None
):
if self.global_cond_dim is not None and self.global_cond_dim > 0 and global_cond is not None:
scale_self, shift_self, gate_self, scale_ff, shift_ff, gate_ff = self.to_scale_shift_gate(global_cond).unsqueeze(1).chunk(6, dim = -1)
# self-attention with adaLN
residual = x
x = self.pre_norm(x)
x = x * (1 + scale_self) + shift_self
x = self.self_attn(x, mask = mask, rotary_pos_emb = rotary_pos_emb)
x = x * torch.sigmoid(1 - gate_self)
x = x + residual
if context is not None:
x = x + self.cross_attn(self.cross_attend_norm(x), context = context, context_mask = context_mask)
if self.conformer is not None:
x = x + self.conformer(x)
# feedforward with adaLN
residual = x
x = self.ff_norm(x)
x = x * (1 + scale_ff) + shift_ff
x = self.ff(x)
x = x * torch.sigmoid(1 - gate_ff)
x = x + residual
else:
x = x + self.self_attn(self.pre_norm(x), mask = mask, rotary_pos_emb = rotary_pos_emb)
if context is not None:
x = x + self.cross_attn(self.cross_attend_norm(x), context = context, context_mask = context_mask)
if self.conformer is not None:
x = x + self.conformer(x)
x = x + self.ff(self.ff_norm(x))
return x
class ContinuousTransformer(nn.Module):
def __init__(
self,
dim,
depth,
*,
dim_in = None,
dim_out = None,
dim_heads = 64,
cross_attend=False,
cond_token_dim=None,
global_cond_dim=None,
causal=False,
rotary_pos_emb=True,
zero_init_branch_outputs=True,
conformer=False,
use_sinusoidal_emb=False,
use_abs_pos_emb=False,
abs_pos_emb_max_length=10000,
dtype=None,
device=None,
operations=None,
**kwargs
):
super().__init__()
self.dim = dim
self.depth = depth
self.causal = causal
self.layers = nn.ModuleList([])
self.project_in = operations.Linear(dim_in, dim, bias=False, dtype=dtype, device=device) if dim_in is not None else nn.Identity()
self.project_out = operations.Linear(dim, dim_out, bias=False, dtype=dtype, device=device) if dim_out is not None else nn.Identity()
if rotary_pos_emb:
self.rotary_pos_emb = RotaryEmbedding(max(dim_heads // 2, 32), device=device, dtype=dtype)
else:
self.rotary_pos_emb = None
self.use_sinusoidal_emb = use_sinusoidal_emb
if use_sinusoidal_emb:
self.pos_emb = ScaledSinusoidalEmbedding(dim)
self.use_abs_pos_emb = use_abs_pos_emb
if use_abs_pos_emb:
self.pos_emb = AbsolutePositionalEmbedding(dim, abs_pos_emb_max_length)
for i in range(depth):
self.layers.append(
TransformerBlock(
dim,
dim_heads = dim_heads,
cross_attend = cross_attend,
dim_context = cond_token_dim,
global_cond_dim = global_cond_dim,
causal = causal,
zero_init_branch_outputs = zero_init_branch_outputs,
conformer=conformer,
layer_ix=i,
dtype=dtype,
device=device,
operations=operations,
**kwargs
)
)
def forward(
self,
x,
mask = None,
prepend_embeds = None,
prepend_mask = None,
global_cond = None,
return_info = False,
**kwargs
):
batch, seq, device = *x.shape[:2], x.device
info = {
"hidden_states": [],
}
x = self.project_in(x)
if prepend_embeds is not None:
prepend_length, prepend_dim = prepend_embeds.shape[1:]
assert prepend_dim == x.shape[-1], 'prepend dimension must match sequence dimension'
x = torch.cat((prepend_embeds, x), dim = -2)
if prepend_mask is not None or mask is not None:
mask = mask if mask is not None else torch.ones((batch, seq), device = device, dtype = torch.bool)
prepend_mask = prepend_mask if prepend_mask is not None else torch.ones((batch, prepend_length), device = device, dtype = torch.bool)
mask = torch.cat((prepend_mask, mask), dim = -1)
# Attention layers
if self.rotary_pos_emb is not None:
rotary_pos_emb = self.rotary_pos_emb.forward_from_seq_len(x.shape[1], dtype=x.dtype, device=x.device)
else:
rotary_pos_emb = None
if self.use_sinusoidal_emb or self.use_abs_pos_emb:
x = x + self.pos_emb(x)
# Iterate over the transformer layers
for layer in self.layers:
x = layer(x, rotary_pos_emb = rotary_pos_emb, global_cond=global_cond, **kwargs)
# x = checkpoint(layer, x, rotary_pos_emb = rotary_pos_emb, global_cond=global_cond, **kwargs)
if return_info:
info["hidden_states"].append(x)
x = self.project_out(x)
if return_info:
return x, info
return x
class AudioDiffusionTransformer(nn.Module):
def __init__(self,
io_channels=64,
patch_size=1,
embed_dim=1536,
cond_token_dim=768,
project_cond_tokens=False,
global_cond_dim=1536,
project_global_cond=True,
input_concat_dim=0,
prepend_cond_dim=0,
depth=24,
num_heads=24,
transformer_type: tp.Literal["continuous_transformer"] = "continuous_transformer",
global_cond_type: tp.Literal["prepend", "adaLN"] = "prepend",
audio_model="",
dtype=None,
device=None,
operations=None,
**kwargs):
super().__init__()
self.dtype = dtype
self.cond_token_dim = cond_token_dim
# Timestep embeddings
timestep_features_dim = 256
self.timestep_features = FourierFeatures(1, timestep_features_dim, dtype=dtype, device=device)
self.to_timestep_embed = nn.Sequential(
operations.Linear(timestep_features_dim, embed_dim, bias=True, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(embed_dim, embed_dim, bias=True, dtype=dtype, device=device),
)
if cond_token_dim > 0:
# Conditioning tokens
cond_embed_dim = cond_token_dim if not project_cond_tokens else embed_dim
self.to_cond_embed = nn.Sequential(
operations.Linear(cond_token_dim, cond_embed_dim, bias=False, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(cond_embed_dim, cond_embed_dim, bias=False, dtype=dtype, device=device)
)
else:
cond_embed_dim = 0
if global_cond_dim > 0:
# Global conditioning
global_embed_dim = global_cond_dim if not project_global_cond else embed_dim
self.to_global_embed = nn.Sequential(
operations.Linear(global_cond_dim, global_embed_dim, bias=False, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(global_embed_dim, global_embed_dim, bias=False, dtype=dtype, device=device)
)
if prepend_cond_dim > 0:
# Prepend conditioning
self.to_prepend_embed = nn.Sequential(
operations.Linear(prepend_cond_dim, embed_dim, bias=False, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(embed_dim, embed_dim, bias=False, dtype=dtype, device=device)
)
self.input_concat_dim = input_concat_dim
dim_in = io_channels + self.input_concat_dim
self.patch_size = patch_size
# Transformer
self.transformer_type = transformer_type
self.global_cond_type = global_cond_type
if self.transformer_type == "continuous_transformer":
global_dim = None
if self.global_cond_type == "adaLN":
# The global conditioning is projected to the embed_dim already at this point
global_dim = embed_dim
self.transformer = ContinuousTransformer(
dim=embed_dim,
depth=depth,
dim_heads=embed_dim // num_heads,
dim_in=dim_in * patch_size,
dim_out=io_channels * patch_size,
cross_attend = cond_token_dim > 0,
cond_token_dim = cond_embed_dim,
global_cond_dim=global_dim,
dtype=dtype,
device=device,
operations=operations,
**kwargs
)
else:
raise ValueError(f"Unknown transformer type: {self.transformer_type}")
self.preprocess_conv = operations.Conv1d(dim_in, dim_in, 1, bias=False, dtype=dtype, device=device)
self.postprocess_conv = operations.Conv1d(io_channels, io_channels, 1, bias=False, dtype=dtype, device=device)
def _forward(
self,
x,
t,
mask=None,
cross_attn_cond=None,
cross_attn_cond_mask=None,
input_concat_cond=None,
global_embed=None,
prepend_cond=None,
prepend_cond_mask=None,
return_info=False,
**kwargs):
if cross_attn_cond is not None:
cross_attn_cond = self.to_cond_embed(cross_attn_cond)
if global_embed is not None:
# Project the global conditioning to the embedding dimension
global_embed = self.to_global_embed(global_embed)
prepend_inputs = None
prepend_mask = None
prepend_length = 0
if prepend_cond is not None:
# Project the prepend conditioning to the embedding dimension
prepend_cond = self.to_prepend_embed(prepend_cond)
prepend_inputs = prepend_cond
if prepend_cond_mask is not None:
prepend_mask = prepend_cond_mask
if input_concat_cond is not None:
# Interpolate input_concat_cond to the same length as x
if input_concat_cond.shape[2] != x.shape[2]:
input_concat_cond = F.interpolate(input_concat_cond, (x.shape[2], ), mode='nearest')
x = torch.cat([x, input_concat_cond], dim=1)
# Get the batch of timestep embeddings
timestep_embed = self.to_timestep_embed(self.timestep_features(t[:, None]).to(x.dtype)) # (b, embed_dim)
# Timestep embedding is considered a global embedding. Add to the global conditioning if it exists
if global_embed is not None:
global_embed = global_embed + timestep_embed
else:
global_embed = timestep_embed
# Add the global_embed to the prepend inputs if there is no global conditioning support in the transformer
if self.global_cond_type == "prepend":
if prepend_inputs is None:
# Prepend inputs are just the global embed, and the mask is all ones
prepend_inputs = global_embed.unsqueeze(1)
prepend_mask = torch.ones((x.shape[0], 1), device=x.device, dtype=torch.bool)
else:
# Prepend inputs are the prepend conditioning + the global embed
prepend_inputs = torch.cat([prepend_inputs, global_embed.unsqueeze(1)], dim=1)
prepend_mask = torch.cat([prepend_mask, torch.ones((x.shape[0], 1), device=x.device, dtype=torch.bool)], dim=1)
prepend_length = prepend_inputs.shape[1]
x = self.preprocess_conv(x) + x
x = rearrange(x, "b c t -> b t c")
extra_args = {}
if self.global_cond_type == "adaLN":
extra_args["global_cond"] = global_embed
if self.patch_size > 1:
x = rearrange(x, "b (t p) c -> b t (c p)", p=self.patch_size)
if self.transformer_type == "x-transformers":
output = self.transformer(x, prepend_embeds=prepend_inputs, context=cross_attn_cond, context_mask=cross_attn_cond_mask, mask=mask, prepend_mask=prepend_mask, **extra_args, **kwargs)
elif self.transformer_type == "continuous_transformer":
output = self.transformer(x, prepend_embeds=prepend_inputs, context=cross_attn_cond, context_mask=cross_attn_cond_mask, mask=mask, prepend_mask=prepend_mask, return_info=return_info, **extra_args, **kwargs)
if return_info:
output, info = output
elif self.transformer_type == "mm_transformer":
output = self.transformer(x, context=cross_attn_cond, mask=mask, context_mask=cross_attn_cond_mask, **extra_args, **kwargs)
output = rearrange(output, "b t c -> b c t")[:,:,prepend_length:]
if self.patch_size > 1:
output = rearrange(output, "b (c p) t -> b c (t p)", p=self.patch_size)
output = self.postprocess_conv(output) + output
if return_info:
return output, info
return output
def forward(
self,
x,
timestep,
context=None,
context_mask=None,
input_concat_cond=None,
global_embed=None,
negative_global_embed=None,
prepend_cond=None,
prepend_cond_mask=None,
mask=None,
return_info=False,
control=None,
transformer_options={},
**kwargs):
return self._forward(
x,
timestep,
cross_attn_cond=context,
cross_attn_cond_mask=context_mask,
input_concat_cond=input_concat_cond,
global_embed=global_embed,
prepend_cond=prepend_cond,
prepend_cond_mask=prepend_cond_mask,
mask=mask,
return_info=return_info,
**kwargs
)

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# code adapted from: https://github.com/Stability-AI/stable-audio-tools
import torch
import torch.nn as nn
from torch import Tensor, einsum
from typing import Any, Callable, Dict, List, Optional, Sequence, Tuple, TypeVar, Union
from einops import rearrange
import math
import comfy.ops
class LearnedPositionalEmbedding(nn.Module):
"""Used for continuous time"""
def __init__(self, dim: int):
super().__init__()
assert (dim % 2) == 0
half_dim = dim // 2
self.weights = nn.Parameter(torch.empty(half_dim))
def forward(self, x: Tensor) -> Tensor:
x = rearrange(x, "b -> b 1")
freqs = x * rearrange(self.weights, "d -> 1 d") * 2 * math.pi
fouriered = torch.cat((freqs.sin(), freqs.cos()), dim=-1)
fouriered = torch.cat((x, fouriered), dim=-1)
return fouriered
def TimePositionalEmbedding(dim: int, out_features: int) -> nn.Module:
return nn.Sequential(
LearnedPositionalEmbedding(dim),
comfy.ops.manual_cast.Linear(in_features=dim + 1, out_features=out_features),
)
class NumberEmbedder(nn.Module):
def __init__(
self,
features: int,
dim: int = 256,
):
super().__init__()
self.features = features
self.embedding = TimePositionalEmbedding(dim=dim, out_features=features)
def forward(self, x: Union[List[float], Tensor]) -> Tensor:
if not torch.is_tensor(x):
device = next(self.embedding.parameters()).device
x = torch.tensor(x, device=device)
assert isinstance(x, Tensor)
shape = x.shape
x = rearrange(x, "... -> (...)")
embedding = self.embedding(x)
x = embedding.view(*shape, self.features)
return x # type: ignore
class Conditioner(nn.Module):
def __init__(
self,
dim: int,
output_dim: int,
project_out: bool = False
):
super().__init__()
self.dim = dim
self.output_dim = output_dim
self.proj_out = nn.Linear(dim, output_dim) if (dim != output_dim or project_out) else nn.Identity()
def forward(self, x):
raise NotImplementedError()
class NumberConditioner(Conditioner):
'''
Conditioner that takes a list of floats, normalizes them for a given range, and returns a list of embeddings
'''
def __init__(self,
output_dim: int,
min_val: float=0,
max_val: float=1
):
super().__init__(output_dim, output_dim)
self.min_val = min_val
self.max_val = max_val
self.embedder = NumberEmbedder(features=output_dim)
def forward(self, floats, device=None):
# Cast the inputs to floats
floats = [float(x) for x in floats]
if device is None:
device = next(self.embedder.parameters()).device
floats = torch.tensor(floats).to(device)
floats = floats.clamp(self.min_val, self.max_val)
normalized_floats = (floats - self.min_val) / (self.max_val - self.min_val)
# Cast floats to same type as embedder
embedder_dtype = next(self.embedder.parameters()).dtype
normalized_floats = normalized_floats.to(embedder_dtype)
float_embeds = self.embedder(normalized_floats).unsqueeze(1)
return [float_embeds, torch.ones(float_embeds.shape[0], 1).to(device)]

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#AuraFlow MMDiT
#Originally written by the AuraFlow Authors
import math
import torch
import torch.nn as nn
import torch.nn.functional as F
from comfy.ldm.modules.attention import optimized_attention
import comfy.ops
def modulate(x, shift, scale):
return x * (1 + scale.unsqueeze(1)) + shift.unsqueeze(1)
def find_multiple(n: int, k: int) -> int:
if n % k == 0:
return n
return n + k - (n % k)
class MLP(nn.Module):
def __init__(self, dim, hidden_dim=None, dtype=None, device=None, operations=None) -> None:
super().__init__()
if hidden_dim is None:
hidden_dim = 4 * dim
n_hidden = int(2 * hidden_dim / 3)
n_hidden = find_multiple(n_hidden, 256)
self.c_fc1 = operations.Linear(dim, n_hidden, bias=False, dtype=dtype, device=device)
self.c_fc2 = operations.Linear(dim, n_hidden, bias=False, dtype=dtype, device=device)
self.c_proj = operations.Linear(n_hidden, dim, bias=False, dtype=dtype, device=device)
def forward(self, x: torch.Tensor) -> torch.Tensor:
x = F.silu(self.c_fc1(x)) * self.c_fc2(x)
x = self.c_proj(x)
return x
class MultiHeadLayerNorm(nn.Module):
def __init__(self, hidden_size=None, eps=1e-5, dtype=None, device=None):
# Copy pasta from https://github.com/huggingface/transformers/blob/e5f71ecaae50ea476d1e12351003790273c4b2ed/src/transformers/models/cohere/modeling_cohere.py#L78
super().__init__()
self.weight = nn.Parameter(torch.empty(hidden_size, dtype=dtype, device=device))
self.variance_epsilon = eps
def forward(self, hidden_states):
input_dtype = hidden_states.dtype
hidden_states = hidden_states.to(torch.float32)
mean = hidden_states.mean(-1, keepdim=True)
variance = (hidden_states - mean).pow(2).mean(-1, keepdim=True)
hidden_states = (hidden_states - mean) * torch.rsqrt(
variance + self.variance_epsilon
)
hidden_states = self.weight.to(torch.float32) * hidden_states
return hidden_states.to(input_dtype)
class SingleAttention(nn.Module):
def __init__(self, dim, n_heads, mh_qknorm=False, dtype=None, device=None, operations=None):
super().__init__()
self.n_heads = n_heads
self.head_dim = dim // n_heads
# this is for cond
self.w1q = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w1k = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w1v = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w1o = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.q_norm1 = (
MultiHeadLayerNorm((self.n_heads, self.head_dim), dtype=dtype, device=device)
if mh_qknorm
else operations.LayerNorm(self.head_dim, elementwise_affine=False, dtype=dtype, device=device)
)
self.k_norm1 = (
MultiHeadLayerNorm((self.n_heads, self.head_dim), dtype=dtype, device=device)
if mh_qknorm
else operations.LayerNorm(self.head_dim, elementwise_affine=False, dtype=dtype, device=device)
)
#@torch.compile()
def forward(self, c):
bsz, seqlen1, _ = c.shape
q, k, v = self.w1q(c), self.w1k(c), self.w1v(c)
q = q.view(bsz, seqlen1, self.n_heads, self.head_dim)
k = k.view(bsz, seqlen1, self.n_heads, self.head_dim)
v = v.view(bsz, seqlen1, self.n_heads, self.head_dim)
q, k = self.q_norm1(q), self.k_norm1(k)
output = optimized_attention(q.permute(0, 2, 1, 3), k.permute(0, 2, 1, 3), v.permute(0, 2, 1, 3), self.n_heads, skip_reshape=True)
c = self.w1o(output)
return c
class DoubleAttention(nn.Module):
def __init__(self, dim, n_heads, mh_qknorm=False, dtype=None, device=None, operations=None):
super().__init__()
self.n_heads = n_heads
self.head_dim = dim // n_heads
# this is for cond
self.w1q = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w1k = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w1v = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w1o = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
# this is for x
self.w2q = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w2k = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w2v = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.w2o = operations.Linear(dim, dim, bias=False, dtype=dtype, device=device)
self.q_norm1 = (
MultiHeadLayerNorm((self.n_heads, self.head_dim), dtype=dtype, device=device)
if mh_qknorm
else operations.LayerNorm(self.head_dim, elementwise_affine=False, dtype=dtype, device=device)
)
self.k_norm1 = (
MultiHeadLayerNorm((self.n_heads, self.head_dim), dtype=dtype, device=device)
if mh_qknorm
else operations.LayerNorm(self.head_dim, elementwise_affine=False, dtype=dtype, device=device)
)
self.q_norm2 = (
MultiHeadLayerNorm((self.n_heads, self.head_dim), dtype=dtype, device=device)
if mh_qknorm
else operations.LayerNorm(self.head_dim, elementwise_affine=False, dtype=dtype, device=device)
)
self.k_norm2 = (
MultiHeadLayerNorm((self.n_heads, self.head_dim), dtype=dtype, device=device)
if mh_qknorm
else operations.LayerNorm(self.head_dim, elementwise_affine=False, dtype=dtype, device=device)
)
#@torch.compile()
def forward(self, c, x):
bsz, seqlen1, _ = c.shape
bsz, seqlen2, _ = x.shape
seqlen = seqlen1 + seqlen2
cq, ck, cv = self.w1q(c), self.w1k(c), self.w1v(c)
cq = cq.view(bsz, seqlen1, self.n_heads, self.head_dim)
ck = ck.view(bsz, seqlen1, self.n_heads, self.head_dim)
cv = cv.view(bsz, seqlen1, self.n_heads, self.head_dim)
cq, ck = self.q_norm1(cq), self.k_norm1(ck)
xq, xk, xv = self.w2q(x), self.w2k(x), self.w2v(x)
xq = xq.view(bsz, seqlen2, self.n_heads, self.head_dim)
xk = xk.view(bsz, seqlen2, self.n_heads, self.head_dim)
xv = xv.view(bsz, seqlen2, self.n_heads, self.head_dim)
xq, xk = self.q_norm2(xq), self.k_norm2(xk)
# concat all
q, k, v = (
torch.cat([cq, xq], dim=1),
torch.cat([ck, xk], dim=1),
torch.cat([cv, xv], dim=1),
)
output = optimized_attention(q.permute(0, 2, 1, 3), k.permute(0, 2, 1, 3), v.permute(0, 2, 1, 3), self.n_heads, skip_reshape=True)
c, x = output.split([seqlen1, seqlen2], dim=1)
c = self.w1o(c)
x = self.w2o(x)
return c, x
class MMDiTBlock(nn.Module):
def __init__(self, dim, heads=8, global_conddim=1024, is_last=False, dtype=None, device=None, operations=None):
super().__init__()
self.normC1 = operations.LayerNorm(dim, elementwise_affine=False, dtype=dtype, device=device)
self.normC2 = operations.LayerNorm(dim, elementwise_affine=False, dtype=dtype, device=device)
if not is_last:
self.mlpC = MLP(dim, hidden_dim=dim * 4, dtype=dtype, device=device, operations=operations)
self.modC = nn.Sequential(
nn.SiLU(),
operations.Linear(global_conddim, 6 * dim, bias=False, dtype=dtype, device=device),
)
else:
self.modC = nn.Sequential(
nn.SiLU(),
operations.Linear(global_conddim, 2 * dim, bias=False, dtype=dtype, device=device),
)
self.normX1 = operations.LayerNorm(dim, elementwise_affine=False, dtype=dtype, device=device)
self.normX2 = operations.LayerNorm(dim, elementwise_affine=False, dtype=dtype, device=device)
self.mlpX = MLP(dim, hidden_dim=dim * 4, dtype=dtype, device=device, operations=operations)
self.modX = nn.Sequential(
nn.SiLU(),
operations.Linear(global_conddim, 6 * dim, bias=False, dtype=dtype, device=device),
)
self.attn = DoubleAttention(dim, heads, dtype=dtype, device=device, operations=operations)
self.is_last = is_last
#@torch.compile()
def forward(self, c, x, global_cond, **kwargs):
cres, xres = c, x
cshift_msa, cscale_msa, cgate_msa, cshift_mlp, cscale_mlp, cgate_mlp = (
self.modC(global_cond).chunk(6, dim=1)
)
c = modulate(self.normC1(c), cshift_msa, cscale_msa)
# xpath
xshift_msa, xscale_msa, xgate_msa, xshift_mlp, xscale_mlp, xgate_mlp = (
self.modX(global_cond).chunk(6, dim=1)
)
x = modulate(self.normX1(x), xshift_msa, xscale_msa)
# attention
c, x = self.attn(c, x)
c = self.normC2(cres + cgate_msa.unsqueeze(1) * c)
c = cgate_mlp.unsqueeze(1) * self.mlpC(modulate(c, cshift_mlp, cscale_mlp))
c = cres + c
x = self.normX2(xres + xgate_msa.unsqueeze(1) * x)
x = xgate_mlp.unsqueeze(1) * self.mlpX(modulate(x, xshift_mlp, xscale_mlp))
x = xres + x
return c, x
class DiTBlock(nn.Module):
# like MMDiTBlock, but it only has X
def __init__(self, dim, heads=8, global_conddim=1024, dtype=None, device=None, operations=None):
super().__init__()
self.norm1 = operations.LayerNorm(dim, elementwise_affine=False, dtype=dtype, device=device)
self.norm2 = operations.LayerNorm(dim, elementwise_affine=False, dtype=dtype, device=device)
self.modCX = nn.Sequential(
nn.SiLU(),
operations.Linear(global_conddim, 6 * dim, bias=False, dtype=dtype, device=device),
)
self.attn = SingleAttention(dim, heads, dtype=dtype, device=device, operations=operations)
self.mlp = MLP(dim, hidden_dim=dim * 4, dtype=dtype, device=device, operations=operations)
#@torch.compile()
def forward(self, cx, global_cond, **kwargs):
cxres = cx
shift_msa, scale_msa, gate_msa, shift_mlp, scale_mlp, gate_mlp = self.modCX(
global_cond
).chunk(6, dim=1)
cx = modulate(self.norm1(cx), shift_msa, scale_msa)
cx = self.attn(cx)
cx = self.norm2(cxres + gate_msa.unsqueeze(1) * cx)
mlpout = self.mlp(modulate(cx, shift_mlp, scale_mlp))
cx = gate_mlp.unsqueeze(1) * mlpout
cx = cxres + cx
return cx
class TimestepEmbedder(nn.Module):
def __init__(self, hidden_size, frequency_embedding_size=256, dtype=None, device=None, operations=None):
super().__init__()
self.mlp = nn.Sequential(
operations.Linear(frequency_embedding_size, hidden_size, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(hidden_size, hidden_size, dtype=dtype, device=device),
)
self.frequency_embedding_size = frequency_embedding_size
@staticmethod
def timestep_embedding(t, dim, max_period=10000):
half = dim // 2
freqs = 1000 * torch.exp(
-math.log(max_period) * torch.arange(start=0, end=half) / half
).to(t.device)
args = t[:, None] * freqs[None]
embedding = torch.cat([torch.cos(args), torch.sin(args)], dim=-1)
if dim % 2:
embedding = torch.cat(
[embedding, torch.zeros_like(embedding[:, :1])], dim=-1
)
return embedding
#@torch.compile()
def forward(self, t, dtype):
t_freq = self.timestep_embedding(t, self.frequency_embedding_size).to(dtype)
t_emb = self.mlp(t_freq)
return t_emb
class MMDiT(nn.Module):
def __init__(
self,
in_channels=4,
out_channels=4,
patch_size=2,
dim=3072,
n_layers=36,
n_double_layers=4,
n_heads=12,
global_conddim=3072,
cond_seq_dim=2048,
max_seq=32 * 32,
device=None,
dtype=None,
operations=None,
):
super().__init__()
self.dtype = dtype
self.t_embedder = TimestepEmbedder(global_conddim, dtype=dtype, device=device, operations=operations)
self.cond_seq_linear = operations.Linear(
cond_seq_dim, dim, bias=False, dtype=dtype, device=device
) # linear for something like text sequence.
self.init_x_linear = operations.Linear(
patch_size * patch_size * in_channels, dim, dtype=dtype, device=device
) # init linear for patchified image.
self.positional_encoding = nn.Parameter(torch.empty(1, max_seq, dim, dtype=dtype, device=device))
self.register_tokens = nn.Parameter(torch.empty(1, 8, dim, dtype=dtype, device=device))
self.double_layers = nn.ModuleList([])
self.single_layers = nn.ModuleList([])
for idx in range(n_double_layers):
self.double_layers.append(
MMDiTBlock(dim, n_heads, global_conddim, is_last=(idx == n_layers - 1), dtype=dtype, device=device, operations=operations)
)
for idx in range(n_double_layers, n_layers):
self.single_layers.append(
DiTBlock(dim, n_heads, global_conddim, dtype=dtype, device=device, operations=operations)
)
self.final_linear = operations.Linear(
dim, patch_size * patch_size * out_channels, bias=False, dtype=dtype, device=device
)
self.modF = nn.Sequential(
nn.SiLU(),
operations.Linear(global_conddim, 2 * dim, bias=False, dtype=dtype, device=device),
)
self.out_channels = out_channels
self.patch_size = patch_size
self.n_double_layers = n_double_layers
self.n_layers = n_layers
self.h_max = round(max_seq**0.5)
self.w_max = round(max_seq**0.5)
@torch.no_grad()
def extend_pe(self, init_dim=(16, 16), target_dim=(64, 64)):
# extend pe
pe_data = self.positional_encoding.data.squeeze(0)[: init_dim[0] * init_dim[1]]
pe_as_2d = pe_data.view(init_dim[0], init_dim[1], -1).permute(2, 0, 1)
# now we need to extend this to target_dim. for this we will use interpolation.
# we will use torch.nn.functional.interpolate
pe_as_2d = F.interpolate(
pe_as_2d.unsqueeze(0), size=target_dim, mode="bilinear"
)
pe_new = pe_as_2d.squeeze(0).permute(1, 2, 0).flatten(0, 1)
self.positional_encoding.data = pe_new.unsqueeze(0).contiguous()
self.h_max, self.w_max = target_dim
print("PE extended to", target_dim)
def pe_selection_index_based_on_dim(self, h, w):
h_p, w_p = h // self.patch_size, w // self.patch_size
original_pe_indexes = torch.arange(self.positional_encoding.shape[1])
original_pe_indexes = original_pe_indexes.view(self.h_max, self.w_max)
starth = self.h_max // 2 - h_p // 2
endh =starth + h_p
startw = self.w_max // 2 - w_p // 2
endw = startw + w_p
original_pe_indexes = original_pe_indexes[
starth:endh, startw:endw
]
return original_pe_indexes.flatten()
def unpatchify(self, x, h, w):
c = self.out_channels
p = self.patch_size
x = x.reshape(shape=(x.shape[0], h, w, p, p, c))
x = torch.einsum("nhwpqc->nchpwq", x)
imgs = x.reshape(shape=(x.shape[0], c, h * p, w * p))
return imgs
def patchify(self, x):
B, C, H, W = x.size()
pad_h = (self.patch_size - H % self.patch_size) % self.patch_size
pad_w = (self.patch_size - W % self.patch_size) % self.patch_size
x = torch.nn.functional.pad(x, (0, pad_w, 0, pad_h), mode='circular')
x = x.view(
B,
C,
(H + 1) // self.patch_size,
self.patch_size,
(W + 1) // self.patch_size,
self.patch_size,
)
x = x.permute(0, 2, 4, 1, 3, 5).flatten(-3).flatten(1, 2)
return x
def apply_pos_embeds(self, x, h, w):
h = (h + 1) // self.patch_size
w = (w + 1) // self.patch_size
max_dim = max(h, w)
cur_dim = self.h_max
pos_encoding = comfy.ops.cast_to_input(self.positional_encoding.reshape(1, cur_dim, cur_dim, -1), x)
if max_dim > cur_dim:
pos_encoding = F.interpolate(pos_encoding.movedim(-1, 1), (max_dim, max_dim), mode="bilinear").movedim(1, -1)
cur_dim = max_dim
from_h = (cur_dim - h) // 2
from_w = (cur_dim - w) // 2
pos_encoding = pos_encoding[:,from_h:from_h+h,from_w:from_w+w]
return x + pos_encoding.reshape(1, -1, self.positional_encoding.shape[-1])
def forward(self, x, timestep, context, **kwargs):
# patchify x, add PE
b, c, h, w = x.shape
# pe_indexes = self.pe_selection_index_based_on_dim(h, w)
# print(pe_indexes, pe_indexes.shape)
x = self.init_x_linear(self.patchify(x)) # B, T_x, D
x = self.apply_pos_embeds(x, h, w)
# x = x + self.positional_encoding[:, : x.size(1)].to(device=x.device, dtype=x.dtype)
# x = x + self.positional_encoding[:, pe_indexes].to(device=x.device, dtype=x.dtype)
# process conditions for MMDiT Blocks
c_seq = context # B, T_c, D_c
t = timestep
c = self.cond_seq_linear(c_seq) # B, T_c, D
c = torch.cat([comfy.ops.cast_to_input(self.register_tokens, c).repeat(c.size(0), 1, 1), c], dim=1)
global_cond = self.t_embedder(t, x.dtype) # B, D
if len(self.double_layers) > 0:
for layer in self.double_layers:
c, x = layer(c, x, global_cond, **kwargs)
if len(self.single_layers) > 0:
c_len = c.size(1)
cx = torch.cat([c, x], dim=1)
for layer in self.single_layers:
cx = layer(cx, global_cond, **kwargs)
x = cx[:, c_len:]
fshift, fscale = self.modF(global_cond).chunk(2, dim=1)
x = modulate(x, fshift, fscale)
x = self.final_linear(x)
x = self.unpatchify(x, (h + 1) // self.patch_size, (w + 1) // self.patch_size)[:,:,:h,:w]
return x

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"""
This file is part of ComfyUI.
Copyright (C) 2024 Stability AI
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
import torch
import torch.nn as nn
from comfy.ldm.modules.attention import optimized_attention
import comfy.ops
class OptimizedAttention(nn.Module):
def __init__(self, c, nhead, dropout=0.0, dtype=None, device=None, operations=None):
super().__init__()
self.heads = nhead
self.to_q = operations.Linear(c, c, bias=True, dtype=dtype, device=device)
self.to_k = operations.Linear(c, c, bias=True, dtype=dtype, device=device)
self.to_v = operations.Linear(c, c, bias=True, dtype=dtype, device=device)
self.out_proj = operations.Linear(c, c, bias=True, dtype=dtype, device=device)
def forward(self, q, k, v):
q = self.to_q(q)
k = self.to_k(k)
v = self.to_v(v)
out = optimized_attention(q, k, v, self.heads)
return self.out_proj(out)
class Attention2D(nn.Module):
def __init__(self, c, nhead, dropout=0.0, dtype=None, device=None, operations=None):
super().__init__()
self.attn = OptimizedAttention(c, nhead, dtype=dtype, device=device, operations=operations)
# self.attn = nn.MultiheadAttention(c, nhead, dropout=dropout, bias=True, batch_first=True, dtype=dtype, device=device)
def forward(self, x, kv, self_attn=False):
orig_shape = x.shape
x = x.view(x.size(0), x.size(1), -1).permute(0, 2, 1) # Bx4xHxW -> Bx(HxW)x4
if self_attn:
kv = torch.cat([x, kv], dim=1)
# x = self.attn(x, kv, kv, need_weights=False)[0]
x = self.attn(x, kv, kv)
x = x.permute(0, 2, 1).view(*orig_shape)
return x
def LayerNorm2d_op(operations):
class LayerNorm2d(operations.LayerNorm):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
def forward(self, x):
return super().forward(x.permute(0, 2, 3, 1)).permute(0, 3, 1, 2)
return LayerNorm2d
class GlobalResponseNorm(nn.Module):
"from https://github.com/facebookresearch/ConvNeXt-V2/blob/3608f67cc1dae164790c5d0aead7bf2d73d9719b/models/utils.py#L105"
def __init__(self, dim, dtype=None, device=None):
super().__init__()
self.gamma = nn.Parameter(torch.empty(1, 1, 1, dim, dtype=dtype, device=device))
self.beta = nn.Parameter(torch.empty(1, 1, 1, dim, dtype=dtype, device=device))
def forward(self, x):
Gx = torch.norm(x, p=2, dim=(1, 2), keepdim=True)
Nx = Gx / (Gx.mean(dim=-1, keepdim=True) + 1e-6)
return comfy.ops.cast_to_input(self.gamma, x) * (x * Nx) + comfy.ops.cast_to_input(self.beta, x) + x
class ResBlock(nn.Module):
def __init__(self, c, c_skip=0, kernel_size=3, dropout=0.0, dtype=None, device=None, operations=None): # , num_heads=4, expansion=2):
super().__init__()
self.depthwise = operations.Conv2d(c, c, kernel_size=kernel_size, padding=kernel_size // 2, groups=c, dtype=dtype, device=device)
# self.depthwise = SAMBlock(c, num_heads, expansion)
self.norm = LayerNorm2d_op(operations)(c, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.channelwise = nn.Sequential(
operations.Linear(c + c_skip, c * 4, dtype=dtype, device=device),
nn.GELU(),
GlobalResponseNorm(c * 4, dtype=dtype, device=device),
nn.Dropout(dropout),
operations.Linear(c * 4, c, dtype=dtype, device=device)
)
def forward(self, x, x_skip=None):
x_res = x
x = self.norm(self.depthwise(x))
if x_skip is not None:
x = torch.cat([x, x_skip], dim=1)
x = self.channelwise(x.permute(0, 2, 3, 1)).permute(0, 3, 1, 2)
return x + x_res
class AttnBlock(nn.Module):
def __init__(self, c, c_cond, nhead, self_attn=True, dropout=0.0, dtype=None, device=None, operations=None):
super().__init__()
self.self_attn = self_attn
self.norm = LayerNorm2d_op(operations)(c, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.attention = Attention2D(c, nhead, dropout, dtype=dtype, device=device, operations=operations)
self.kv_mapper = nn.Sequential(
nn.SiLU(),
operations.Linear(c_cond, c, dtype=dtype, device=device)
)
def forward(self, x, kv):
kv = self.kv_mapper(kv)
x = x + self.attention(self.norm(x), kv, self_attn=self.self_attn)
return x
class FeedForwardBlock(nn.Module):
def __init__(self, c, dropout=0.0, dtype=None, device=None, operations=None):
super().__init__()
self.norm = LayerNorm2d_op(operations)(c, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.channelwise = nn.Sequential(
operations.Linear(c, c * 4, dtype=dtype, device=device),
nn.GELU(),
GlobalResponseNorm(c * 4, dtype=dtype, device=device),
nn.Dropout(dropout),
operations.Linear(c * 4, c, dtype=dtype, device=device)
)
def forward(self, x):
x = x + self.channelwise(self.norm(x).permute(0, 2, 3, 1)).permute(0, 3, 1, 2)
return x
class TimestepBlock(nn.Module):
def __init__(self, c, c_timestep, conds=['sca'], dtype=None, device=None, operations=None):
super().__init__()
self.mapper = operations.Linear(c_timestep, c * 2, dtype=dtype, device=device)
self.conds = conds
for cname in conds:
setattr(self, f"mapper_{cname}", operations.Linear(c_timestep, c * 2, dtype=dtype, device=device))
def forward(self, x, t):
t = t.chunk(len(self.conds) + 1, dim=1)
a, b = self.mapper(t[0])[:, :, None, None].chunk(2, dim=1)
for i, c in enumerate(self.conds):
ac, bc = getattr(self, f"mapper_{c}")(t[i + 1])[:, :, None, None].chunk(2, dim=1)
a, b = a + ac, b + bc
return x * (1 + a) + b

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"""
This file is part of ComfyUI.
Copyright (C) 2024 Stability AI
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
import torch
import torchvision
from torch import nn
from .common import LayerNorm2d_op
class CNetResBlock(nn.Module):
def __init__(self, c, dtype=None, device=None, operations=None):
super().__init__()
self.blocks = nn.Sequential(
LayerNorm2d_op(operations)(c, dtype=dtype, device=device),
nn.GELU(),
operations.Conv2d(c, c, kernel_size=3, padding=1),
LayerNorm2d_op(operations)(c, dtype=dtype, device=device),
nn.GELU(),
operations.Conv2d(c, c, kernel_size=3, padding=1),
)
def forward(self, x):
return x + self.blocks(x)
class ControlNet(nn.Module):
def __init__(self, c_in=3, c_proj=2048, proj_blocks=None, bottleneck_mode=None, dtype=None, device=None, operations=nn):
super().__init__()
if bottleneck_mode is None:
bottleneck_mode = 'effnet'
self.proj_blocks = proj_blocks
if bottleneck_mode == 'effnet':
embd_channels = 1280
self.backbone = torchvision.models.efficientnet_v2_s().features.eval()
if c_in != 3:
in_weights = self.backbone[0][0].weight.data
self.backbone[0][0] = operations.Conv2d(c_in, 24, kernel_size=3, stride=2, bias=False, dtype=dtype, device=device)
if c_in > 3:
# nn.init.constant_(self.backbone[0][0].weight, 0)
self.backbone[0][0].weight.data[:, :3] = in_weights[:, :3].clone()
else:
self.backbone[0][0].weight.data = in_weights[:, :c_in].clone()
elif bottleneck_mode == 'simple':
embd_channels = c_in
self.backbone = nn.Sequential(
operations.Conv2d(embd_channels, embd_channels * 4, kernel_size=3, padding=1, dtype=dtype, device=device),
nn.LeakyReLU(0.2, inplace=True),
operations.Conv2d(embd_channels * 4, embd_channels, kernel_size=3, padding=1, dtype=dtype, device=device),
)
elif bottleneck_mode == 'large':
self.backbone = nn.Sequential(
operations.Conv2d(c_in, 4096 * 4, kernel_size=1, dtype=dtype, device=device),
nn.LeakyReLU(0.2, inplace=True),
operations.Conv2d(4096 * 4, 1024, kernel_size=1, dtype=dtype, device=device),
*[CNetResBlock(1024, dtype=dtype, device=device, operations=operations) for _ in range(8)],
operations.Conv2d(1024, 1280, kernel_size=1, dtype=dtype, device=device),
)
embd_channels = 1280
else:
raise ValueError(f'Unknown bottleneck mode: {bottleneck_mode}')
self.projections = nn.ModuleList()
for _ in range(len(proj_blocks)):
self.projections.append(nn.Sequential(
operations.Conv2d(embd_channels, embd_channels, kernel_size=1, bias=False, dtype=dtype, device=device),
nn.LeakyReLU(0.2, inplace=True),
operations.Conv2d(embd_channels, c_proj, kernel_size=1, bias=False, dtype=dtype, device=device),
))
# nn.init.constant_(self.projections[-1][-1].weight, 0) # zero output projection
self.xl = False
self.input_channels = c_in
self.unshuffle_amount = 8
def forward(self, x):
x = self.backbone(x)
proj_outputs = [None for _ in range(max(self.proj_blocks) + 1)]
for i, idx in enumerate(self.proj_blocks):
proj_outputs[idx] = self.projections[i](x)
return {"input": proj_outputs[::-1]}

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"""
This file is part of ComfyUI.
Copyright (C) 2024 Stability AI
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
import torch
from torch import nn
from torch.autograd import Function
class vector_quantize(Function):
@staticmethod
def forward(ctx, x, codebook):
with torch.no_grad():
codebook_sqr = torch.sum(codebook ** 2, dim=1)
x_sqr = torch.sum(x ** 2, dim=1, keepdim=True)
dist = torch.addmm(codebook_sqr + x_sqr, x, codebook.t(), alpha=-2.0, beta=1.0)
_, indices = dist.min(dim=1)
ctx.save_for_backward(indices, codebook)
ctx.mark_non_differentiable(indices)
nn = torch.index_select(codebook, 0, indices)
return nn, indices
@staticmethod
def backward(ctx, grad_output, grad_indices):
grad_inputs, grad_codebook = None, None
if ctx.needs_input_grad[0]:
grad_inputs = grad_output.clone()
if ctx.needs_input_grad[1]:
# Gradient wrt. the codebook
indices, codebook = ctx.saved_tensors
grad_codebook = torch.zeros_like(codebook)
grad_codebook.index_add_(0, indices, grad_output)
return (grad_inputs, grad_codebook)
class VectorQuantize(nn.Module):
def __init__(self, embedding_size, k, ema_decay=0.99, ema_loss=False):
"""
Takes an input of variable size (as long as the last dimension matches the embedding size).
Returns one tensor containing the nearest neigbour embeddings to each of the inputs,
with the same size as the input, vq and commitment components for the loss as a touple
in the second output and the indices of the quantized vectors in the third:
quantized, (vq_loss, commit_loss), indices
"""
super(VectorQuantize, self).__init__()
self.codebook = nn.Embedding(k, embedding_size)
self.codebook.weight.data.uniform_(-1./k, 1./k)
self.vq = vector_quantize.apply
self.ema_decay = ema_decay
self.ema_loss = ema_loss
if ema_loss:
self.register_buffer('ema_element_count', torch.ones(k))
self.register_buffer('ema_weight_sum', torch.zeros_like(self.codebook.weight))
def _laplace_smoothing(self, x, epsilon):
n = torch.sum(x)
return ((x + epsilon) / (n + x.size(0) * epsilon) * n)
def _updateEMA(self, z_e_x, indices):
mask = nn.functional.one_hot(indices, self.ema_element_count.size(0)).float()
elem_count = mask.sum(dim=0)
weight_sum = torch.mm(mask.t(), z_e_x)
self.ema_element_count = (self.ema_decay * self.ema_element_count) + ((1-self.ema_decay) * elem_count)
self.ema_element_count = self._laplace_smoothing(self.ema_element_count, 1e-5)
self.ema_weight_sum = (self.ema_decay * self.ema_weight_sum) + ((1-self.ema_decay) * weight_sum)
self.codebook.weight.data = self.ema_weight_sum / self.ema_element_count.unsqueeze(-1)
def idx2vq(self, idx, dim=-1):
q_idx = self.codebook(idx)
if dim != -1:
q_idx = q_idx.movedim(-1, dim)
return q_idx
def forward(self, x, get_losses=True, dim=-1):
if dim != -1:
x = x.movedim(dim, -1)
z_e_x = x.contiguous().view(-1, x.size(-1)) if len(x.shape) > 2 else x
z_q_x, indices = self.vq(z_e_x, self.codebook.weight.detach())
vq_loss, commit_loss = None, None
if self.ema_loss and self.training:
self._updateEMA(z_e_x.detach(), indices.detach())
# pick the graded embeddings after updating the codebook in order to have a more accurate commitment loss
z_q_x_grd = torch.index_select(self.codebook.weight, dim=0, index=indices)
if get_losses:
vq_loss = (z_q_x_grd - z_e_x.detach()).pow(2).mean()
commit_loss = (z_e_x - z_q_x_grd.detach()).pow(2).mean()
z_q_x = z_q_x.view(x.shape)
if dim != -1:
z_q_x = z_q_x.movedim(-1, dim)
return z_q_x, (vq_loss, commit_loss), indices.view(x.shape[:-1])
class ResBlock(nn.Module):
def __init__(self, c, c_hidden):
super().__init__()
# depthwise/attention
self.norm1 = nn.LayerNorm(c, elementwise_affine=False, eps=1e-6)
self.depthwise = nn.Sequential(
nn.ReplicationPad2d(1),
nn.Conv2d(c, c, kernel_size=3, groups=c)
)
# channelwise
self.norm2 = nn.LayerNorm(c, elementwise_affine=False, eps=1e-6)
self.channelwise = nn.Sequential(
nn.Linear(c, c_hidden),
nn.GELU(),
nn.Linear(c_hidden, c),
)
self.gammas = nn.Parameter(torch.zeros(6), requires_grad=True)
# Init weights
def _basic_init(module):
if isinstance(module, nn.Linear) or isinstance(module, nn.Conv2d):
torch.nn.init.xavier_uniform_(module.weight)
if module.bias is not None:
nn.init.constant_(module.bias, 0)
self.apply(_basic_init)
def _norm(self, x, norm):
return norm(x.permute(0, 2, 3, 1)).permute(0, 3, 1, 2)
def forward(self, x):
mods = self.gammas
x_temp = self._norm(x, self.norm1) * (1 + mods[0]) + mods[1]
try:
x = x + self.depthwise(x_temp) * mods[2]
except: #operation not implemented for bf16
x_temp = self.depthwise[0](x_temp.float()).to(x.dtype)
x = x + self.depthwise[1](x_temp) * mods[2]
x_temp = self._norm(x, self.norm2) * (1 + mods[3]) + mods[4]
x = x + self.channelwise(x_temp.permute(0, 2, 3, 1)).permute(0, 3, 1, 2) * mods[5]
return x
class StageA(nn.Module):
def __init__(self, levels=2, bottleneck_blocks=12, c_hidden=384, c_latent=4, codebook_size=8192):
super().__init__()
self.c_latent = c_latent
c_levels = [c_hidden // (2 ** i) for i in reversed(range(levels))]
# Encoder blocks
self.in_block = nn.Sequential(
nn.PixelUnshuffle(2),
nn.Conv2d(3 * 4, c_levels[0], kernel_size=1)
)
down_blocks = []
for i in range(levels):
if i > 0:
down_blocks.append(nn.Conv2d(c_levels[i - 1], c_levels[i], kernel_size=4, stride=2, padding=1))
block = ResBlock(c_levels[i], c_levels[i] * 4)
down_blocks.append(block)
down_blocks.append(nn.Sequential(
nn.Conv2d(c_levels[-1], c_latent, kernel_size=1, bias=False),
nn.BatchNorm2d(c_latent), # then normalize them to have mean 0 and std 1
))
self.down_blocks = nn.Sequential(*down_blocks)
self.down_blocks[0]
self.codebook_size = codebook_size
self.vquantizer = VectorQuantize(c_latent, k=codebook_size)
# Decoder blocks
up_blocks = [nn.Sequential(
nn.Conv2d(c_latent, c_levels[-1], kernel_size=1)
)]
for i in range(levels):
for j in range(bottleneck_blocks if i == 0 else 1):
block = ResBlock(c_levels[levels - 1 - i], c_levels[levels - 1 - i] * 4)
up_blocks.append(block)
if i < levels - 1:
up_blocks.append(
nn.ConvTranspose2d(c_levels[levels - 1 - i], c_levels[levels - 2 - i], kernel_size=4, stride=2,
padding=1))
self.up_blocks = nn.Sequential(*up_blocks)
self.out_block = nn.Sequential(
nn.Conv2d(c_levels[0], 3 * 4, kernel_size=1),
nn.PixelShuffle(2),
)
def encode(self, x, quantize=False):
x = self.in_block(x)
x = self.down_blocks(x)
if quantize:
qe, (vq_loss, commit_loss), indices = self.vquantizer.forward(x, dim=1)
return qe, x, indices, vq_loss + commit_loss * 0.25
else:
return x
def decode(self, x):
x = self.up_blocks(x)
x = self.out_block(x)
return x
def forward(self, x, quantize=False):
qe, x, _, vq_loss = self.encode(x, quantize)
x = self.decode(qe)
return x, vq_loss
class Discriminator(nn.Module):
def __init__(self, c_in=3, c_cond=0, c_hidden=512, depth=6):
super().__init__()
d = max(depth - 3, 3)
layers = [
nn.utils.spectral_norm(nn.Conv2d(c_in, c_hidden // (2 ** d), kernel_size=3, stride=2, padding=1)),
nn.LeakyReLU(0.2),
]
for i in range(depth - 1):
c_in = c_hidden // (2 ** max((d - i), 0))
c_out = c_hidden // (2 ** max((d - 1 - i), 0))
layers.append(nn.utils.spectral_norm(nn.Conv2d(c_in, c_out, kernel_size=3, stride=2, padding=1)))
layers.append(nn.InstanceNorm2d(c_out))
layers.append(nn.LeakyReLU(0.2))
self.encoder = nn.Sequential(*layers)
self.shuffle = nn.Conv2d((c_hidden + c_cond) if c_cond > 0 else c_hidden, 1, kernel_size=1)
self.logits = nn.Sigmoid()
def forward(self, x, cond=None):
x = self.encoder(x)
if cond is not None:
cond = cond.view(cond.size(0), cond.size(1), 1, 1, ).expand(-1, -1, x.size(-2), x.size(-1))
x = torch.cat([x, cond], dim=1)
x = self.shuffle(x)
x = self.logits(x)
return x

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"""
This file is part of ComfyUI.
Copyright (C) 2024 Stability AI
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
import math
import torch
from torch import nn
from .common import AttnBlock, LayerNorm2d_op, ResBlock, FeedForwardBlock, TimestepBlock
class StageB(nn.Module):
def __init__(self, c_in=4, c_out=4, c_r=64, patch_size=2, c_cond=1280, c_hidden=[320, 640, 1280, 1280],
nhead=[-1, -1, 20, 20], blocks=[[2, 6, 28, 6], [6, 28, 6, 2]],
block_repeat=[[1, 1, 1, 1], [3, 3, 2, 2]], level_config=['CT', 'CT', 'CTA', 'CTA'], c_clip=1280,
c_clip_seq=4, c_effnet=16, c_pixels=3, kernel_size=3, dropout=[0, 0, 0.0, 0.0], self_attn=True,
t_conds=['sca'], stable_cascade_stage=None, dtype=None, device=None, operations=None):
super().__init__()
self.dtype = dtype
self.c_r = c_r
self.t_conds = t_conds
self.c_clip_seq = c_clip_seq
if not isinstance(dropout, list):
dropout = [dropout] * len(c_hidden)
if not isinstance(self_attn, list):
self_attn = [self_attn] * len(c_hidden)
# CONDITIONING
self.effnet_mapper = nn.Sequential(
operations.Conv2d(c_effnet, c_hidden[0] * 4, kernel_size=1, dtype=dtype, device=device),
nn.GELU(),
operations.Conv2d(c_hidden[0] * 4, c_hidden[0], kernel_size=1, dtype=dtype, device=device),
LayerNorm2d_op(operations)(c_hidden[0], elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
)
self.pixels_mapper = nn.Sequential(
operations.Conv2d(c_pixels, c_hidden[0] * 4, kernel_size=1, dtype=dtype, device=device),
nn.GELU(),
operations.Conv2d(c_hidden[0] * 4, c_hidden[0], kernel_size=1, dtype=dtype, device=device),
LayerNorm2d_op(operations)(c_hidden[0], elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
)
self.clip_mapper = operations.Linear(c_clip, c_cond * c_clip_seq, dtype=dtype, device=device)
self.clip_norm = operations.LayerNorm(c_cond, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.embedding = nn.Sequential(
nn.PixelUnshuffle(patch_size),
operations.Conv2d(c_in * (patch_size ** 2), c_hidden[0], kernel_size=1, dtype=dtype, device=device),
LayerNorm2d_op(operations)(c_hidden[0], elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
)
def get_block(block_type, c_hidden, nhead, c_skip=0, dropout=0, self_attn=True):
if block_type == 'C':
return ResBlock(c_hidden, c_skip, kernel_size=kernel_size, dropout=dropout, dtype=dtype, device=device, operations=operations)
elif block_type == 'A':
return AttnBlock(c_hidden, c_cond, nhead, self_attn=self_attn, dropout=dropout, dtype=dtype, device=device, operations=operations)
elif block_type == 'F':
return FeedForwardBlock(c_hidden, dropout=dropout, dtype=dtype, device=device, operations=operations)
elif block_type == 'T':
return TimestepBlock(c_hidden, c_r, conds=t_conds, dtype=dtype, device=device, operations=operations)
else:
raise Exception(f'Block type {block_type} not supported')
# BLOCKS
# -- down blocks
self.down_blocks = nn.ModuleList()
self.down_downscalers = nn.ModuleList()
self.down_repeat_mappers = nn.ModuleList()
for i in range(len(c_hidden)):
if i > 0:
self.down_downscalers.append(nn.Sequential(
LayerNorm2d_op(operations)(c_hidden[i - 1], elementwise_affine=False, eps=1e-6, dtype=dtype, device=device),
operations.Conv2d(c_hidden[i - 1], c_hidden[i], kernel_size=2, stride=2, dtype=dtype, device=device),
))
else:
self.down_downscalers.append(nn.Identity())
down_block = nn.ModuleList()
for _ in range(blocks[0][i]):
for block_type in level_config[i]:
block = get_block(block_type, c_hidden[i], nhead[i], dropout=dropout[i], self_attn=self_attn[i])
down_block.append(block)
self.down_blocks.append(down_block)
if block_repeat is not None:
block_repeat_mappers = nn.ModuleList()
for _ in range(block_repeat[0][i] - 1):
block_repeat_mappers.append(operations.Conv2d(c_hidden[i], c_hidden[i], kernel_size=1, dtype=dtype, device=device))
self.down_repeat_mappers.append(block_repeat_mappers)
# -- up blocks
self.up_blocks = nn.ModuleList()
self.up_upscalers = nn.ModuleList()
self.up_repeat_mappers = nn.ModuleList()
for i in reversed(range(len(c_hidden))):
if i > 0:
self.up_upscalers.append(nn.Sequential(
LayerNorm2d_op(operations)(c_hidden[i], elementwise_affine=False, eps=1e-6, dtype=dtype, device=device),
operations.ConvTranspose2d(c_hidden[i], c_hidden[i - 1], kernel_size=2, stride=2, dtype=dtype, device=device),
))
else:
self.up_upscalers.append(nn.Identity())
up_block = nn.ModuleList()
for j in range(blocks[1][::-1][i]):
for k, block_type in enumerate(level_config[i]):
c_skip = c_hidden[i] if i < len(c_hidden) - 1 and j == k == 0 else 0
block = get_block(block_type, c_hidden[i], nhead[i], c_skip=c_skip, dropout=dropout[i],
self_attn=self_attn[i])
up_block.append(block)
self.up_blocks.append(up_block)
if block_repeat is not None:
block_repeat_mappers = nn.ModuleList()
for _ in range(block_repeat[1][::-1][i] - 1):
block_repeat_mappers.append(operations.Conv2d(c_hidden[i], c_hidden[i], kernel_size=1, dtype=dtype, device=device))
self.up_repeat_mappers.append(block_repeat_mappers)
# OUTPUT
self.clf = nn.Sequential(
LayerNorm2d_op(operations)(c_hidden[0], elementwise_affine=False, eps=1e-6, dtype=dtype, device=device),
operations.Conv2d(c_hidden[0], c_out * (patch_size ** 2), kernel_size=1, dtype=dtype, device=device),
nn.PixelShuffle(patch_size),
)
# --- WEIGHT INIT ---
# self.apply(self._init_weights) # General init
# nn.init.normal_(self.clip_mapper.weight, std=0.02) # conditionings
# nn.init.normal_(self.effnet_mapper[0].weight, std=0.02) # conditionings
# nn.init.normal_(self.effnet_mapper[2].weight, std=0.02) # conditionings
# nn.init.normal_(self.pixels_mapper[0].weight, std=0.02) # conditionings
# nn.init.normal_(self.pixels_mapper[2].weight, std=0.02) # conditionings
# torch.nn.init.xavier_uniform_(self.embedding[1].weight, 0.02) # inputs
# nn.init.constant_(self.clf[1].weight, 0) # outputs
#
# # blocks
# for level_block in self.down_blocks + self.up_blocks:
# for block in level_block:
# if isinstance(block, ResBlock) or isinstance(block, FeedForwardBlock):
# block.channelwise[-1].weight.data *= np.sqrt(1 / sum(blocks[0]))
# elif isinstance(block, TimestepBlock):
# for layer in block.modules():
# if isinstance(layer, nn.Linear):
# nn.init.constant_(layer.weight, 0)
#
# def _init_weights(self, m):
# if isinstance(m, (nn.Conv2d, nn.Linear)):
# torch.nn.init.xavier_uniform_(m.weight)
# if m.bias is not None:
# nn.init.constant_(m.bias, 0)
def gen_r_embedding(self, r, max_positions=10000):
r = r * max_positions
half_dim = self.c_r // 2
emb = math.log(max_positions) / (half_dim - 1)
emb = torch.arange(half_dim, device=r.device).float().mul(-emb).exp()
emb = r[:, None] * emb[None, :]
emb = torch.cat([emb.sin(), emb.cos()], dim=1)
if self.c_r % 2 == 1: # zero pad
emb = nn.functional.pad(emb, (0, 1), mode='constant')
return emb
def gen_c_embeddings(self, clip):
if len(clip.shape) == 2:
clip = clip.unsqueeze(1)
clip = self.clip_mapper(clip).view(clip.size(0), clip.size(1) * self.c_clip_seq, -1)
clip = self.clip_norm(clip)
return clip
def _down_encode(self, x, r_embed, clip):
level_outputs = []
block_group = zip(self.down_blocks, self.down_downscalers, self.down_repeat_mappers)
for down_block, downscaler, repmap in block_group:
x = downscaler(x)
for i in range(len(repmap) + 1):
for block in down_block:
if isinstance(block, ResBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
ResBlock)):
x = block(x)
elif isinstance(block, AttnBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
AttnBlock)):
x = block(x, clip)
elif isinstance(block, TimestepBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
TimestepBlock)):
x = block(x, r_embed)
else:
x = block(x)
if i < len(repmap):
x = repmap[i](x)
level_outputs.insert(0, x)
return level_outputs
def _up_decode(self, level_outputs, r_embed, clip):
x = level_outputs[0]
block_group = zip(self.up_blocks, self.up_upscalers, self.up_repeat_mappers)
for i, (up_block, upscaler, repmap) in enumerate(block_group):
for j in range(len(repmap) + 1):
for k, block in enumerate(up_block):
if isinstance(block, ResBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
ResBlock)):
skip = level_outputs[i] if k == 0 and i > 0 else None
if skip is not None and (x.size(-1) != skip.size(-1) or x.size(-2) != skip.size(-2)):
x = torch.nn.functional.interpolate(x, skip.shape[-2:], mode='bilinear',
align_corners=True)
x = block(x, skip)
elif isinstance(block, AttnBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
AttnBlock)):
x = block(x, clip)
elif isinstance(block, TimestepBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
TimestepBlock)):
x = block(x, r_embed)
else:
x = block(x)
if j < len(repmap):
x = repmap[j](x)
x = upscaler(x)
return x
def forward(self, x, r, effnet, clip, pixels=None, **kwargs):
if pixels is None:
pixels = x.new_zeros(x.size(0), 3, 8, 8)
# Process the conditioning embeddings
r_embed = self.gen_r_embedding(r).to(dtype=x.dtype)
for c in self.t_conds:
t_cond = kwargs.get(c, torch.zeros_like(r))
r_embed = torch.cat([r_embed, self.gen_r_embedding(t_cond).to(dtype=x.dtype)], dim=1)
clip = self.gen_c_embeddings(clip)
# Model Blocks
x = self.embedding(x)
x = x + self.effnet_mapper(
nn.functional.interpolate(effnet, size=x.shape[-2:], mode='bilinear', align_corners=True))
x = x + nn.functional.interpolate(self.pixels_mapper(pixels), size=x.shape[-2:], mode='bilinear',
align_corners=True)
level_outputs = self._down_encode(x, r_embed, clip)
x = self._up_decode(level_outputs, r_embed, clip)
return self.clf(x)
def update_weights_ema(self, src_model, beta=0.999):
for self_params, src_params in zip(self.parameters(), src_model.parameters()):
self_params.data = self_params.data * beta + src_params.data.clone().to(self_params.device) * (1 - beta)
for self_buffers, src_buffers in zip(self.buffers(), src_model.buffers()):
self_buffers.data = self_buffers.data * beta + src_buffers.data.clone().to(self_buffers.device) * (1 - beta)

273
comfy/ldm/cascade/stage_c.py Normal file
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@@ -0,0 +1,273 @@
"""
This file is part of ComfyUI.
Copyright (C) 2024 Stability AI
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
import torch
from torch import nn
import math
from .common import AttnBlock, LayerNorm2d_op, ResBlock, FeedForwardBlock, TimestepBlock
# from .controlnet import ControlNetDeliverer
class UpDownBlock2d(nn.Module):
def __init__(self, c_in, c_out, mode, enabled=True, dtype=None, device=None, operations=None):
super().__init__()
assert mode in ['up', 'down']
interpolation = nn.Upsample(scale_factor=2 if mode == 'up' else 0.5, mode='bilinear',
align_corners=True) if enabled else nn.Identity()
mapping = operations.Conv2d(c_in, c_out, kernel_size=1, dtype=dtype, device=device)
self.blocks = nn.ModuleList([interpolation, mapping] if mode == 'up' else [mapping, interpolation])
def forward(self, x):
for block in self.blocks:
x = block(x)
return x
class StageC(nn.Module):
def __init__(self, c_in=16, c_out=16, c_r=64, patch_size=1, c_cond=2048, c_hidden=[2048, 2048], nhead=[32, 32],
blocks=[[8, 24], [24, 8]], block_repeat=[[1, 1], [1, 1]], level_config=['CTA', 'CTA'],
c_clip_text=1280, c_clip_text_pooled=1280, c_clip_img=768, c_clip_seq=4, kernel_size=3,
dropout=[0.0, 0.0], self_attn=True, t_conds=['sca', 'crp'], switch_level=[False], stable_cascade_stage=None,
dtype=None, device=None, operations=None):
super().__init__()
self.dtype = dtype
self.c_r = c_r
self.t_conds = t_conds
self.c_clip_seq = c_clip_seq
if not isinstance(dropout, list):
dropout = [dropout] * len(c_hidden)
if not isinstance(self_attn, list):
self_attn = [self_attn] * len(c_hidden)
# CONDITIONING
self.clip_txt_mapper = operations.Linear(c_clip_text, c_cond, dtype=dtype, device=device)
self.clip_txt_pooled_mapper = operations.Linear(c_clip_text_pooled, c_cond * c_clip_seq, dtype=dtype, device=device)
self.clip_img_mapper = operations.Linear(c_clip_img, c_cond * c_clip_seq, dtype=dtype, device=device)
self.clip_norm = operations.LayerNorm(c_cond, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.embedding = nn.Sequential(
nn.PixelUnshuffle(patch_size),
operations.Conv2d(c_in * (patch_size ** 2), c_hidden[0], kernel_size=1, dtype=dtype, device=device),
LayerNorm2d_op(operations)(c_hidden[0], elementwise_affine=False, eps=1e-6)
)
def get_block(block_type, c_hidden, nhead, c_skip=0, dropout=0, self_attn=True):
if block_type == 'C':
return ResBlock(c_hidden, c_skip, kernel_size=kernel_size, dropout=dropout, dtype=dtype, device=device, operations=operations)
elif block_type == 'A':
return AttnBlock(c_hidden, c_cond, nhead, self_attn=self_attn, dropout=dropout, dtype=dtype, device=device, operations=operations)
elif block_type == 'F':
return FeedForwardBlock(c_hidden, dropout=dropout, dtype=dtype, device=device, operations=operations)
elif block_type == 'T':
return TimestepBlock(c_hidden, c_r, conds=t_conds, dtype=dtype, device=device, operations=operations)
else:
raise Exception(f'Block type {block_type} not supported')
# BLOCKS
# -- down blocks
self.down_blocks = nn.ModuleList()
self.down_downscalers = nn.ModuleList()
self.down_repeat_mappers = nn.ModuleList()
for i in range(len(c_hidden)):
if i > 0:
self.down_downscalers.append(nn.Sequential(
LayerNorm2d_op(operations)(c_hidden[i - 1], elementwise_affine=False, eps=1e-6),
UpDownBlock2d(c_hidden[i - 1], c_hidden[i], mode='down', enabled=switch_level[i - 1], dtype=dtype, device=device, operations=operations)
))
else:
self.down_downscalers.append(nn.Identity())
down_block = nn.ModuleList()
for _ in range(blocks[0][i]):
for block_type in level_config[i]:
block = get_block(block_type, c_hidden[i], nhead[i], dropout=dropout[i], self_attn=self_attn[i])
down_block.append(block)
self.down_blocks.append(down_block)
if block_repeat is not None:
block_repeat_mappers = nn.ModuleList()
for _ in range(block_repeat[0][i] - 1):
block_repeat_mappers.append(operations.Conv2d(c_hidden[i], c_hidden[i], kernel_size=1, dtype=dtype, device=device))
self.down_repeat_mappers.append(block_repeat_mappers)
# -- up blocks
self.up_blocks = nn.ModuleList()
self.up_upscalers = nn.ModuleList()
self.up_repeat_mappers = nn.ModuleList()
for i in reversed(range(len(c_hidden))):
if i > 0:
self.up_upscalers.append(nn.Sequential(
LayerNorm2d_op(operations)(c_hidden[i], elementwise_affine=False, eps=1e-6),
UpDownBlock2d(c_hidden[i], c_hidden[i - 1], mode='up', enabled=switch_level[i - 1], dtype=dtype, device=device, operations=operations)
))
else:
self.up_upscalers.append(nn.Identity())
up_block = nn.ModuleList()
for j in range(blocks[1][::-1][i]):
for k, block_type in enumerate(level_config[i]):
c_skip = c_hidden[i] if i < len(c_hidden) - 1 and j == k == 0 else 0
block = get_block(block_type, c_hidden[i], nhead[i], c_skip=c_skip, dropout=dropout[i],
self_attn=self_attn[i])
up_block.append(block)
self.up_blocks.append(up_block)
if block_repeat is not None:
block_repeat_mappers = nn.ModuleList()
for _ in range(block_repeat[1][::-1][i] - 1):
block_repeat_mappers.append(operations.Conv2d(c_hidden[i], c_hidden[i], kernel_size=1, dtype=dtype, device=device))
self.up_repeat_mappers.append(block_repeat_mappers)
# OUTPUT
self.clf = nn.Sequential(
LayerNorm2d_op(operations)(c_hidden[0], elementwise_affine=False, eps=1e-6, dtype=dtype, device=device),
operations.Conv2d(c_hidden[0], c_out * (patch_size ** 2), kernel_size=1, dtype=dtype, device=device),
nn.PixelShuffle(patch_size),
)
# --- WEIGHT INIT ---
# self.apply(self._init_weights) # General init
# nn.init.normal_(self.clip_txt_mapper.weight, std=0.02) # conditionings
# nn.init.normal_(self.clip_txt_pooled_mapper.weight, std=0.02) # conditionings
# nn.init.normal_(self.clip_img_mapper.weight, std=0.02) # conditionings
# torch.nn.init.xavier_uniform_(self.embedding[1].weight, 0.02) # inputs
# nn.init.constant_(self.clf[1].weight, 0) # outputs
#
# # blocks
# for level_block in self.down_blocks + self.up_blocks:
# for block in level_block:
# if isinstance(block, ResBlock) or isinstance(block, FeedForwardBlock):
# block.channelwise[-1].weight.data *= np.sqrt(1 / sum(blocks[0]))
# elif isinstance(block, TimestepBlock):
# for layer in block.modules():
# if isinstance(layer, nn.Linear):
# nn.init.constant_(layer.weight, 0)
#
# def _init_weights(self, m):
# if isinstance(m, (nn.Conv2d, nn.Linear)):
# torch.nn.init.xavier_uniform_(m.weight)
# if m.bias is not None:
# nn.init.constant_(m.bias, 0)
def gen_r_embedding(self, r, max_positions=10000):
r = r * max_positions
half_dim = self.c_r // 2
emb = math.log(max_positions) / (half_dim - 1)
emb = torch.arange(half_dim, device=r.device).float().mul(-emb).exp()
emb = r[:, None] * emb[None, :]
emb = torch.cat([emb.sin(), emb.cos()], dim=1)
if self.c_r % 2 == 1: # zero pad
emb = nn.functional.pad(emb, (0, 1), mode='constant')
return emb
def gen_c_embeddings(self, clip_txt, clip_txt_pooled, clip_img):
clip_txt = self.clip_txt_mapper(clip_txt)
if len(clip_txt_pooled.shape) == 2:
clip_txt_pooled = clip_txt_pooled.unsqueeze(1)
if len(clip_img.shape) == 2:
clip_img = clip_img.unsqueeze(1)
clip_txt_pool = self.clip_txt_pooled_mapper(clip_txt_pooled).view(clip_txt_pooled.size(0), clip_txt_pooled.size(1) * self.c_clip_seq, -1)
clip_img = self.clip_img_mapper(clip_img).view(clip_img.size(0), clip_img.size(1) * self.c_clip_seq, -1)
clip = torch.cat([clip_txt, clip_txt_pool, clip_img], dim=1)
clip = self.clip_norm(clip)
return clip
def _down_encode(self, x, r_embed, clip, cnet=None):
level_outputs = []
block_group = zip(self.down_blocks, self.down_downscalers, self.down_repeat_mappers)
for down_block, downscaler, repmap in block_group:
x = downscaler(x)
for i in range(len(repmap) + 1):
for block in down_block:
if isinstance(block, ResBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
ResBlock)):
if cnet is not None:
next_cnet = cnet.pop()
if next_cnet is not None:
x = x + nn.functional.interpolate(next_cnet, size=x.shape[-2:], mode='bilinear',
align_corners=True).to(x.dtype)
x = block(x)
elif isinstance(block, AttnBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
AttnBlock)):
x = block(x, clip)
elif isinstance(block, TimestepBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
TimestepBlock)):
x = block(x, r_embed)
else:
x = block(x)
if i < len(repmap):
x = repmap[i](x)
level_outputs.insert(0, x)
return level_outputs
def _up_decode(self, level_outputs, r_embed, clip, cnet=None):
x = level_outputs[0]
block_group = zip(self.up_blocks, self.up_upscalers, self.up_repeat_mappers)
for i, (up_block, upscaler, repmap) in enumerate(block_group):
for j in range(len(repmap) + 1):
for k, block in enumerate(up_block):
if isinstance(block, ResBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
ResBlock)):
skip = level_outputs[i] if k == 0 and i > 0 else None
if skip is not None and (x.size(-1) != skip.size(-1) or x.size(-2) != skip.size(-2)):
x = torch.nn.functional.interpolate(x, skip.shape[-2:], mode='bilinear',
align_corners=True)
if cnet is not None:
next_cnet = cnet.pop()
if next_cnet is not None:
x = x + nn.functional.interpolate(next_cnet, size=x.shape[-2:], mode='bilinear',
align_corners=True).to(x.dtype)
x = block(x, skip)
elif isinstance(block, AttnBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
AttnBlock)):
x = block(x, clip)
elif isinstance(block, TimestepBlock) or (
hasattr(block, '_fsdp_wrapped_module') and isinstance(block._fsdp_wrapped_module,
TimestepBlock)):
x = block(x, r_embed)
else:
x = block(x)
if j < len(repmap):
x = repmap[j](x)
x = upscaler(x)
return x
def forward(self, x, r, clip_text, clip_text_pooled, clip_img, control=None, **kwargs):
# Process the conditioning embeddings
r_embed = self.gen_r_embedding(r).to(dtype=x.dtype)
for c in self.t_conds:
t_cond = kwargs.get(c, torch.zeros_like(r))
r_embed = torch.cat([r_embed, self.gen_r_embedding(t_cond).to(dtype=x.dtype)], dim=1)
clip = self.gen_c_embeddings(clip_text, clip_text_pooled, clip_img)
if control is not None:
cnet = control.get("input")
else:
cnet = None
# Model Blocks
x = self.embedding(x)
level_outputs = self._down_encode(x, r_embed, clip, cnet)
x = self._up_decode(level_outputs, r_embed, clip, cnet)
return self.clf(x)
def update_weights_ema(self, src_model, beta=0.999):
for self_params, src_params in zip(self.parameters(), src_model.parameters()):
self_params.data = self_params.data * beta + src_params.data.clone().to(self_params.device) * (1 - beta)
for self_buffers, src_buffers in zip(self.buffers(), src_model.buffers()):
self_buffers.data = self_buffers.data * beta + src_buffers.data.clone().to(self_buffers.device) * (1 - beta)

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"""
This file is part of ComfyUI.
Copyright (C) 2024 Stability AI
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
import torch
import torchvision
from torch import nn
# EfficientNet
class EfficientNetEncoder(nn.Module):
def __init__(self, c_latent=16):
super().__init__()
self.backbone = torchvision.models.efficientnet_v2_s().features.eval()
self.mapper = nn.Sequential(
nn.Conv2d(1280, c_latent, kernel_size=1, bias=False),
nn.BatchNorm2d(c_latent, affine=False), # then normalize them to have mean 0 and std 1
)
self.mean = nn.Parameter(torch.tensor([0.485, 0.456, 0.406]))
self.std = nn.Parameter(torch.tensor([0.229, 0.224, 0.225]))
def forward(self, x):
x = x * 0.5 + 0.5
x = (x - self.mean.view([3,1,1])) / self.std.view([3,1,1])
o = self.mapper(self.backbone(x))
return o
# Fast Decoder for Stage C latents. E.g. 16 x 24 x 24 -> 3 x 192 x 192
class Previewer(nn.Module):
def __init__(self, c_in=16, c_hidden=512, c_out=3):
super().__init__()
self.blocks = nn.Sequential(
nn.Conv2d(c_in, c_hidden, kernel_size=1), # 16 channels to 512 channels
nn.GELU(),
nn.BatchNorm2d(c_hidden),
nn.Conv2d(c_hidden, c_hidden, kernel_size=3, padding=1),
nn.GELU(),
nn.BatchNorm2d(c_hidden),
nn.ConvTranspose2d(c_hidden, c_hidden // 2, kernel_size=2, stride=2), # 16 -> 32
nn.GELU(),
nn.BatchNorm2d(c_hidden // 2),
nn.Conv2d(c_hidden // 2, c_hidden // 2, kernel_size=3, padding=1),
nn.GELU(),
nn.BatchNorm2d(c_hidden // 2),
nn.ConvTranspose2d(c_hidden // 2, c_hidden // 4, kernel_size=2, stride=2), # 32 -> 64
nn.GELU(),
nn.BatchNorm2d(c_hidden // 4),
nn.Conv2d(c_hidden // 4, c_hidden // 4, kernel_size=3, padding=1),
nn.GELU(),
nn.BatchNorm2d(c_hidden // 4),
nn.ConvTranspose2d(c_hidden // 4, c_hidden // 4, kernel_size=2, stride=2), # 64 -> 128
nn.GELU(),
nn.BatchNorm2d(c_hidden // 4),
nn.Conv2d(c_hidden // 4, c_hidden // 4, kernel_size=3, padding=1),
nn.GELU(),
nn.BatchNorm2d(c_hidden // 4),
nn.Conv2d(c_hidden // 4, c_out, kernel_size=1),
)
def forward(self, x):
return (self.blocks(x) - 0.5) * 2.0
class StageC_coder(nn.Module):
def __init__(self):
super().__init__()
self.previewer = Previewer()
self.encoder = EfficientNetEncoder()
def encode(self, x):
return self.encoder(x)
def decode(self, x):
return self.previewer(x)

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import math
from dataclasses import dataclass
import torch
from einops import rearrange
from torch import Tensor, nn
from .math import attention, rope
import comfy.ops
class EmbedND(nn.Module):
def __init__(self, dim: int, theta: int, axes_dim: list):
super().__init__()
self.dim = dim
self.theta = theta
self.axes_dim = axes_dim
def forward(self, ids: Tensor) -> Tensor:
n_axes = ids.shape[-1]
emb = torch.cat(
[rope(ids[..., i], self.axes_dim[i], self.theta) for i in range(n_axes)],
dim=-3,
)
return emb.unsqueeze(1)
def timestep_embedding(t: Tensor, dim, max_period=10000, time_factor: float = 1000.0):
"""
Create sinusoidal timestep embeddings.
:param t: a 1-D Tensor of N indices, one per batch element.
These may be fractional.
:param dim: the dimension of the output.
:param max_period: controls the minimum frequency of the embeddings.
:return: an (N, D) Tensor of positional embeddings.
"""
t = time_factor * t
half = dim // 2
freqs = torch.exp(-math.log(max_period) * torch.arange(start=0, end=half, dtype=torch.float32) / half).to(
t.device
)
args = t[:, None].float() * freqs[None]
embedding = torch.cat([torch.cos(args), torch.sin(args)], dim=-1)
if dim % 2:
embedding = torch.cat([embedding, torch.zeros_like(embedding[:, :1])], dim=-1)
if torch.is_floating_point(t):
embedding = embedding.to(t)
return embedding
class MLPEmbedder(nn.Module):
def __init__(self, in_dim: int, hidden_dim: int, dtype=None, device=None, operations=None):
super().__init__()
self.in_layer = operations.Linear(in_dim, hidden_dim, bias=True, dtype=dtype, device=device)
self.silu = nn.SiLU()
self.out_layer = operations.Linear(hidden_dim, hidden_dim, bias=True, dtype=dtype, device=device)
def forward(self, x: Tensor) -> Tensor:
return self.out_layer(self.silu(self.in_layer(x)))
class RMSNorm(torch.nn.Module):
def __init__(self, dim: int, dtype=None, device=None, operations=None):
super().__init__()
self.scale = nn.Parameter(torch.empty((dim), dtype=dtype, device=device))
def forward(self, x: Tensor):
x_dtype = x.dtype
x = x.float()
rrms = torch.rsqrt(torch.mean(x**2, dim=-1, keepdim=True) + 1e-6)
return (x * rrms).to(dtype=x_dtype) * comfy.ops.cast_to(self.scale, dtype=x_dtype, device=x.device)
class QKNorm(torch.nn.Module):
def __init__(self, dim: int, dtype=None, device=None, operations=None):
super().__init__()
self.query_norm = RMSNorm(dim, dtype=dtype, device=device, operations=operations)
self.key_norm = RMSNorm(dim, dtype=dtype, device=device, operations=operations)
def forward(self, q: Tensor, k: Tensor, v: Tensor) -> tuple:
q = self.query_norm(q)
k = self.key_norm(k)
return q.to(v), k.to(v)
class SelfAttention(nn.Module):
def __init__(self, dim: int, num_heads: int = 8, qkv_bias: bool = False, dtype=None, device=None, operations=None):
super().__init__()
self.num_heads = num_heads
head_dim = dim // num_heads
self.qkv = operations.Linear(dim, dim * 3, bias=qkv_bias, dtype=dtype, device=device)
self.norm = QKNorm(head_dim, dtype=dtype, device=device, operations=operations)
self.proj = operations.Linear(dim, dim, dtype=dtype, device=device)
def forward(self, x: Tensor, pe: Tensor) -> Tensor:
qkv = self.qkv(x)
q, k, v = rearrange(qkv, "B L (K H D) -> K B H L D", K=3, H=self.num_heads)
q, k = self.norm(q, k, v)
x = attention(q, k, v, pe=pe)
x = self.proj(x)
return x
@dataclass
class ModulationOut:
shift: Tensor
scale: Tensor
gate: Tensor
class Modulation(nn.Module):
def __init__(self, dim: int, double: bool, dtype=None, device=None, operations=None):
super().__init__()
self.is_double = double
self.multiplier = 6 if double else 3
self.lin = operations.Linear(dim, self.multiplier * dim, bias=True, dtype=dtype, device=device)
def forward(self, vec: Tensor) -> tuple:
out = self.lin(nn.functional.silu(vec))[:, None, :].chunk(self.multiplier, dim=-1)
return (
ModulationOut(*out[:3]),
ModulationOut(*out[3:]) if self.is_double else None,
)
class DoubleStreamBlock(nn.Module):
def __init__(self, hidden_size: int, num_heads: int, mlp_ratio: float, qkv_bias: bool = False, dtype=None, device=None, operations=None):
super().__init__()
mlp_hidden_dim = int(hidden_size * mlp_ratio)
self.num_heads = num_heads
self.hidden_size = hidden_size
self.img_mod = Modulation(hidden_size, double=True, dtype=dtype, device=device, operations=operations)
self.img_norm1 = operations.LayerNorm(hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.img_attn = SelfAttention(dim=hidden_size, num_heads=num_heads, qkv_bias=qkv_bias, dtype=dtype, device=device, operations=operations)
self.img_norm2 = operations.LayerNorm(hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.img_mlp = nn.Sequential(
operations.Linear(hidden_size, mlp_hidden_dim, bias=True, dtype=dtype, device=device),
nn.GELU(approximate="tanh"),
operations.Linear(mlp_hidden_dim, hidden_size, bias=True, dtype=dtype, device=device),
)
self.txt_mod = Modulation(hidden_size, double=True, dtype=dtype, device=device, operations=operations)
self.txt_norm1 = operations.LayerNorm(hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.txt_attn = SelfAttention(dim=hidden_size, num_heads=num_heads, qkv_bias=qkv_bias, dtype=dtype, device=device, operations=operations)
self.txt_norm2 = operations.LayerNorm(hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.txt_mlp = nn.Sequential(
operations.Linear(hidden_size, mlp_hidden_dim, bias=True, dtype=dtype, device=device),
nn.GELU(approximate="tanh"),
operations.Linear(mlp_hidden_dim, hidden_size, bias=True, dtype=dtype, device=device),
)
def forward(self, img: Tensor, txt: Tensor, vec: Tensor, pe: Tensor):
img_mod1, img_mod2 = self.img_mod(vec)
txt_mod1, txt_mod2 = self.txt_mod(vec)
# prepare image for attention
img_modulated = self.img_norm1(img)
img_modulated = (1 + img_mod1.scale) * img_modulated + img_mod1.shift
img_qkv = self.img_attn.qkv(img_modulated)
img_q, img_k, img_v = rearrange(img_qkv, "B L (K H D) -> K B H L D", K=3, H=self.num_heads)
img_q, img_k = self.img_attn.norm(img_q, img_k, img_v)
# prepare txt for attention
txt_modulated = self.txt_norm1(txt)
txt_modulated = (1 + txt_mod1.scale) * txt_modulated + txt_mod1.shift
txt_qkv = self.txt_attn.qkv(txt_modulated)
txt_q, txt_k, txt_v = rearrange(txt_qkv, "B L (K H D) -> K B H L D", K=3, H=self.num_heads)
txt_q, txt_k = self.txt_attn.norm(txt_q, txt_k, txt_v)
# run actual attention
q = torch.cat((txt_q, img_q), dim=2)
k = torch.cat((txt_k, img_k), dim=2)
v = torch.cat((txt_v, img_v), dim=2)
attn = attention(q, k, v, pe=pe)
txt_attn, img_attn = attn[:, : txt.shape[1]], attn[:, txt.shape[1] :]
# calculate the img bloks
img = img + img_mod1.gate * self.img_attn.proj(img_attn)
img = img + img_mod2.gate * self.img_mlp((1 + img_mod2.scale) * self.img_norm2(img) + img_mod2.shift)
# calculate the txt bloks
txt = txt + txt_mod1.gate * self.txt_attn.proj(txt_attn)
txt = txt + txt_mod2.gate * self.txt_mlp((1 + txt_mod2.scale) * self.txt_norm2(txt) + txt_mod2.shift)
return img, txt
class SingleStreamBlock(nn.Module):
"""
A DiT block with parallel linear layers as described in
https://arxiv.org/abs/2302.05442 and adapted modulation interface.
"""
def __init__(
self,
hidden_size: int,
num_heads: int,
mlp_ratio: float = 4.0,
qk_scale: float = None,
dtype=None,
device=None,
operations=None
):
super().__init__()
self.hidden_dim = hidden_size
self.num_heads = num_heads
head_dim = hidden_size // num_heads
self.scale = qk_scale or head_dim**-0.5
self.mlp_hidden_dim = int(hidden_size * mlp_ratio)
# qkv and mlp_in
self.linear1 = operations.Linear(hidden_size, hidden_size * 3 + self.mlp_hidden_dim, dtype=dtype, device=device)
# proj and mlp_out
self.linear2 = operations.Linear(hidden_size + self.mlp_hidden_dim, hidden_size, dtype=dtype, device=device)
self.norm = QKNorm(head_dim, dtype=dtype, device=device, operations=operations)
self.hidden_size = hidden_size
self.pre_norm = operations.LayerNorm(hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.mlp_act = nn.GELU(approximate="tanh")
self.modulation = Modulation(hidden_size, double=False, dtype=dtype, device=device, operations=operations)
def forward(self, x: Tensor, vec: Tensor, pe: Tensor) -> Tensor:
mod, _ = self.modulation(vec)
x_mod = (1 + mod.scale) * self.pre_norm(x) + mod.shift
qkv, mlp = torch.split(self.linear1(x_mod), [3 * self.hidden_size, self.mlp_hidden_dim], dim=-1)
q, k, v = rearrange(qkv, "B L (K H D) -> K B H L D", K=3, H=self.num_heads)
q, k = self.norm(q, k, v)
# compute attention
attn = attention(q, k, v, pe=pe)
# compute activation in mlp stream, cat again and run second linear layer
output = self.linear2(torch.cat((attn, self.mlp_act(mlp)), 2))
return x + mod.gate * output
class LastLayer(nn.Module):
def __init__(self, hidden_size: int, patch_size: int, out_channels: int, dtype=None, device=None, operations=None):
super().__init__()
self.norm_final = operations.LayerNorm(hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.linear = operations.Linear(hidden_size, patch_size * patch_size * out_channels, bias=True, dtype=dtype, device=device)
self.adaLN_modulation = nn.Sequential(nn.SiLU(), operations.Linear(hidden_size, 2 * hidden_size, bias=True, dtype=dtype, device=device))
def forward(self, x: Tensor, vec: Tensor) -> Tensor:
shift, scale = self.adaLN_modulation(vec).chunk(2, dim=1)
x = (1 + scale[:, None, :]) * self.norm_final(x) + shift[:, None, :]
x = self.linear(x)
return x

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import torch
from einops import rearrange
from torch import Tensor
from comfy.ldm.modules.attention import optimized_attention
import comfy.model_management
def attention(q: Tensor, k: Tensor, v: Tensor, pe: Tensor) -> Tensor:
q, k = apply_rope(q, k, pe)
heads = q.shape[1]
x = optimized_attention(q, k, v, heads, skip_reshape=True)
return x
def rope(pos: Tensor, dim: int, theta: int) -> Tensor:
assert dim % 2 == 0
if comfy.model_management.is_device_mps(pos.device):
device = torch.device("cpu")
else:
device = pos.device
scale = torch.linspace(0, (dim - 2) / dim, steps=dim//2, dtype=torch.float64, device=device)
omega = 1.0 / (theta**scale)
out = torch.einsum("...n,d->...nd", pos.to(dtype=torch.float32, device=device), omega)
out = torch.stack([torch.cos(out), -torch.sin(out), torch.sin(out), torch.cos(out)], dim=-1)
out = rearrange(out, "b n d (i j) -> b n d i j", i=2, j=2)
return out.to(dtype=torch.float32, device=pos.device)
def apply_rope(xq: Tensor, xk: Tensor, freqs_cis: Tensor):
xq_ = xq.float().reshape(*xq.shape[:-1], -1, 1, 2)
xk_ = xk.float().reshape(*xk.shape[:-1], -1, 1, 2)
xq_out = freqs_cis[..., 0] * xq_[..., 0] + freqs_cis[..., 1] * xq_[..., 1]
xk_out = freqs_cis[..., 0] * xk_[..., 0] + freqs_cis[..., 1] * xk_[..., 1]
return xq_out.reshape(*xq.shape).type_as(xq), xk_out.reshape(*xk.shape).type_as(xk)

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#Original code can be found on: https://github.com/black-forest-labs/flux
from dataclasses import dataclass
import torch
from torch import Tensor, nn
from .layers import (
DoubleStreamBlock,
EmbedND,
LastLayer,
MLPEmbedder,
SingleStreamBlock,
timestep_embedding,
)
from einops import rearrange, repeat
@dataclass
class FluxParams:
in_channels: int
vec_in_dim: int
context_in_dim: int
hidden_size: int
mlp_ratio: float
num_heads: int
depth: int
depth_single_blocks: int
axes_dim: list
theta: int
qkv_bias: bool
guidance_embed: bool
class Flux(nn.Module):
"""
Transformer model for flow matching on sequences.
"""
def __init__(self, image_model=None, dtype=None, device=None, operations=None, **kwargs):
super().__init__()
self.dtype = dtype
params = FluxParams(**kwargs)
self.params = params
self.in_channels = params.in_channels
self.out_channels = self.in_channels
if params.hidden_size % params.num_heads != 0:
raise ValueError(
f"Hidden size {params.hidden_size} must be divisible by num_heads {params.num_heads}"
)
pe_dim = params.hidden_size // params.num_heads
if sum(params.axes_dim) != pe_dim:
raise ValueError(f"Got {params.axes_dim} but expected positional dim {pe_dim}")
self.hidden_size = params.hidden_size
self.num_heads = params.num_heads
self.pe_embedder = EmbedND(dim=pe_dim, theta=params.theta, axes_dim=params.axes_dim)
self.img_in = operations.Linear(self.in_channels, self.hidden_size, bias=True, dtype=dtype, device=device)
self.time_in = MLPEmbedder(in_dim=256, hidden_dim=self.hidden_size, dtype=dtype, device=device, operations=operations)
self.vector_in = MLPEmbedder(params.vec_in_dim, self.hidden_size, dtype=dtype, device=device, operations=operations)
self.guidance_in = (
MLPEmbedder(in_dim=256, hidden_dim=self.hidden_size, dtype=dtype, device=device, operations=operations) if params.guidance_embed else nn.Identity()
)
self.txt_in = operations.Linear(params.context_in_dim, self.hidden_size, dtype=dtype, device=device)
self.double_blocks = nn.ModuleList(
[
DoubleStreamBlock(
self.hidden_size,
self.num_heads,
mlp_ratio=params.mlp_ratio,
qkv_bias=params.qkv_bias,
dtype=dtype, device=device, operations=operations
)
for _ in range(params.depth)
]
)
self.single_blocks = nn.ModuleList(
[
SingleStreamBlock(self.hidden_size, self.num_heads, mlp_ratio=params.mlp_ratio, dtype=dtype, device=device, operations=operations)
for _ in range(params.depth_single_blocks)
]
)
self.final_layer = LastLayer(self.hidden_size, 1, self.out_channels, dtype=dtype, device=device, operations=operations)
def forward_orig(
self,
img: Tensor,
img_ids: Tensor,
txt: Tensor,
txt_ids: Tensor,
timesteps: Tensor,
y: Tensor,
guidance: Tensor = None,
) -> Tensor:
if img.ndim != 3 or txt.ndim != 3:
raise ValueError("Input img and txt tensors must have 3 dimensions.")
# running on sequences img
img = self.img_in(img)
vec = self.time_in(timestep_embedding(timesteps, 256).to(img.dtype))
if self.params.guidance_embed:
if guidance is None:
raise ValueError("Didn't get guidance strength for guidance distilled model.")
vec = vec + self.guidance_in(timestep_embedding(guidance, 256).to(img.dtype))
vec = vec + self.vector_in(y)
txt = self.txt_in(txt)
ids = torch.cat((txt_ids, img_ids), dim=1)
pe = self.pe_embedder(ids)
for block in self.double_blocks:
img, txt = block(img=img, txt=txt, vec=vec, pe=pe)
img = torch.cat((txt, img), 1)
for block in self.single_blocks:
img = block(img, vec=vec, pe=pe)
img = img[:, txt.shape[1] :, ...]
img = self.final_layer(img, vec) # (N, T, patch_size ** 2 * out_channels)
return img
def forward(self, x, timestep, context, y, guidance, **kwargs):
bs, c, h, w = x.shape
patch_size = 2
pad_h = (patch_size - h % 2) % patch_size
pad_w = (patch_size - w % 2) % patch_size
x = torch.nn.functional.pad(x, (0, pad_w, 0, pad_h), mode='circular')
img = rearrange(x, "b c (h ph) (w pw) -> b (h w) (c ph pw)", ph=patch_size, pw=patch_size)
h_len = ((h + (patch_size // 2)) // patch_size)
w_len = ((w + (patch_size // 2)) // patch_size)
img_ids = torch.zeros((h_len, w_len, 3), device=x.device, dtype=x.dtype)
img_ids[..., 1] = img_ids[..., 1] + torch.linspace(0, h_len - 1, steps=h_len, device=x.device, dtype=x.dtype)[:, None]
img_ids[..., 2] = img_ids[..., 2] + torch.linspace(0, w_len - 1, steps=w_len, device=x.device, dtype=x.dtype)[None, :]
img_ids = repeat(img_ids, "h w c -> b (h w) c", b=bs)
txt_ids = torch.zeros((bs, context.shape[1], 3), device=x.device, dtype=x.dtype)
out = self.forward_orig(img, img_ids, context, txt_ids, timestep, y, guidance)
return rearrange(out, "b (h w) (c ph pw) -> b c (h ph) (w pw)", h=h_len, w=w_len, ph=2, pw=2)[:,:,:h,:w]

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import torch
import torch.nn as nn
from typing import Tuple, Union, Optional
from comfy.ldm.modules.attention import optimized_attention
def reshape_for_broadcast(freqs_cis: Union[torch.Tensor, Tuple[torch.Tensor]], x: torch.Tensor, head_first=False):
"""
Reshape frequency tensor for broadcasting it with another tensor.
This function reshapes the frequency tensor to have the same shape as the target tensor 'x'
for the purpose of broadcasting the frequency tensor during element-wise operations.
Args:
freqs_cis (Union[torch.Tensor, Tuple[torch.Tensor]]): Frequency tensor to be reshaped.
x (torch.Tensor): Target tensor for broadcasting compatibility.
head_first (bool): head dimension first (except batch dim) or not.
Returns:
torch.Tensor: Reshaped frequency tensor.
Raises:
AssertionError: If the frequency tensor doesn't match the expected shape.
AssertionError: If the target tensor 'x' doesn't have the expected number of dimensions.
"""
ndim = x.ndim
assert 0 <= 1 < ndim
if isinstance(freqs_cis, tuple):
# freqs_cis: (cos, sin) in real space
if head_first:
assert freqs_cis[0].shape == (x.shape[-2], x.shape[-1]), f'freqs_cis shape {freqs_cis[0].shape} does not match x shape {x.shape}'
shape = [d if i == ndim - 2 or i == ndim - 1 else 1 for i, d in enumerate(x.shape)]
else:
assert freqs_cis[0].shape == (x.shape[1], x.shape[-1]), f'freqs_cis shape {freqs_cis[0].shape} does not match x shape {x.shape}'
shape = [d if i == 1 or i == ndim - 1 else 1 for i, d in enumerate(x.shape)]
return freqs_cis[0].view(*shape), freqs_cis[1].view(*shape)
else:
# freqs_cis: values in complex space
if head_first:
assert freqs_cis.shape == (x.shape[-2], x.shape[-1]), f'freqs_cis shape {freqs_cis.shape} does not match x shape {x.shape}'
shape = [d if i == ndim - 2 or i == ndim - 1 else 1 for i, d in enumerate(x.shape)]
else:
assert freqs_cis.shape == (x.shape[1], x.shape[-1]), f'freqs_cis shape {freqs_cis.shape} does not match x shape {x.shape}'
shape = [d if i == 1 or i == ndim - 1 else 1 for i, d in enumerate(x.shape)]
return freqs_cis.view(*shape)
def rotate_half(x):
x_real, x_imag = x.float().reshape(*x.shape[:-1], -1, 2).unbind(-1) # [B, S, H, D//2]
return torch.stack([-x_imag, x_real], dim=-1).flatten(3)
def apply_rotary_emb(
xq: torch.Tensor,
xk: Optional[torch.Tensor],
freqs_cis: Union[torch.Tensor, Tuple[torch.Tensor]],
head_first: bool = False,
) -> Tuple[torch.Tensor, torch.Tensor]:
"""
Apply rotary embeddings to input tensors using the given frequency tensor.
This function applies rotary embeddings to the given query 'xq' and key 'xk' tensors using the provided
frequency tensor 'freqs_cis'. The input tensors are reshaped as complex numbers, and the frequency tensor
is reshaped for broadcasting compatibility. The resulting tensors contain rotary embeddings and are
returned as real tensors.
Args:
xq (torch.Tensor): Query tensor to apply rotary embeddings. [B, S, H, D]
xk (torch.Tensor): Key tensor to apply rotary embeddings. [B, S, H, D]
freqs_cis (Union[torch.Tensor, Tuple[torch.Tensor]]): Precomputed frequency tensor for complex exponentials.
head_first (bool): head dimension first (except batch dim) or not.
Returns:
Tuple[torch.Tensor, torch.Tensor]: Tuple of modified query tensor and key tensor with rotary embeddings.
"""
xk_out = None
if isinstance(freqs_cis, tuple):
cos, sin = reshape_for_broadcast(freqs_cis, xq, head_first) # [S, D]
cos, sin = cos.to(xq.device), sin.to(xq.device)
xq_out = (xq.float() * cos + rotate_half(xq.float()) * sin).type_as(xq)
if xk is not None:
xk_out = (xk.float() * cos + rotate_half(xk.float()) * sin).type_as(xk)
else:
xq_ = torch.view_as_complex(xq.float().reshape(*xq.shape[:-1], -1, 2)) # [B, S, H, D//2]
freqs_cis = reshape_for_broadcast(freqs_cis, xq_, head_first).to(xq.device) # [S, D//2] --> [1, S, 1, D//2]
xq_out = torch.view_as_real(xq_ * freqs_cis).flatten(3).type_as(xq)
if xk is not None:
xk_ = torch.view_as_complex(xk.float().reshape(*xk.shape[:-1], -1, 2)) # [B, S, H, D//2]
xk_out = torch.view_as_real(xk_ * freqs_cis).flatten(3).type_as(xk)
return xq_out, xk_out
class CrossAttention(nn.Module):
"""
Use QK Normalization.
"""
def __init__(self,
qdim,
kdim,
num_heads,
qkv_bias=True,
qk_norm=False,
attn_drop=0.0,
proj_drop=0.0,
attn_precision=None,
device=None,
dtype=None,
operations=None,
):
factory_kwargs = {'device': device, 'dtype': dtype}
super().__init__()
self.attn_precision = attn_precision
self.qdim = qdim
self.kdim = kdim
self.num_heads = num_heads
assert self.qdim % num_heads == 0, "self.qdim must be divisible by num_heads"
self.head_dim = self.qdim // num_heads
assert self.head_dim % 8 == 0 and self.head_dim <= 128, "Only support head_dim <= 128 and divisible by 8"
self.scale = self.head_dim ** -0.5
self.q_proj = operations.Linear(qdim, qdim, bias=qkv_bias, **factory_kwargs)
self.kv_proj = operations.Linear(kdim, 2 * qdim, bias=qkv_bias, **factory_kwargs)
# TODO: eps should be 1 / 65530 if using fp16
self.q_norm = operations.LayerNorm(self.head_dim, elementwise_affine=True, eps=1e-6, dtype=dtype, device=device) if qk_norm else nn.Identity()
self.k_norm = operations.LayerNorm(self.head_dim, elementwise_affine=True, eps=1e-6, dtype=dtype, device=device) if qk_norm else nn.Identity()
self.attn_drop = nn.Dropout(attn_drop)
self.out_proj = operations.Linear(qdim, qdim, bias=qkv_bias, **factory_kwargs)
self.proj_drop = nn.Dropout(proj_drop)
def forward(self, x, y, freqs_cis_img=None):
"""
Parameters
----------
x: torch.Tensor
(batch, seqlen1, hidden_dim) (where hidden_dim = num heads * head dim)
y: torch.Tensor
(batch, seqlen2, hidden_dim2)
freqs_cis_img: torch.Tensor
(batch, hidden_dim // 2), RoPE for image
"""
b, s1, c = x.shape # [b, s1, D]
_, s2, c = y.shape # [b, s2, 1024]
q = self.q_proj(x).view(b, s1, self.num_heads, self.head_dim) # [b, s1, h, d]
kv = self.kv_proj(y).view(b, s2, 2, self.num_heads, self.head_dim) # [b, s2, 2, h, d]
k, v = kv.unbind(dim=2) # [b, s, h, d]
q = self.q_norm(q)
k = self.k_norm(k)
# Apply RoPE if needed
if freqs_cis_img is not None:
qq, _ = apply_rotary_emb(q, None, freqs_cis_img)
assert qq.shape == q.shape, f'qq: {qq.shape}, q: {q.shape}'
q = qq
q = q.transpose(-2, -3).contiguous() # q -> B, L1, H, C - B, H, L1, C
k = k.transpose(-2, -3).contiguous() # k -> B, L2, H, C - B, H, C, L2
v = v.transpose(-2, -3).contiguous()
context = optimized_attention(q, k, v, self.num_heads, skip_reshape=True, attn_precision=self.attn_precision)
out = self.out_proj(context) # context.reshape - B, L1, -1
out = self.proj_drop(out)
out_tuple = (out,)
return out_tuple
class Attention(nn.Module):
"""
We rename some layer names to align with flash attention
"""
def __init__(self, dim, num_heads, qkv_bias=True, qk_norm=False, attn_drop=0., proj_drop=0., attn_precision=None, dtype=None, device=None, operations=None):
super().__init__()
self.attn_precision = attn_precision
self.dim = dim
self.num_heads = num_heads
assert self.dim % num_heads == 0, 'dim should be divisible by num_heads'
self.head_dim = self.dim // num_heads
# This assertion is aligned with flash attention
assert self.head_dim % 8 == 0 and self.head_dim <= 128, "Only support head_dim <= 128 and divisible by 8"
self.scale = self.head_dim ** -0.5
# qkv --> Wqkv
self.Wqkv = operations.Linear(dim, dim * 3, bias=qkv_bias, dtype=dtype, device=device)
# TODO: eps should be 1 / 65530 if using fp16
self.q_norm = operations.LayerNorm(self.head_dim, elementwise_affine=True, eps=1e-6, dtype=dtype, device=device) if qk_norm else nn.Identity()
self.k_norm = operations.LayerNorm(self.head_dim, elementwise_affine=True, eps=1e-6, dtype=dtype, device=device) if qk_norm else nn.Identity()
self.attn_drop = nn.Dropout(attn_drop)
self.out_proj = operations.Linear(dim, dim, dtype=dtype, device=device)
self.proj_drop = nn.Dropout(proj_drop)
def forward(self, x, freqs_cis_img=None):
B, N, C = x.shape
qkv = self.Wqkv(x).reshape(B, N, 3, self.num_heads, self.head_dim).permute(2, 0, 3, 1, 4) # [3, b, h, s, d]
q, k, v = qkv.unbind(0) # [b, h, s, d]
q = self.q_norm(q) # [b, h, s, d]
k = self.k_norm(k) # [b, h, s, d]
# Apply RoPE if needed
if freqs_cis_img is not None:
qq, kk = apply_rotary_emb(q, k, freqs_cis_img, head_first=True)
assert qq.shape == q.shape and kk.shape == k.shape, \
f'qq: {qq.shape}, q: {q.shape}, kk: {kk.shape}, k: {k.shape}'
q, k = qq, kk
x = optimized_attention(q, k, v, self.num_heads, skip_reshape=True, attn_precision=self.attn_precision)
x = self.out_proj(x)
x = self.proj_drop(x)
out_tuple = (x,)
return out_tuple

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from typing import Any
import torch
import torch.nn as nn
import torch.nn.functional as F
import comfy.ops
from comfy.ldm.modules.diffusionmodules.mmdit import Mlp, TimestepEmbedder, PatchEmbed, RMSNorm
from comfy.ldm.modules.diffusionmodules.util import timestep_embedding
from torch.utils import checkpoint
from .attn_layers import Attention, CrossAttention
from .poolers import AttentionPool
from .posemb_layers import get_2d_rotary_pos_embed, get_fill_resize_and_crop
def calc_rope(x, patch_size, head_size):
th = (x.shape[2] + (patch_size // 2)) // patch_size
tw = (x.shape[3] + (patch_size // 2)) // patch_size
base_size = 512 // 8 // patch_size
start, stop = get_fill_resize_and_crop((th, tw), base_size)
sub_args = [start, stop, (th, tw)]
# head_size = HUNYUAN_DIT_CONFIG['DiT-g/2']['hidden_size'] // HUNYUAN_DIT_CONFIG['DiT-g/2']['num_heads']
rope = get_2d_rotary_pos_embed(head_size, *sub_args)
return rope
def modulate(x, shift, scale):
return x * (1 + scale.unsqueeze(1)) + shift.unsqueeze(1)
class HunYuanDiTBlock(nn.Module):
"""
A HunYuanDiT block with `add` conditioning.
"""
def __init__(self,
hidden_size,
c_emb_size,
num_heads,
mlp_ratio=4.0,
text_states_dim=1024,
qk_norm=False,
norm_type="layer",
skip=False,
attn_precision=None,
dtype=None,
device=None,
operations=None,
):
super().__init__()
use_ele_affine = True
if norm_type == "layer":
norm_layer = operations.LayerNorm
elif norm_type == "rms":
norm_layer = RMSNorm
else:
raise ValueError(f"Unknown norm_type: {norm_type}")
# ========================= Self-Attention =========================
self.norm1 = norm_layer(hidden_size, elementwise_affine=use_ele_affine, eps=1e-6, dtype=dtype, device=device)
self.attn1 = Attention(hidden_size, num_heads=num_heads, qkv_bias=True, qk_norm=qk_norm, attn_precision=attn_precision, dtype=dtype, device=device, operations=operations)
# ========================= FFN =========================
self.norm2 = norm_layer(hidden_size, elementwise_affine=use_ele_affine, eps=1e-6, dtype=dtype, device=device)
mlp_hidden_dim = int(hidden_size * mlp_ratio)
approx_gelu = lambda: nn.GELU(approximate="tanh")
self.mlp = Mlp(in_features=hidden_size, hidden_features=mlp_hidden_dim, act_layer=approx_gelu, drop=0, dtype=dtype, device=device, operations=operations)
# ========================= Add =========================
# Simply use add like SDXL.
self.default_modulation = nn.Sequential(
nn.SiLU(),
operations.Linear(c_emb_size, hidden_size, bias=True, dtype=dtype, device=device)
)
# ========================= Cross-Attention =========================
self.attn2 = CrossAttention(hidden_size, text_states_dim, num_heads=num_heads, qkv_bias=True,
qk_norm=qk_norm, attn_precision=attn_precision, dtype=dtype, device=device, operations=operations)
self.norm3 = norm_layer(hidden_size, elementwise_affine=True, eps=1e-6, dtype=dtype, device=device)
# ========================= Skip Connection =========================
if skip:
self.skip_norm = norm_layer(2 * hidden_size, elementwise_affine=True, eps=1e-6, dtype=dtype, device=device)
self.skip_linear = operations.Linear(2 * hidden_size, hidden_size, dtype=dtype, device=device)
else:
self.skip_linear = None
self.gradient_checkpointing = False
def _forward(self, x, c=None, text_states=None, freq_cis_img=None, skip=None):
# Long Skip Connection
if self.skip_linear is not None:
cat = torch.cat([x, skip], dim=-1)
cat = self.skip_norm(cat)
x = self.skip_linear(cat)
# Self-Attention
shift_msa = self.default_modulation(c).unsqueeze(dim=1)
attn_inputs = (
self.norm1(x) + shift_msa, freq_cis_img,
)
x = x + self.attn1(*attn_inputs)[0]
# Cross-Attention
cross_inputs = (
self.norm3(x), text_states, freq_cis_img
)
x = x + self.attn2(*cross_inputs)[0]
# FFN Layer
mlp_inputs = self.norm2(x)
x = x + self.mlp(mlp_inputs)
return x
def forward(self, x, c=None, text_states=None, freq_cis_img=None, skip=None):
if self.gradient_checkpointing and self.training:
return checkpoint.checkpoint(self._forward, x, c, text_states, freq_cis_img, skip)
return self._forward(x, c, text_states, freq_cis_img, skip)
class FinalLayer(nn.Module):
"""
The final layer of HunYuanDiT.
"""
def __init__(self, final_hidden_size, c_emb_size, patch_size, out_channels, dtype=None, device=None, operations=None):
super().__init__()
self.norm_final = operations.LayerNorm(final_hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.linear = operations.Linear(final_hidden_size, patch_size * patch_size * out_channels, bias=True, dtype=dtype, device=device)
self.adaLN_modulation = nn.Sequential(
nn.SiLU(),
operations.Linear(c_emb_size, 2 * final_hidden_size, bias=True, dtype=dtype, device=device)
)
def forward(self, x, c):
shift, scale = self.adaLN_modulation(c).chunk(2, dim=1)
x = modulate(self.norm_final(x), shift, scale)
x = self.linear(x)
return x
class HunYuanDiT(nn.Module):
"""
HunYuanDiT: Diffusion model with a Transformer backbone.
Inherit ModelMixin and ConfigMixin to be compatible with the sampler StableDiffusionPipeline of diffusers.
Inherit PeftAdapterMixin to be compatible with the PEFT training pipeline.
Parameters
----------
args: argparse.Namespace
The arguments parsed by argparse.
input_size: tuple
The size of the input image.
patch_size: int
The size of the patch.
in_channels: int
The number of input channels.
hidden_size: int
The hidden size of the transformer backbone.
depth: int
The number of transformer blocks.
num_heads: int
The number of attention heads.
mlp_ratio: float
The ratio of the hidden size of the MLP in the transformer block.
log_fn: callable
The logging function.
"""
#@register_to_config
def __init__(self,
input_size: tuple = 32,
patch_size: int = 2,
in_channels: int = 4,
hidden_size: int = 1152,
depth: int = 28,
num_heads: int = 16,
mlp_ratio: float = 4.0,
text_states_dim = 1024,
text_states_dim_t5 = 2048,
text_len = 77,
text_len_t5 = 256,
qk_norm = True,# See http://arxiv.org/abs/2302.05442 for details.
size_cond = False,
use_style_cond = False,
learn_sigma = True,
norm = "layer",
log_fn: callable = print,
attn_precision=None,
dtype=None,
device=None,
operations=None,
**kwargs,
):
super().__init__()
self.log_fn = log_fn
self.depth = depth
self.learn_sigma = learn_sigma
self.in_channels = in_channels
self.out_channels = in_channels * 2 if learn_sigma else in_channels
self.patch_size = patch_size
self.num_heads = num_heads
self.hidden_size = hidden_size
self.text_states_dim = text_states_dim
self.text_states_dim_t5 = text_states_dim_t5
self.text_len = text_len
self.text_len_t5 = text_len_t5
self.size_cond = size_cond
self.use_style_cond = use_style_cond
self.norm = norm
self.dtype = dtype
#import pdb
#pdb.set_trace()
self.mlp_t5 = nn.Sequential(
operations.Linear(self.text_states_dim_t5, self.text_states_dim_t5 * 4, bias=True, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(self.text_states_dim_t5 * 4, self.text_states_dim, bias=True, dtype=dtype, device=device),
)
# learnable replace
self.text_embedding_padding = nn.Parameter(
torch.empty(self.text_len + self.text_len_t5, self.text_states_dim, dtype=dtype, device=device))
# Attention pooling
pooler_out_dim = 1024
self.pooler = AttentionPool(self.text_len_t5, self.text_states_dim_t5, num_heads=8, output_dim=pooler_out_dim, dtype=dtype, device=device, operations=operations)
# Dimension of the extra input vectors
self.extra_in_dim = pooler_out_dim
if self.size_cond:
# Image size and crop size conditions
self.extra_in_dim += 6 * 256
if self.use_style_cond:
# Here we use a default learned embedder layer for future extension.
self.style_embedder = operations.Embedding(1, hidden_size, dtype=dtype, device=device)
self.extra_in_dim += hidden_size
# Text embedding for `add`
self.x_embedder = PatchEmbed(input_size, patch_size, in_channels, hidden_size, dtype=dtype, device=device, operations=operations)
self.t_embedder = TimestepEmbedder(hidden_size, dtype=dtype, device=device, operations=operations)
self.extra_embedder = nn.Sequential(
operations.Linear(self.extra_in_dim, hidden_size * 4, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(hidden_size * 4, hidden_size, bias=True, dtype=dtype, device=device),
)
# Image embedding
num_patches = self.x_embedder.num_patches
# HUnYuanDiT Blocks
self.blocks = nn.ModuleList([
HunYuanDiTBlock(hidden_size=hidden_size,
c_emb_size=hidden_size,
num_heads=num_heads,
mlp_ratio=mlp_ratio,
text_states_dim=self.text_states_dim,
qk_norm=qk_norm,
norm_type=self.norm,
skip=layer > depth // 2,
attn_precision=attn_precision,
dtype=dtype,
device=device,
operations=operations,
)
for layer in range(depth)
])
self.final_layer = FinalLayer(hidden_size, hidden_size, patch_size, self.out_channels, dtype=dtype, device=device, operations=operations)
self.unpatchify_channels = self.out_channels
def forward(self,
x,
t,
context,#encoder_hidden_states=None,
text_embedding_mask=None,
encoder_hidden_states_t5=None,
text_embedding_mask_t5=None,
image_meta_size=None,
style=None,
return_dict=False,
control=None,
transformer_options=None,
):
"""
Forward pass of the encoder.
Parameters
----------
x: torch.Tensor
(B, D, H, W)
t: torch.Tensor
(B)
encoder_hidden_states: torch.Tensor
CLIP text embedding, (B, L_clip, D)
text_embedding_mask: torch.Tensor
CLIP text embedding mask, (B, L_clip)
encoder_hidden_states_t5: torch.Tensor
T5 text embedding, (B, L_t5, D)
text_embedding_mask_t5: torch.Tensor
T5 text embedding mask, (B, L_t5)
image_meta_size: torch.Tensor
(B, 6)
style: torch.Tensor
(B)
cos_cis_img: torch.Tensor
sin_cis_img: torch.Tensor
return_dict: bool
Whether to return a dictionary.
"""
#import pdb
#pdb.set_trace()
encoder_hidden_states = context
text_states = encoder_hidden_states # 2,77,1024
text_states_t5 = encoder_hidden_states_t5 # 2,256,2048
text_states_mask = text_embedding_mask.bool() # 2,77
text_states_t5_mask = text_embedding_mask_t5.bool() # 2,256
b_t5, l_t5, c_t5 = text_states_t5.shape
text_states_t5 = self.mlp_t5(text_states_t5.view(-1, c_t5)).view(b_t5, l_t5, -1)
padding = comfy.ops.cast_to_input(self.text_embedding_padding, text_states)
text_states[:,-self.text_len:] = torch.where(text_states_mask[:,-self.text_len:].unsqueeze(2), text_states[:,-self.text_len:], padding[:self.text_len])
text_states_t5[:,-self.text_len_t5:] = torch.where(text_states_t5_mask[:,-self.text_len_t5:].unsqueeze(2), text_states_t5[:,-self.text_len_t5:], padding[self.text_len:])
text_states = torch.cat([text_states, text_states_t5], dim=1) # 2,205，1024
# clip_t5_mask = torch.cat([text_states_mask, text_states_t5_mask], dim=-1)
_, _, oh, ow = x.shape
th, tw = (oh + (self.patch_size // 2)) // self.patch_size, (ow + (self.patch_size // 2)) // self.patch_size
# Get image RoPE embedding according to `reso`lution.
freqs_cis_img = calc_rope(x, self.patch_size, self.hidden_size // self.num_heads) #(cos_cis_img, sin_cis_img)
# ========================= Build time and image embedding =========================
t = self.t_embedder(t, dtype=x.dtype)
x = self.x_embedder(x)
# ========================= Concatenate all extra vectors =========================
# Build text tokens with pooling
extra_vec = self.pooler(encoder_hidden_states_t5)
# Build image meta size tokens if applicable
if self.size_cond:
image_meta_size = timestep_embedding(image_meta_size.view(-1), 256).to(x.dtype) # [B * 6, 256]
image_meta_size = image_meta_size.view(-1, 6 * 256)
extra_vec = torch.cat([extra_vec, image_meta_size], dim=1) # [B, D + 6 * 256]
# Build style tokens
if self.use_style_cond:
if style is None:
style = torch.zeros((extra_vec.shape[0],), device=x.device, dtype=torch.int)
style_embedding = self.style_embedder(style, out_dtype=x.dtype)
extra_vec = torch.cat([extra_vec, style_embedding], dim=1)
# Concatenate all extra vectors
c = t + self.extra_embedder(extra_vec) # [B, D]
controls = None
# ========================= Forward pass through HunYuanDiT blocks =========================
skips = []
for layer, block in enumerate(self.blocks):
if layer > self.depth // 2:
if controls is not None:
skip = skips.pop() + controls.pop()
else:
skip = skips.pop()
x = block(x, c, text_states, freqs_cis_img, skip) # (N, L, D)
else:
x = block(x, c, text_states, freqs_cis_img) # (N, L, D)
if layer < (self.depth // 2 - 1):
skips.append(x)
if controls is not None and len(controls) != 0:
raise ValueError("The number of controls is not equal to the number of skip connections.")
# ========================= Final layer =========================
x = self.final_layer(x, c) # (N, L, patch_size ** 2 * out_channels)
x = self.unpatchify(x, th, tw) # (N, out_channels, H, W)
if return_dict:
return {'x': x}
if self.learn_sigma:
return x[:,:self.out_channels // 2,:oh,:ow]
return x[:,:,:oh,:ow]
def unpatchify(self, x, h, w):
"""
x: (N, T, patch_size**2 * C)
imgs: (N, H, W, C)
"""
c = self.unpatchify_channels
p = self.x_embedder.patch_size[0]
# h = w = int(x.shape[1] ** 0.5)
assert h * w == x.shape[1]
x = x.reshape(shape=(x.shape[0], h, w, p, p, c))
x = torch.einsum('nhwpqc->nchpwq', x)
imgs = x.reshape(shape=(x.shape[0], c, h * p, w * p))
return imgs

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import torch
import torch.nn as nn
import torch.nn.functional as F
from comfy.ldm.modules.attention import optimized_attention
import comfy.ops
class AttentionPool(nn.Module):
def __init__(self, spacial_dim: int, embed_dim: int, num_heads: int, output_dim: int = None, dtype=None, device=None, operations=None):
super().__init__()
self.positional_embedding = nn.Parameter(torch.empty(spacial_dim + 1, embed_dim, dtype=dtype, device=device))
self.k_proj = operations.Linear(embed_dim, embed_dim, dtype=dtype, device=device)
self.q_proj = operations.Linear(embed_dim, embed_dim, dtype=dtype, device=device)
self.v_proj = operations.Linear(embed_dim, embed_dim, dtype=dtype, device=device)
self.c_proj = operations.Linear(embed_dim, output_dim or embed_dim, dtype=dtype, device=device)
self.num_heads = num_heads
self.embed_dim = embed_dim
def forward(self, x):
x = x[:,:self.positional_embedding.shape[0] - 1]
x = x.permute(1, 0, 2) # NLC -> LNC
x = torch.cat([x.mean(dim=0, keepdim=True), x], dim=0) # (L+1)NC
x = x + comfy.ops.cast_to_input(self.positional_embedding[:, None, :], x) # (L+1)NC
q = self.q_proj(x[:1])
k = self.k_proj(x)
v = self.v_proj(x)
batch_size = q.shape[1]
head_dim = self.embed_dim // self.num_heads
q = q.view(1, batch_size * self.num_heads, head_dim).transpose(0, 1).view(batch_size, self.num_heads, -1, head_dim)
k = k.view(k.shape[0], batch_size * self.num_heads, head_dim).transpose(0, 1).view(batch_size, self.num_heads, -1, head_dim)
v = v.view(v.shape[0], batch_size * self.num_heads, head_dim).transpose(0, 1).view(batch_size, self.num_heads, -1, head_dim)
attn_output = optimized_attention(q, k, v, self.num_heads, skip_reshape=True).transpose(0, 1)
attn_output = self.c_proj(attn_output)
return attn_output.squeeze(0)

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comfy/ldm/hydit/posemb_layers.py Normal file
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import torch
import numpy as np
from typing import Union
def _to_tuple(x):
if isinstance(x, int):
return x, x
else:
return x
def get_fill_resize_and_crop(src, tgt):
th, tw = _to_tuple(tgt)
h, w = _to_tuple(src)
tr = th / tw # base resolution
r = h / w # target resolution
# resize
if r > tr:
resize_height = th
resize_width = int(round(th / h * w))
else:
resize_width = tw
resize_height = int(round(tw / w * h)) # resize the target resolution down based on the base resolution
crop_top = int(round((th - resize_height) / 2.0))
crop_left = int(round((tw - resize_width) / 2.0))
return (crop_top, crop_left), (crop_top + resize_height, crop_left + resize_width)
def get_meshgrid(start, *args):
if len(args) == 0:
# start is grid_size
num = _to_tuple(start)
start = (0, 0)
stop = num
elif len(args) == 1:
# start is start, args[0] is stop, step is 1
start = _to_tuple(start)
stop = _to_tuple(args[0])
num = (stop[0] - start[0], stop[1] - start[1])
elif len(args) == 2:
# start is start, args[0] is stop, args[1] is num
start = _to_tuple(start)
stop = _to_tuple(args[0])
num = _to_tuple(args[1])
else:
raise ValueError(f"len(args) should be 0, 1 or 2, but got {len(args)}")
grid_h = np.linspace(start[0], stop[0], num[0], endpoint=False, dtype=np.float32)
grid_w = np.linspace(start[1], stop[1], num[1], endpoint=False, dtype=np.float32)
grid = np.meshgrid(grid_w, grid_h) # here w goes first
grid = np.stack(grid, axis=0) # [2, W, H]
return grid
#################################################################################
# Sine/Cosine Positional Embedding Functions #
#################################################################################
# https://github.com/facebookresearch/mae/blob/main/util/pos_embed.py
def get_2d_sincos_pos_embed(embed_dim, start, *args, cls_token=False, extra_tokens=0):
"""
grid_size: int of the grid height and width
return:
pos_embed: [grid_size*grid_size, embed_dim] or [1+grid_size*grid_size, embed_dim] (w/ or w/o cls_token)
"""
grid = get_meshgrid(start, *args) # [2, H, w]
# grid_h = np.arange(grid_size, dtype=np.float32)
# grid_w = np.arange(grid_size, dtype=np.float32)
# grid = np.meshgrid(grid_w, grid_h) # here w goes first
# grid = np.stack(grid, axis=0) # [2, W, H]
grid = grid.reshape([2, 1, *grid.shape[1:]])
pos_embed = get_2d_sincos_pos_embed_from_grid(embed_dim, grid)
if cls_token and extra_tokens > 0:
pos_embed = np.concatenate([np.zeros([extra_tokens, embed_dim]), pos_embed], axis=0)
return pos_embed
def get_2d_sincos_pos_embed_from_grid(embed_dim, grid):
assert embed_dim % 2 == 0
# use half of dimensions to encode grid_h
emb_h = get_1d_sincos_pos_embed_from_grid(embed_dim // 2, grid[0]) # (H*W, D/2)
emb_w = get_1d_sincos_pos_embed_from_grid(embed_dim // 2, grid[1]) # (H*W, D/2)
emb = np.concatenate([emb_h, emb_w], axis=1) # (H*W, D)
return emb
def get_1d_sincos_pos_embed_from_grid(embed_dim, pos):
"""
embed_dim: output dimension for each position
pos: a list of positions to be encoded: size (W,H)
out: (M, D)
"""
assert embed_dim % 2 == 0
omega = np.arange(embed_dim // 2, dtype=np.float64)
omega /= embed_dim / 2.
omega = 1. / 10000**omega # (D/2,)
pos = pos.reshape(-1) # (M,)
out = np.einsum('m,d->md', pos, omega) # (M, D/2), outer product
emb_sin = np.sin(out) # (M, D/2)
emb_cos = np.cos(out) # (M, D/2)
emb = np.concatenate([emb_sin, emb_cos], axis=1) # (M, D)
return emb
#################################################################################
# Rotary Positional Embedding Functions #
#################################################################################
# https://github.com/facebookresearch/llama/blob/main/llama/model.py#L443
def get_2d_rotary_pos_embed(embed_dim, start, *args, use_real=True):
"""
This is a 2d version of precompute_freqs_cis, which is a RoPE for image tokens with 2d structure.
Parameters
----------
embed_dim: int
embedding dimension size
start: int or tuple of int
If len(args) == 0, start is num; If len(args) == 1, start is start, args[0] is stop, step is 1;
If len(args) == 2, start is start, args[0] is stop, args[1] is num.
use_real: bool
If True, return real part and imaginary part separately. Otherwise, return complex numbers.
Returns
-------
pos_embed: torch.Tensor
[HW, D/2]
"""
grid = get_meshgrid(start, *args) # [2, H, w]
grid = grid.reshape([2, 1, *grid.shape[1:]]) # Returns a sampling matrix with the same resolution as the target resolution
pos_embed = get_2d_rotary_pos_embed_from_grid(embed_dim, grid, use_real=use_real)
return pos_embed
def get_2d_rotary_pos_embed_from_grid(embed_dim, grid, use_real=False):
assert embed_dim % 4 == 0
# use half of dimensions to encode grid_h
emb_h = get_1d_rotary_pos_embed(embed_dim // 2, grid[0].reshape(-1), use_real=use_real) # (H*W, D/4)
emb_w = get_1d_rotary_pos_embed(embed_dim // 2, grid[1].reshape(-1), use_real=use_real) # (H*W, D/4)
if use_real:
cos = torch.cat([emb_h[0], emb_w[0]], dim=1) # (H*W, D/2)
sin = torch.cat([emb_h[1], emb_w[1]], dim=1) # (H*W, D/2)
return cos, sin
else:
emb = torch.cat([emb_h, emb_w], dim=1) # (H*W, D/2)
return emb
def get_1d_rotary_pos_embed(dim: int, pos: Union[np.ndarray, int], theta: float = 10000.0, use_real=False):
"""
Precompute the frequency tensor for complex exponentials (cis) with given dimensions.
This function calculates a frequency tensor with complex exponentials using the given dimension 'dim'
and the end index 'end'. The 'theta' parameter scales the frequencies.
The returned tensor contains complex values in complex64 data type.
Args:
dim (int): Dimension of the frequency tensor.
pos (np.ndarray, int): Position indices for the frequency tensor. [S] or scalar
theta (float, optional): Scaling factor for frequency computation. Defaults to 10000.0.
use_real (bool, optional): If True, return real part and imaginary part separately.
Otherwise, return complex numbers.
Returns:
torch.Tensor: Precomputed frequency tensor with complex exponentials. [S, D/2]
"""
if isinstance(pos, int):
pos = np.arange(pos)
freqs = 1.0 / (theta ** (torch.arange(0, dim, 2)[: (dim // 2)].float() / dim)) # [D/2]
t = torch.from_numpy(pos).to(freqs.device) # type: ignore # [S]
freqs = torch.outer(t, freqs).float() # type: ignore # [S, D/2]
if use_real:
freqs_cos = freqs.cos().repeat_interleave(2, dim=1) # [S, D]
freqs_sin = freqs.sin().repeat_interleave(2, dim=1) # [S, D]
return freqs_cos, freqs_sin
else:
freqs_cis = torch.polar(torch.ones_like(freqs), freqs) # complex64 # [S, D/2]
return freqs_cis
def calc_sizes(rope_img, patch_size, th, tw):
if rope_img == 'extend':
# Expansion mode
sub_args = [(th, tw)]
elif rope_img.startswith('base'):
# Based on the specified dimensions, other dimensions are obtained through interpolation.
base_size = int(rope_img[4:]) // 8 // patch_size
start, stop = get_fill_resize_and_crop((th, tw), base_size)
sub_args = [start, stop, (th, tw)]
else:
raise ValueError(f"Unknown rope_img: {rope_img}")
return sub_args
def init_image_posemb(rope_img,
resolutions,
patch_size,
hidden_size,
num_heads,
log_fn,
rope_real=True,
):
freqs_cis_img = {}
for reso in resolutions:
th, tw = reso.height // 8 // patch_size, reso.width // 8 // patch_size
sub_args = calc_sizes(rope_img, patch_size, th, tw)
freqs_cis_img[str(reso)] = get_2d_rotary_pos_embed(hidden_size // num_heads, *sub_args, use_real=rope_real)
log_fn(f" Using image RoPE ({rope_img}) ({'real' if rope_real else 'complex'}): {sub_args} | ({reso}) "
f"{freqs_cis_img[str(reso)][0].shape if rope_real else freqs_cis_img[str(reso)].shape}")
return freqs_cis_img

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import torch
from contextlib import contextmanager
from typing import Any, Dict, List, Optional, Tuple, Union
from comfy.ldm.modules.distributions.distributions import DiagonalGaussianDistribution
from comfy.ldm.util import instantiate_from_config
from comfy.ldm.modules.ema import LitEma
import comfy.ops
class DiagonalGaussianRegularizer(torch.nn.Module):
def __init__(self, sample: bool = True):
super().__init__()
self.sample = sample
def get_trainable_parameters(self) -> Any:
yield from ()
def forward(self, z: torch.Tensor) -> Tuple[torch.Tensor, dict]:
log = dict()
posterior = DiagonalGaussianDistribution(z)
if self.sample:
z = posterior.sample()
else:
z = posterior.mode()
kl_loss = posterior.kl()
kl_loss = torch.sum(kl_loss) / kl_loss.shape[0]
log["kl_loss"] = kl_loss
return z, log
class AbstractAutoencoder(torch.nn.Module):
"""
This is the base class for all autoencoders, including image autoencoders, image autoencoders with discriminators,
unCLIP models, etc. Hence, it is fairly general, and specific features
(e.g. discriminator training, encoding, decoding) must be implemented in subclasses.
"""
def __init__(
self,
ema_decay: Union[None, float] = None,
monitor: Union[None, str] = None,
input_key: str = "jpg",
**kwargs,
):
super().__init__()
self.input_key = input_key
self.use_ema = ema_decay is not None
if monitor is not None:
self.monitor = monitor
if self.use_ema:
self.model_ema = LitEma(self, decay=ema_decay)
logpy.info(f"Keeping EMAs of {len(list(self.model_ema.buffers()))}.")
def get_input(self, batch) -> Any:
raise NotImplementedError()
def on_train_batch_end(self, *args, **kwargs):
# for EMA computation
if self.use_ema:
self.model_ema(self)
@contextmanager
def ema_scope(self, context=None):
if self.use_ema:
self.model_ema.store(self.parameters())
self.model_ema.copy_to(self)
if context is not None:
logpy.info(f"{context}: Switched to EMA weights")
try:
yield None
finally:
if self.use_ema:
self.model_ema.restore(self.parameters())
if context is not None:
logpy.info(f"{context}: Restored training weights")
def encode(self, *args, **kwargs) -> torch.Tensor:
raise NotImplementedError("encode()-method of abstract base class called")
def decode(self, *args, **kwargs) -> torch.Tensor:
raise NotImplementedError("decode()-method of abstract base class called")
def instantiate_optimizer_from_config(self, params, lr, cfg):
logpy.info(f"loading >>> {cfg['target']} <<< optimizer from config")
return get_obj_from_str(cfg["target"])(
params, lr=lr, **cfg.get("params", dict())
)
def configure_optimizers(self) -> Any:
raise NotImplementedError()
class AutoencodingEngine(AbstractAutoencoder):
"""
Base class for all image autoencoders that we train, like VQGAN or AutoencoderKL
(we also restore them explicitly as special cases for legacy reasons).
Regularizations such as KL or VQ are moved to the regularizer class.
"""
def __init__(
self,
*args,
encoder_config: Dict,
decoder_config: Dict,
regularizer_config: Dict,
**kwargs,
):
super().__init__(*args, **kwargs)
self.encoder: torch.nn.Module = instantiate_from_config(encoder_config)
self.decoder: torch.nn.Module = instantiate_from_config(decoder_config)
self.regularization: AbstractRegularizer = instantiate_from_config(
regularizer_config
)
def get_last_layer(self):
return self.decoder.get_last_layer()
def encode(
self,
x: torch.Tensor,
return_reg_log: bool = False,
unregularized: bool = False,
) -> Union[torch.Tensor, Tuple[torch.Tensor, dict]]:
z = self.encoder(x)
if unregularized:
return z, dict()
z, reg_log = self.regularization(z)
if return_reg_log:
return z, reg_log
return z
def decode(self, z: torch.Tensor, **kwargs) -> torch.Tensor:
x = self.decoder(z, **kwargs)
return x
def forward(
self, x: torch.Tensor, **additional_decode_kwargs
) -> Tuple[torch.Tensor, torch.Tensor, dict]:
z, reg_log = self.encode(x, return_reg_log=True)
dec = self.decode(z, **additional_decode_kwargs)
return z, dec, reg_log
class AutoencodingEngineLegacy(AutoencodingEngine):
def __init__(self, embed_dim: int, **kwargs):
self.max_batch_size = kwargs.pop("max_batch_size", None)
ddconfig = kwargs.pop("ddconfig")
super().__init__(
encoder_config={
"target": "comfy.ldm.modules.diffusionmodules.model.Encoder",
"params": ddconfig,
},
decoder_config={
"target": "comfy.ldm.modules.diffusionmodules.model.Decoder",
"params": ddconfig,
},
**kwargs,
)
self.quant_conv = comfy.ops.disable_weight_init.Conv2d(
(1 + ddconfig["double_z"]) * ddconfig["z_channels"],
(1 + ddconfig["double_z"]) * embed_dim,
1,
)
self.post_quant_conv = comfy.ops.disable_weight_init.Conv2d(embed_dim, ddconfig["z_channels"], 1)
self.embed_dim = embed_dim
def get_autoencoder_params(self) -> list:
params = super().get_autoencoder_params()
return params
def encode(
self, x: torch.Tensor, return_reg_log: bool = False
) -> Union[torch.Tensor, Tuple[torch.Tensor, dict]]:
if self.max_batch_size is None:
z = self.encoder(x)
z = self.quant_conv(z)
else:
N = x.shape[0]
bs = self.max_batch_size
n_batches = int(math.ceil(N / bs))
z = list()
for i_batch in range(n_batches):
z_batch = self.encoder(x[i_batch * bs : (i_batch + 1) * bs])
z_batch = self.quant_conv(z_batch)
z.append(z_batch)
z = torch.cat(z, 0)
z, reg_log = self.regularization(z)
if return_reg_log:
return z, reg_log
return z
def decode(self, z: torch.Tensor, **decoder_kwargs) -> torch.Tensor:
if self.max_batch_size is None:
dec = self.post_quant_conv(z)
dec = self.decoder(dec, **decoder_kwargs)
else:
N = z.shape[0]
bs = self.max_batch_size
n_batches = int(math.ceil(N / bs))
dec = list()
for i_batch in range(n_batches):
dec_batch = self.post_quant_conv(z[i_batch * bs : (i_batch + 1) * bs])
dec_batch = self.decoder(dec_batch, **decoder_kwargs)
dec.append(dec_batch)
dec = torch.cat(dec, 0)
return dec
class AutoencoderKL(AutoencodingEngineLegacy):
def __init__(self, **kwargs):
if "lossconfig" in kwargs:
kwargs["loss_config"] = kwargs.pop("lossconfig")
super().__init__(
regularizer_config={
"target": (
"comfy.ldm.models.autoencoder.DiagonalGaussianRegularizer"
)
},
**kwargs,
)

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import math
import torch
import torch.nn.functional as F
from torch import nn, einsum
from einops import rearrange, repeat
from typing import Optional
import logging
from .diffusionmodules.util import AlphaBlender, timestep_embedding
from .sub_quadratic_attention import efficient_dot_product_attention
from comfy import model_management
if model_management.xformers_enabled():
import xformers
import xformers.ops
from comfy.cli_args import args
import comfy.ops
ops = comfy.ops.disable_weight_init
FORCE_UPCAST_ATTENTION_DTYPE = model_management.force_upcast_attention_dtype()
def get_attn_precision(attn_precision):
if args.dont_upcast_attention:
return None
if FORCE_UPCAST_ATTENTION_DTYPE is not None:
return FORCE_UPCAST_ATTENTION_DTYPE
return attn_precision
def exists(val):
return val is not None
def uniq(arr):
return{el: True for el in arr}.keys()
def default(val, d):
if exists(val):
return val
return d
def max_neg_value(t):
return -torch.finfo(t.dtype).max
def init_(tensor):
dim = tensor.shape[-1]
std = 1 / math.sqrt(dim)
tensor.uniform_(-std, std)
return tensor
# feedforward
class GEGLU(nn.Module):
def __init__(self, dim_in, dim_out, dtype=None, device=None, operations=ops):
super().__init__()
self.proj = operations.Linear(dim_in, dim_out * 2, dtype=dtype, device=device)
def forward(self, x):
x, gate = self.proj(x).chunk(2, dim=-1)
return x * F.gelu(gate)
class FeedForward(nn.Module):
def __init__(self, dim, dim_out=None, mult=4, glu=False, dropout=0., dtype=None, device=None, operations=ops):
super().__init__()
inner_dim = int(dim * mult)
dim_out = default(dim_out, dim)
project_in = nn.Sequential(
operations.Linear(dim, inner_dim, dtype=dtype, device=device),
nn.GELU()
) if not glu else GEGLU(dim, inner_dim, dtype=dtype, device=device, operations=operations)
self.net = nn.Sequential(
project_in,
nn.Dropout(dropout),
operations.Linear(inner_dim, dim_out, dtype=dtype, device=device)
)
def forward(self, x):
return self.net(x)
def Normalize(in_channels, dtype=None, device=None):
return torch.nn.GroupNorm(num_groups=32, num_channels=in_channels, eps=1e-6, affine=True, dtype=dtype, device=device)
def attention_basic(q, k, v, heads, mask=None, attn_precision=None, skip_reshape=False):
attn_precision = get_attn_precision(attn_precision)
if skip_reshape:
b, _, _, dim_head = q.shape
else:
b, _, dim_head = q.shape
dim_head //= heads
scale = dim_head ** -0.5
h = heads
if skip_reshape:
q, k, v = map(
lambda t: t.reshape(b * heads, -1, dim_head),
(q, k, v),
)
else:
q, k, v = map(
lambda t: t.unsqueeze(3)
.reshape(b, -1, heads, dim_head)
.permute(0, 2, 1, 3)
.reshape(b * heads, -1, dim_head)
.contiguous(),
(q, k, v),
)
# force cast to fp32 to avoid overflowing
if attn_precision == torch.float32:
sim = einsum('b i d, b j d -> b i j', q.float(), k.float()) * scale
else:
sim = einsum('b i d, b j d -> b i j', q, k) * scale
del q, k
if exists(mask):
if mask.dtype == torch.bool:
mask = rearrange(mask, 'b ... -> b (...)') #TODO: check if this bool part matches pytorch attention
max_neg_value = -torch.finfo(sim.dtype).max
mask = repeat(mask, 'b j -> (b h) () j', h=h)
sim.masked_fill_(~mask, max_neg_value)
else:
if len(mask.shape) == 2:
bs = 1
else:
bs = mask.shape[0]
mask = mask.reshape(bs, -1, mask.shape[-2], mask.shape[-1]).expand(b, heads, -1, -1).reshape(-1, mask.shape[-2], mask.shape[-1])
sim.add_(mask)
# attention, what we cannot get enough of
sim = sim.softmax(dim=-1)
out = einsum('b i j, b j d -> b i d', sim.to(v.dtype), v)
out = (
out.unsqueeze(0)
.reshape(b, heads, -1, dim_head)
.permute(0, 2, 1, 3)
.reshape(b, -1, heads * dim_head)
)
return out
def attention_sub_quad(query, key, value, heads, mask=None, attn_precision=None, skip_reshape=False):
attn_precision = get_attn_precision(attn_precision)
if skip_reshape:
b, _, _, dim_head = query.shape
else:
b, _, dim_head = query.shape
dim_head //= heads
scale = dim_head ** -0.5
if skip_reshape:
query = query.reshape(b * heads, -1, dim_head)
value = value.reshape(b * heads, -1, dim_head)
key = key.reshape(b * heads, -1, dim_head).movedim(1, 2)
else:
query = query.unsqueeze(3).reshape(b, -1, heads, dim_head).permute(0, 2, 1, 3).reshape(b * heads, -1, dim_head)
value = value.unsqueeze(3).reshape(b, -1, heads, dim_head).permute(0, 2, 1, 3).reshape(b * heads, -1, dim_head)
key = key.unsqueeze(3).reshape(b, -1, heads, dim_head).permute(0, 2, 3, 1).reshape(b * heads, dim_head, -1)
dtype = query.dtype
upcast_attention = attn_precision == torch.float32 and query.dtype != torch.float32
if upcast_attention:
bytes_per_token = torch.finfo(torch.float32).bits//8
else:
bytes_per_token = torch.finfo(query.dtype).bits//8
batch_x_heads, q_tokens, _ = query.shape
_, _, k_tokens = key.shape
qk_matmul_size_bytes = batch_x_heads * bytes_per_token * q_tokens * k_tokens
mem_free_total, mem_free_torch = model_management.get_free_memory(query.device, True)
kv_chunk_size_min = None
kv_chunk_size = None
query_chunk_size = None
for x in [4096, 2048, 1024, 512, 256]:
count = mem_free_total / (batch_x_heads * bytes_per_token * x * 4.0)
if count >= k_tokens:
kv_chunk_size = k_tokens
query_chunk_size = x
break
if query_chunk_size is None:
query_chunk_size = 512
if mask is not None:
if len(mask.shape) == 2:
bs = 1
else:
bs = mask.shape[0]
mask = mask.reshape(bs, -1, mask.shape[-2], mask.shape[-1]).expand(b, heads, -1, -1).reshape(-1, mask.shape[-2], mask.shape[-1])
hidden_states = efficient_dot_product_attention(
query,
key,
value,
query_chunk_size=query_chunk_size,
kv_chunk_size=kv_chunk_size,
kv_chunk_size_min=kv_chunk_size_min,
use_checkpoint=False,
upcast_attention=upcast_attention,
mask=mask,
)
hidden_states = hidden_states.to(dtype)
hidden_states = hidden_states.unflatten(0, (-1, heads)).transpose(1,2).flatten(start_dim=2)
return hidden_states
def attention_split(q, k, v, heads, mask=None, attn_precision=None, skip_reshape=False):
attn_precision = get_attn_precision(attn_precision)
if skip_reshape:
b, _, _, dim_head = q.shape
else:
b, _, dim_head = q.shape
dim_head //= heads
scale = dim_head ** -0.5
h = heads
if skip_reshape:
q, k, v = map(
lambda t: t.reshape(b * heads, -1, dim_head),
(q, k, v),
)
else:
q, k, v = map(
lambda t: t.unsqueeze(3)
.reshape(b, -1, heads, dim_head)
.permute(0, 2, 1, 3)
.reshape(b * heads, -1, dim_head)
.contiguous(),
(q, k, v),
)
r1 = torch.zeros(q.shape[0], q.shape[1], v.shape[2], device=q.device, dtype=q.dtype)
mem_free_total = model_management.get_free_memory(q.device)
if attn_precision == torch.float32:
element_size = 4
upcast = True
else:
element_size = q.element_size()
upcast = False
gb = 1024 ** 3
tensor_size = q.shape[0] * q.shape[1] * k.shape[1] * element_size
modifier = 3
mem_required = tensor_size * modifier
steps = 1
if mem_required > mem_free_total:
steps = 2**(math.ceil(math.log(mem_required / mem_free_total, 2)))
# print(f"Expected tensor size:{tensor_size/gb:0.1f}GB, cuda free:{mem_free_cuda/gb:0.1f}GB "
# f"torch free:{mem_free_torch/gb:0.1f} total:{mem_free_total/gb:0.1f} steps:{steps}")
if steps > 64:
max_res = math.floor(math.sqrt(math.sqrt(mem_free_total / 2.5)) / 8) * 64
raise RuntimeError(f'Not enough memory, use lower resolution (max approx. {max_res}x{max_res}). '
f'Need: {mem_required/64/gb:0.1f}GB free, Have:{mem_free_total/gb:0.1f}GB free')
if mask is not None:
if len(mask.shape) == 2:
bs = 1
else:
bs = mask.shape[0]
mask = mask.reshape(bs, -1, mask.shape[-2], mask.shape[-1]).expand(b, heads, -1, -1).reshape(-1, mask.shape[-2], mask.shape[-1])
# print("steps", steps, mem_required, mem_free_total, modifier, q.element_size(), tensor_size)
first_op_done = False
cleared_cache = False
while True:
try:
slice_size = q.shape[1] // steps if (q.shape[1] % steps) == 0 else q.shape[1]
for i in range(0, q.shape[1], slice_size):
end = i + slice_size
if upcast:
with torch.autocast(enabled=False, device_type = 'cuda'):
s1 = einsum('b i d, b j d -> b i j', q[:, i:end].float(), k.float()) * scale
else:
s1 = einsum('b i d, b j d -> b i j', q[:, i:end], k) * scale
if mask is not None:
if len(mask.shape) == 2:
s1 += mask[i:end]
else:
s1 += mask[:, i:end]
s2 = s1.softmax(dim=-1).to(v.dtype)
del s1
first_op_done = True
r1[:, i:end] = einsum('b i j, b j d -> b i d', s2, v)
del s2
break
except model_management.OOM_EXCEPTION as e:
if first_op_done == False:
model_management.soft_empty_cache(True)
if cleared_cache == False:
cleared_cache = True
logging.warning("out of memory error, emptying cache and trying again")
continue
steps *= 2
if steps > 64:
raise e
logging.warning("out of memory error, increasing steps and trying again {}".format(steps))
else:
raise e
del q, k, v
r1 = (
r1.unsqueeze(0)
.reshape(b, heads, -1, dim_head)
.permute(0, 2, 1, 3)
.reshape(b, -1, heads * dim_head)
)
return r1
BROKEN_XFORMERS = False
try:
x_vers = xformers.__version__
# XFormers bug confirmed on all versions from 0.0.21 to 0.0.26 (q with bs bigger than 65535 gives CUDA error)
BROKEN_XFORMERS = x_vers.startswith("0.0.2") and not x_vers.startswith("0.0.20")
except:
pass
def attention_xformers(q, k, v, heads, mask=None, attn_precision=None, skip_reshape=False):
if skip_reshape:
b, _, _, dim_head = q.shape
else:
b, _, dim_head = q.shape
dim_head //= heads
disabled_xformers = False
if BROKEN_XFORMERS:
if b * heads > 65535:
disabled_xformers = True
if not disabled_xformers:
if torch.jit.is_tracing() or torch.jit.is_scripting():
disabled_xformers = True
if disabled_xformers:
return attention_pytorch(q, k, v, heads, mask)
if skip_reshape:
q, k, v = map(
lambda t: t.reshape(b * heads, -1, dim_head),
(q, k, v),
)
else:
q, k, v = map(
lambda t: t.reshape(b, -1, heads, dim_head),
(q, k, v),
)
if mask is not None:
pad = 8 - q.shape[1] % 8
mask_out = torch.empty([q.shape[0], q.shape[1], q.shape[1] + pad], dtype=q.dtype, device=q.device)
mask_out[:, :, :mask.shape[-1]] = mask
mask = mask_out[:, :, :mask.shape[-1]]
out = xformers.ops.memory_efficient_attention(q, k, v, attn_bias=mask)
if skip_reshape:
out = (
out.unsqueeze(0)
.reshape(b, heads, -1, dim_head)
.permute(0, 2, 1, 3)
.reshape(b, -1, heads * dim_head)
)
else:
out = (
out.reshape(b, -1, heads * dim_head)
)
return out
def attention_pytorch(q, k, v, heads, mask=None, attn_precision=None, skip_reshape=False):
if skip_reshape:
b, _, _, dim_head = q.shape
else:
b, _, dim_head = q.shape
dim_head //= heads
q, k, v = map(
lambda t: t.view(b, -1, heads, dim_head).transpose(1, 2),
(q, k, v),
)
out = torch.nn.functional.scaled_dot_product_attention(q, k, v, attn_mask=mask, dropout_p=0.0, is_causal=False)
out = (
out.transpose(1, 2).reshape(b, -1, heads * dim_head)
)
return out
optimized_attention = attention_basic
if model_management.xformers_enabled():
logging.info("Using xformers cross attention")
optimized_attention = attention_xformers
elif model_management.pytorch_attention_enabled():
logging.info("Using pytorch cross attention")
optimized_attention = attention_pytorch
else:
if args.use_split_cross_attention:
logging.info("Using split optimization for cross attention")
optimized_attention = attention_split
else:
logging.info("Using sub quadratic optimization for cross attention, if you have memory or speed issues try using: --use-split-cross-attention")
optimized_attention = attention_sub_quad
optimized_attention_masked = optimized_attention
def optimized_attention_for_device(device, mask=False, small_input=False):
if small_input:
if model_management.pytorch_attention_enabled():
return attention_pytorch #TODO: need to confirm but this is probably slightly faster for small inputs in all cases
else:
return attention_basic
if device == torch.device("cpu"):
return attention_sub_quad
if mask:
return optimized_attention_masked
return optimized_attention
class CrossAttention(nn.Module):
def __init__(self, query_dim, context_dim=None, heads=8, dim_head=64, dropout=0., attn_precision=None, dtype=None, device=None, operations=ops):
super().__init__()
inner_dim = dim_head * heads
context_dim = default(context_dim, query_dim)
self.attn_precision = attn_precision
self.heads = heads
self.dim_head = dim_head
self.to_q = operations.Linear(query_dim, inner_dim, bias=False, dtype=dtype, device=device)
self.to_k = operations.Linear(context_dim, inner_dim, bias=False, dtype=dtype, device=device)
self.to_v = operations.Linear(context_dim, inner_dim, bias=False, dtype=dtype, device=device)
self.to_out = nn.Sequential(operations.Linear(inner_dim, query_dim, dtype=dtype, device=device), nn.Dropout(dropout))
def forward(self, x, context=None, value=None, mask=None):
q = self.to_q(x)
context = default(context, x)
k = self.to_k(context)
if value is not None:
v = self.to_v(value)
del value
else:
v = self.to_v(context)
if mask is None:
out = optimized_attention(q, k, v, self.heads, attn_precision=self.attn_precision)
else:
out = optimized_attention_masked(q, k, v, self.heads, mask, attn_precision=self.attn_precision)
return self.to_out(out)
class BasicTransformerBlock(nn.Module):
def __init__(self, dim, n_heads, d_head, dropout=0., context_dim=None, gated_ff=True, checkpoint=True, ff_in=False, inner_dim=None,
disable_self_attn=False, disable_temporal_crossattention=False, switch_temporal_ca_to_sa=False, attn_precision=None, dtype=None, device=None, operations=ops):
super().__init__()
self.ff_in = ff_in or inner_dim is not None
if inner_dim is None:
inner_dim = dim
self.is_res = inner_dim == dim
self.attn_precision = attn_precision
if self.ff_in:
self.norm_in = operations.LayerNorm(dim, dtype=dtype, device=device)
self.ff_in = FeedForward(dim, dim_out=inner_dim, dropout=dropout, glu=gated_ff, dtype=dtype, device=device, operations=operations)
self.disable_self_attn = disable_self_attn
self.attn1 = CrossAttention(query_dim=inner_dim, heads=n_heads, dim_head=d_head, dropout=dropout,
context_dim=context_dim if self.disable_self_attn else None, attn_precision=self.attn_precision, dtype=dtype, device=device, operations=operations) # is a self-attention if not self.disable_self_attn
self.ff = FeedForward(inner_dim, dim_out=dim, dropout=dropout, glu=gated_ff, dtype=dtype, device=device, operations=operations)
if disable_temporal_crossattention:
if switch_temporal_ca_to_sa:
raise ValueError
else:
self.attn2 = None
else:
context_dim_attn2 = None
if not switch_temporal_ca_to_sa:
context_dim_attn2 = context_dim
self.attn2 = CrossAttention(query_dim=inner_dim, context_dim=context_dim_attn2,
heads=n_heads, dim_head=d_head, dropout=dropout, attn_precision=self.attn_precision, dtype=dtype, device=device, operations=operations) # is self-attn if context is none
self.norm2 = operations.LayerNorm(inner_dim, dtype=dtype, device=device)
self.norm1 = operations.LayerNorm(inner_dim, dtype=dtype, device=device)
self.norm3 = operations.LayerNorm(inner_dim, dtype=dtype, device=device)
self.n_heads = n_heads
self.d_head = d_head
self.switch_temporal_ca_to_sa = switch_temporal_ca_to_sa
def forward(self, x, context=None, transformer_options={}):
extra_options = {}
block = transformer_options.get("block", None)
block_index = transformer_options.get("block_index", 0)
transformer_patches = {}
transformer_patches_replace = {}
for k in transformer_options:
if k == "patches":
transformer_patches = transformer_options[k]
elif k == "patches_replace":
transformer_patches_replace = transformer_options[k]
else:
extra_options[k] = transformer_options[k]
extra_options["n_heads"] = self.n_heads
extra_options["dim_head"] = self.d_head
extra_options["attn_precision"] = self.attn_precision
if self.ff_in:
x_skip = x
x = self.ff_in(self.norm_in(x))
if self.is_res:
x += x_skip
n = self.norm1(x)
if self.disable_self_attn:
context_attn1 = context
else:
context_attn1 = None
value_attn1 = None
if "attn1_patch" in transformer_patches:
patch = transformer_patches["attn1_patch"]
if context_attn1 is None:
context_attn1 = n
value_attn1 = context_attn1
for p in patch:
n, context_attn1, value_attn1 = p(n, context_attn1, value_attn1, extra_options)
if block is not None:
transformer_block = (block[0], block[1], block_index)
else:
transformer_block = None
attn1_replace_patch = transformer_patches_replace.get("attn1", {})
block_attn1 = transformer_block
if block_attn1 not in attn1_replace_patch:
block_attn1 = block
if block_attn1 in attn1_replace_patch:
if context_attn1 is None:
context_attn1 = n
value_attn1 = n
n = self.attn1.to_q(n)
context_attn1 = self.attn1.to_k(context_attn1)
value_attn1 = self.attn1.to_v(value_attn1)
n = attn1_replace_patch[block_attn1](n, context_attn1, value_attn1, extra_options)
n = self.attn1.to_out(n)
else:
n = self.attn1(n, context=context_attn1, value=value_attn1)
if "attn1_output_patch" in transformer_patches:
patch = transformer_patches["attn1_output_patch"]
for p in patch:
n = p(n, extra_options)
x += n
if "middle_patch" in transformer_patches:
patch = transformer_patches["middle_patch"]
for p in patch:
x = p(x, extra_options)
if self.attn2 is not None:
n = self.norm2(x)
if self.switch_temporal_ca_to_sa:
context_attn2 = n
else:
context_attn2 = context
value_attn2 = None
if "attn2_patch" in transformer_patches:
patch = transformer_patches["attn2_patch"]
value_attn2 = context_attn2
for p in patch:
n, context_attn2, value_attn2 = p(n, context_attn2, value_attn2, extra_options)
attn2_replace_patch = transformer_patches_replace.get("attn2", {})
block_attn2 = transformer_block
if block_attn2 not in attn2_replace_patch:
block_attn2 = block
if block_attn2 in attn2_replace_patch:
if value_attn2 is None:
value_attn2 = context_attn2
n = self.attn2.to_q(n)
context_attn2 = self.attn2.to_k(context_attn2)
value_attn2 = self.attn2.to_v(value_attn2)
n = attn2_replace_patch[block_attn2](n, context_attn2, value_attn2, extra_options)
n = self.attn2.to_out(n)
else:
n = self.attn2(n, context=context_attn2, value=value_attn2)
if "attn2_output_patch" in transformer_patches:
patch = transformer_patches["attn2_output_patch"]
for p in patch:
n = p(n, extra_options)
x += n
if self.is_res:
x_skip = x
x = self.ff(self.norm3(x))
if self.is_res:
x += x_skip
return x
class SpatialTransformer(nn.Module):
"""
Transformer block for image-like data.
First, project the input (aka embedding)
and reshape to b, t, d.
Then apply standard transformer action.
Finally, reshape to image
NEW: use_linear for more efficiency instead of the 1x1 convs
"""
def __init__(self, in_channels, n_heads, d_head,
depth=1, dropout=0., context_dim=None,
disable_self_attn=False, use_linear=False,
use_checkpoint=True, attn_precision=None, dtype=None, device=None, operations=ops):
super().__init__()
if exists(context_dim) and not isinstance(context_dim, list):
context_dim = [context_dim] * depth
self.in_channels = in_channels
inner_dim = n_heads * d_head
self.norm = operations.GroupNorm(num_groups=32, num_channels=in_channels, eps=1e-6, affine=True, dtype=dtype, device=device)
if not use_linear:
self.proj_in = operations.Conv2d(in_channels,
inner_dim,
kernel_size=1,
stride=1,
padding=0, dtype=dtype, device=device)
else:
self.proj_in = operations.Linear(in_channels, inner_dim, dtype=dtype, device=device)
self.transformer_blocks = nn.ModuleList(
[BasicTransformerBlock(inner_dim, n_heads, d_head, dropout=dropout, context_dim=context_dim[d],
disable_self_attn=disable_self_attn, checkpoint=use_checkpoint, attn_precision=attn_precision, dtype=dtype, device=device, operations=operations)
for d in range(depth)]
)
if not use_linear:
self.proj_out = operations.Conv2d(inner_dim,in_channels,
kernel_size=1,
stride=1,
padding=0, dtype=dtype, device=device)
else:
self.proj_out = operations.Linear(in_channels, inner_dim, dtype=dtype, device=device)
self.use_linear = use_linear
def forward(self, x, context=None, transformer_options={}):
# note: if no context is given, cross-attention defaults to self-attention
if not isinstance(context, list):
context = [context] * len(self.transformer_blocks)
b, c, h, w = x.shape
x_in = x
x = self.norm(x)
if not self.use_linear:
x = self.proj_in(x)
x = x.movedim(1, 3).flatten(1, 2).contiguous()
if self.use_linear:
x = self.proj_in(x)
for i, block in enumerate(self.transformer_blocks):
transformer_options["block_index"] = i
x = block(x, context=context[i], transformer_options=transformer_options)
if self.use_linear:
x = self.proj_out(x)
x = x.reshape(x.shape[0], h, w, x.shape[-1]).movedim(3, 1).contiguous()
if not self.use_linear:
x = self.proj_out(x)
return x + x_in
class SpatialVideoTransformer(SpatialTransformer):
def __init__(
self,
in_channels,
n_heads,
d_head,
depth=1,
dropout=0.0,
use_linear=False,
context_dim=None,
use_spatial_context=False,
timesteps=None,
merge_strategy: str = "fixed",
merge_factor: float = 0.5,
time_context_dim=None,
ff_in=False,
checkpoint=False,
time_depth=1,
disable_self_attn=False,
disable_temporal_crossattention=False,
max_time_embed_period: int = 10000,
attn_precision=None,
dtype=None, device=None, operations=ops
):
super().__init__(
in_channels,
n_heads,
d_head,
depth=depth,
dropout=dropout,
use_checkpoint=checkpoint,
context_dim=context_dim,
use_linear=use_linear,
disable_self_attn=disable_self_attn,
attn_precision=attn_precision,
dtype=dtype, device=device, operations=operations
)
self.time_depth = time_depth
self.depth = depth
self.max_time_embed_period = max_time_embed_period
time_mix_d_head = d_head
n_time_mix_heads = n_heads
time_mix_inner_dim = int(time_mix_d_head * n_time_mix_heads)
inner_dim = n_heads * d_head
if use_spatial_context:
time_context_dim = context_dim
self.time_stack = nn.ModuleList(
[
BasicTransformerBlock(
inner_dim,
n_time_mix_heads,
time_mix_d_head,
dropout=dropout,
context_dim=time_context_dim,
# timesteps=timesteps,
checkpoint=checkpoint,
ff_in=ff_in,
inner_dim=time_mix_inner_dim,
disable_self_attn=disable_self_attn,
disable_temporal_crossattention=disable_temporal_crossattention,
attn_precision=attn_precision,
dtype=dtype, device=device, operations=operations
)
for _ in range(self.depth)
]
)
assert len(self.time_stack) == len(self.transformer_blocks)
self.use_spatial_context = use_spatial_context
self.in_channels = in_channels
time_embed_dim = self.in_channels * 4
self.time_pos_embed = nn.Sequential(
operations.Linear(self.in_channels, time_embed_dim, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(time_embed_dim, self.in_channels, dtype=dtype, device=device),
)
self.time_mixer = AlphaBlender(
alpha=merge_factor, merge_strategy=merge_strategy
)
def forward(
self,
x: torch.Tensor,
context: Optional[torch.Tensor] = None,
time_context: Optional[torch.Tensor] = None,
timesteps: Optional[int] = None,
image_only_indicator: Optional[torch.Tensor] = None,
transformer_options={}
) -> torch.Tensor:
_, _, h, w = x.shape
x_in = x
spatial_context = None
if exists(context):
spatial_context = context
if self.use_spatial_context:
assert (
context.ndim == 3
), f"n dims of spatial context should be 3 but are {context.ndim}"
if time_context is None:
time_context = context
time_context_first_timestep = time_context[::timesteps]
time_context = repeat(
time_context_first_timestep, "b ... -> (b n) ...", n=h * w
)
elif time_context is not None and not self.use_spatial_context:
time_context = repeat(time_context, "b ... -> (b n) ...", n=h * w)
if time_context.ndim == 2:
time_context = rearrange(time_context, "b c -> b 1 c")
x = self.norm(x)
if not self.use_linear:
x = self.proj_in(x)
x = rearrange(x, "b c h w -> b (h w) c")
if self.use_linear:
x = self.proj_in(x)
num_frames = torch.arange(timesteps, device=x.device)
num_frames = repeat(num_frames, "t -> b t", b=x.shape[0] // timesteps)
num_frames = rearrange(num_frames, "b t -> (b t)")
t_emb = timestep_embedding(num_frames, self.in_channels, repeat_only=False, max_period=self.max_time_embed_period).to(x.dtype)
emb = self.time_pos_embed(t_emb)
emb = emb[:, None, :]
for it_, (block, mix_block) in enumerate(
zip(self.transformer_blocks, self.time_stack)
):
transformer_options["block_index"] = it_
x = block(
x,
context=spatial_context,
transformer_options=transformer_options,
)
x_mix = x
x_mix = x_mix + emb
B, S, C = x_mix.shape
x_mix = rearrange(x_mix, "(b t) s c -> (b s) t c", t=timesteps)
x_mix = mix_block(x_mix, context=time_context) #TODO: transformer_options
x_mix = rearrange(
x_mix, "(b s) t c -> (b t) s c", s=S, b=B // timesteps, c=C, t=timesteps
)
x = self.time_mixer(x_spatial=x, x_temporal=x_mix, image_only_indicator=image_only_indicator)
if self.use_linear:
x = self.proj_out(x)
x = rearrange(x, "b (h w) c -> b c h w", h=h, w=w)
if not self.use_linear:
x = self.proj_out(x)
out = x + x_in
return out

0
comfy/ldm/modules/diffusionmodules/__init__.py Normal file
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956
comfy/ldm/modules/diffusionmodules/mmdit.py Normal file
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@@ -0,0 +1,956 @@
import logging
import math
from typing import Dict, Optional
import numpy as np
import torch
import torch.nn as nn
from .. import attention
from einops import rearrange, repeat
from .util import timestep_embedding
import comfy.ops
def default(x, y):
if x is not None:
return x
return y
class Mlp(nn.Module):
""" MLP as used in Vision Transformer, MLP-Mixer and related networks
"""
def __init__(
self,
in_features,
hidden_features=None,
out_features=None,
act_layer=nn.GELU,
norm_layer=None,
bias=True,
drop=0.,
use_conv=False,
dtype=None,
device=None,
operations=None,
):
super().__init__()
out_features = out_features or in_features
hidden_features = hidden_features or in_features
drop_probs = drop
linear_layer = partial(operations.Conv2d, kernel_size=1) if use_conv else operations.Linear
self.fc1 = linear_layer(in_features, hidden_features, bias=bias, dtype=dtype, device=device)
self.act = act_layer()
self.drop1 = nn.Dropout(drop_probs)
self.norm = norm_layer(hidden_features) if norm_layer is not None else nn.Identity()
self.fc2 = linear_layer(hidden_features, out_features, bias=bias, dtype=dtype, device=device)
self.drop2 = nn.Dropout(drop_probs)
def forward(self, x):
x = self.fc1(x)
x = self.act(x)
x = self.drop1(x)
x = self.norm(x)
x = self.fc2(x)
x = self.drop2(x)
return x
class PatchEmbed(nn.Module):
""" 2D Image to Patch Embedding
"""
dynamic_img_pad: torch.jit.Final[bool]
def __init__(
self,
img_size: Optional[int] = 224,
patch_size: int = 16,
in_chans: int = 3,
embed_dim: int = 768,
norm_layer = None,
flatten: bool = True,
bias: bool = True,
strict_img_size: bool = True,
dynamic_img_pad: bool = True,
padding_mode='circular',
dtype=None,
device=None,
operations=None,
):
super().__init__()
self.patch_size = (patch_size, patch_size)
self.padding_mode = padding_mode
if img_size is not None:
self.img_size = (img_size, img_size)
self.grid_size = tuple([s // p for s, p in zip(self.img_size, self.patch_size)])
self.num_patches = self.grid_size[0] * self.grid_size[1]
else:
self.img_size = None
self.grid_size = None
self.num_patches = None
# flatten spatial dim and transpose to channels last, kept for bwd compat
self.flatten = flatten
self.strict_img_size = strict_img_size
self.dynamic_img_pad = dynamic_img_pad
self.proj = operations.Conv2d(in_chans, embed_dim, kernel_size=patch_size, stride=patch_size, bias=bias, dtype=dtype, device=device)
self.norm = norm_layer(embed_dim) if norm_layer else nn.Identity()
def forward(self, x):
B, C, H, W = x.shape
# if self.img_size is not None:
# if self.strict_img_size:
# _assert(H == self.img_size[0], f"Input height ({H}) doesn't match model ({self.img_size[0]}).")
# _assert(W == self.img_size[1], f"Input width ({W}) doesn't match model ({self.img_size[1]}).")
# elif not self.dynamic_img_pad:
# _assert(
# H % self.patch_size[0] == 0,
# f"Input height ({H}) should be divisible by patch size ({self.patch_size[0]})."
# )
# _assert(
# W % self.patch_size[1] == 0,
# f"Input width ({W}) should be divisible by patch size ({self.patch_size[1]})."
# )
if self.dynamic_img_pad:
pad_h = (self.patch_size[0] - H % self.patch_size[0]) % self.patch_size[0]
pad_w = (self.patch_size[1] - W % self.patch_size[1]) % self.patch_size[1]
x = torch.nn.functional.pad(x, (0, pad_w, 0, pad_h), mode=self.padding_mode)
x = self.proj(x)
if self.flatten:
x = x.flatten(2).transpose(1, 2) # NCHW -> NLC
x = self.norm(x)
return x
def modulate(x, shift, scale):
if shift is None:
shift = torch.zeros_like(scale)
return x * (1 + scale.unsqueeze(1)) + shift.unsqueeze(1)
#################################################################################
# Sine/Cosine Positional Embedding Functions #
#################################################################################
def get_2d_sincos_pos_embed(
embed_dim,
grid_size,
cls_token=False,
extra_tokens=0,
scaling_factor=None,
offset=None,
):
"""
grid_size: int of the grid height and width
return:
pos_embed: [grid_size*grid_size, embed_dim] or [1+grid_size*grid_size, embed_dim] (w/ or w/o cls_token)
"""
grid_h = np.arange(grid_size, dtype=np.float32)
grid_w = np.arange(grid_size, dtype=np.float32)
grid = np.meshgrid(grid_w, grid_h) # here w goes first
grid = np.stack(grid, axis=0)
if scaling_factor is not None:
grid = grid / scaling_factor
if offset is not None:
grid = grid - offset
grid = grid.reshape([2, 1, grid_size, grid_size])
pos_embed = get_2d_sincos_pos_embed_from_grid(embed_dim, grid)
if cls_token and extra_tokens > 0:
pos_embed = np.concatenate(
[np.zeros([extra_tokens, embed_dim]), pos_embed], axis=0
)
return pos_embed
def get_2d_sincos_pos_embed_from_grid(embed_dim, grid):
assert embed_dim % 2 == 0
# use half of dimensions to encode grid_h
emb_h = get_1d_sincos_pos_embed_from_grid(embed_dim // 2, grid[0]) # (H*W, D/2)
emb_w = get_1d_sincos_pos_embed_from_grid(embed_dim // 2, grid[1]) # (H*W, D/2)
emb = np.concatenate([emb_h, emb_w], axis=1) # (H*W, D)
return emb
def get_1d_sincos_pos_embed_from_grid(embed_dim, pos):
"""
embed_dim: output dimension for each position
pos: a list of positions to be encoded: size (M,)
out: (M, D)
"""
assert embed_dim % 2 == 0
omega = np.arange(embed_dim // 2, dtype=np.float64)
omega /= embed_dim / 2.0
omega = 1.0 / 10000**omega # (D/2,)
pos = pos.reshape(-1) # (M,)
out = np.einsum("m,d->md", pos, omega) # (M, D/2), outer product
emb_sin = np.sin(out) # (M, D/2)
emb_cos = np.cos(out) # (M, D/2)
emb = np.concatenate([emb_sin, emb_cos], axis=1) # (M, D)
return emb
def get_1d_sincos_pos_embed_from_grid_torch(embed_dim, pos, device=None, dtype=torch.float32):
omega = torch.arange(embed_dim // 2, device=device, dtype=dtype)
omega /= embed_dim / 2.0
omega = 1.0 / 10000**omega # (D/2,)
pos = pos.reshape(-1) # (M,)
out = torch.einsum("m,d->md", pos, omega) # (M, D/2), outer product
emb_sin = torch.sin(out) # (M, D/2)
emb_cos = torch.cos(out) # (M, D/2)
emb = torch.cat([emb_sin, emb_cos], dim=1) # (M, D)
return emb
def get_2d_sincos_pos_embed_torch(embed_dim, w, h, val_center=7.5, val_magnitude=7.5, device=None, dtype=torch.float32):
small = min(h, w)
val_h = (h / small) * val_magnitude
val_w = (w / small) * val_magnitude
grid_h, grid_w = torch.meshgrid(torch.linspace(-val_h + val_center, val_h + val_center, h, device=device, dtype=dtype), torch.linspace(-val_w + val_center, val_w + val_center, w, device=device, dtype=dtype), indexing='ij')
emb_h = get_1d_sincos_pos_embed_from_grid_torch(embed_dim // 2, grid_h, device=device, dtype=dtype)
emb_w = get_1d_sincos_pos_embed_from_grid_torch(embed_dim // 2, grid_w, device=device, dtype=dtype)
emb = torch.cat([emb_w, emb_h], dim=1) # (H*W, D)
return emb
#################################################################################
# Embedding Layers for Timesteps and Class Labels #
#################################################################################
class TimestepEmbedder(nn.Module):
"""
Embeds scalar timesteps into vector representations.
"""
def __init__(self, hidden_size, frequency_embedding_size=256, dtype=None, device=None, operations=None):
super().__init__()
self.mlp = nn.Sequential(
operations.Linear(frequency_embedding_size, hidden_size, bias=True, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(hidden_size, hidden_size, bias=True, dtype=dtype, device=device),
)
self.frequency_embedding_size = frequency_embedding_size
def forward(self, t, dtype, **kwargs):
t_freq = timestep_embedding(t, self.frequency_embedding_size).to(dtype)
t_emb = self.mlp(t_freq)
return t_emb
class VectorEmbedder(nn.Module):
"""
Embeds a flat vector of dimension input_dim
"""
def __init__(self, input_dim: int, hidden_size: int, dtype=None, device=None, operations=None):
super().__init__()
self.mlp = nn.Sequential(
operations.Linear(input_dim, hidden_size, bias=True, dtype=dtype, device=device),
nn.SiLU(),
operations.Linear(hidden_size, hidden_size, bias=True, dtype=dtype, device=device),
)
def forward(self, x: torch.Tensor) -> torch.Tensor:
emb = self.mlp(x)
return emb
#################################################################################
# Core DiT Model #
#################################################################################
def split_qkv(qkv, head_dim):
qkv = qkv.reshape(qkv.shape[0], qkv.shape[1], 3, -1, head_dim).movedim(2, 0)
return qkv[0], qkv[1], qkv[2]
def optimized_attention(qkv, num_heads):
return attention.optimized_attention(qkv[0], qkv[1], qkv[2], num_heads)
class SelfAttention(nn.Module):
ATTENTION_MODES = ("xformers", "torch", "torch-hb", "math", "debug")
def __init__(
self,
dim: int,
num_heads: int = 8,
qkv_bias: bool = False,
qk_scale: Optional[float] = None,
proj_drop: float = 0.0,
attn_mode: str = "xformers",
pre_only: bool = False,
qk_norm: Optional[str] = None,
rmsnorm: bool = False,
dtype=None,
device=None,
operations=None,
):
super().__init__()
self.num_heads = num_heads
self.head_dim = dim // num_heads
self.qkv = operations.Linear(dim, dim * 3, bias=qkv_bias, dtype=dtype, device=device)
if not pre_only:
self.proj = operations.Linear(dim, dim, dtype=dtype, device=device)
self.proj_drop = nn.Dropout(proj_drop)
assert attn_mode in self.ATTENTION_MODES
self.attn_mode = attn_mode
self.pre_only = pre_only
if qk_norm == "rms":
self.ln_q = RMSNorm(self.head_dim, elementwise_affine=True, eps=1.0e-6, dtype=dtype, device=device)
self.ln_k = RMSNorm(self.head_dim, elementwise_affine=True, eps=1.0e-6, dtype=dtype, device=device)
elif qk_norm == "ln":
self.ln_q = operations.LayerNorm(self.head_dim, elementwise_affine=True, eps=1.0e-6, dtype=dtype, device=device)
self.ln_k = operations.LayerNorm(self.head_dim, elementwise_affine=True, eps=1.0e-6, dtype=dtype, device=device)
elif qk_norm is None:
self.ln_q = nn.Identity()
self.ln_k = nn.Identity()
else:
raise ValueError(qk_norm)
def pre_attention(self, x: torch.Tensor) -> torch.Tensor:
B, L, C = x.shape
qkv = self.qkv(x)
q, k, v = split_qkv(qkv, self.head_dim)
q = self.ln_q(q).reshape(q.shape[0], q.shape[1], -1)
k = self.ln_k(k).reshape(q.shape[0], q.shape[1], -1)
return (q, k, v)
def post_attention(self, x: torch.Tensor) -> torch.Tensor:
assert not self.pre_only
x = self.proj(x)
x = self.proj_drop(x)
return x
def forward(self, x: torch.Tensor) -> torch.Tensor:
qkv = self.pre_attention(x)
x = optimized_attention(
qkv, num_heads=self.num_heads
)
x = self.post_attention(x)
return x
class RMSNorm(torch.nn.Module):
def __init__(
self, dim: int, elementwise_affine: bool = False, eps: float = 1e-6, device=None, dtype=None
):
"""
Initialize the RMSNorm normalization layer.
Args:
dim (int): The dimension of the input tensor.
eps (float, optional): A small value added to the denominator for numerical stability. Default is 1e-6.
Attributes:
eps (float): A small value added to the denominator for numerical stability.
weight (nn.Parameter): Learnable scaling parameter.
"""
super().__init__()
self.eps = eps
self.learnable_scale = elementwise_affine
if self.learnable_scale:
self.weight = nn.Parameter(torch.empty(dim, device=device, dtype=dtype))
else:
self.register_parameter("weight", None)
def _norm(self, x):
"""
Apply the RMSNorm normalization to the input tensor.
Args:
x (torch.Tensor): The input tensor.
Returns:
torch.Tensor: The normalized tensor.
"""
return x * torch.rsqrt(x.pow(2).mean(-1, keepdim=True) + self.eps)
def forward(self, x):
"""
Forward pass through the RMSNorm layer.
Args:
x (torch.Tensor): The input tensor.
Returns:
torch.Tensor: The output tensor after applying RMSNorm.
"""
x = self._norm(x)
if self.learnable_scale:
return x * self.weight.to(device=x.device, dtype=x.dtype)
else:
return x
class SwiGLUFeedForward(nn.Module):
def __init__(
self,
dim: int,
hidden_dim: int,
multiple_of: int,
ffn_dim_multiplier: Optional[float] = None,
):
"""
Initialize the FeedForward module.
Args:
dim (int): Input dimension.
hidden_dim (int): Hidden dimension of the feedforward layer.
multiple_of (int): Value to ensure hidden dimension is a multiple of this value.
ffn_dim_multiplier (float, optional): Custom multiplier for hidden dimension. Defaults to None.
Attributes:
w1 (ColumnParallelLinear): Linear transformation for the first layer.
w2 (RowParallelLinear): Linear transformation for the second layer.
w3 (ColumnParallelLinear): Linear transformation for the third layer.
"""
super().__init__()
hidden_dim = int(2 * hidden_dim / 3)
# custom dim factor multiplier
if ffn_dim_multiplier is not None:
hidden_dim = int(ffn_dim_multiplier * hidden_dim)
hidden_dim = multiple_of * ((hidden_dim + multiple_of - 1) // multiple_of)
self.w1 = nn.Linear(dim, hidden_dim, bias=False)
self.w2 = nn.Linear(hidden_dim, dim, bias=False)
self.w3 = nn.Linear(dim, hidden_dim, bias=False)
def forward(self, x):
return self.w2(nn.functional.silu(self.w1(x)) * self.w3(x))
class DismantledBlock(nn.Module):
"""
A DiT block with gated adaptive layer norm (adaLN) conditioning.
"""
ATTENTION_MODES = ("xformers", "torch", "torch-hb", "math", "debug")
def __init__(
self,
hidden_size: int,
num_heads: int,
mlp_ratio: float = 4.0,
attn_mode: str = "xformers",
qkv_bias: bool = False,
pre_only: bool = False,
rmsnorm: bool = False,
scale_mod_only: bool = False,
swiglu: bool = False,
qk_norm: Optional[str] = None,
dtype=None,
device=None,
operations=None,
**block_kwargs,
):
super().__init__()
assert attn_mode in self.ATTENTION_MODES
if not rmsnorm:
self.norm1 = operations.LayerNorm(hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
else:
self.norm1 = RMSNorm(hidden_size, elementwise_affine=False, eps=1e-6)
self.attn = SelfAttention(
dim=hidden_size,
num_heads=num_heads,
qkv_bias=qkv_bias,
attn_mode=attn_mode,
pre_only=pre_only,
qk_norm=qk_norm,
rmsnorm=rmsnorm,
dtype=dtype,
device=device,
operations=operations
)
if not pre_only:
if not rmsnorm:
self.norm2 = operations.LayerNorm(
hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device
)
else:
self.norm2 = RMSNorm(hidden_size, elementwise_affine=False, eps=1e-6)
mlp_hidden_dim = int(hidden_size * mlp_ratio)
if not pre_only:
if not swiglu:
self.mlp = Mlp(
in_features=hidden_size,
hidden_features=mlp_hidden_dim,
act_layer=lambda: nn.GELU(approximate="tanh"),
drop=0,
dtype=dtype,
device=device,
operations=operations
)
else:
self.mlp = SwiGLUFeedForward(
dim=hidden_size,
hidden_dim=mlp_hidden_dim,
multiple_of=256,
)
self.scale_mod_only = scale_mod_only
if not scale_mod_only:
n_mods = 6 if not pre_only else 2
else:
n_mods = 4 if not pre_only else 1
self.adaLN_modulation = nn.Sequential(
nn.SiLU(), operations.Linear(hidden_size, n_mods * hidden_size, bias=True, dtype=dtype, device=device)
)
self.pre_only = pre_only
def pre_attention(self, x: torch.Tensor, c: torch.Tensor) -> torch.Tensor:
if not self.pre_only:
if not self.scale_mod_only:
(
shift_msa,
scale_msa,
gate_msa,
shift_mlp,
scale_mlp,
gate_mlp,
) = self.adaLN_modulation(c).chunk(6, dim=1)
else:
shift_msa = None
shift_mlp = None
(
scale_msa,
gate_msa,
scale_mlp,
gate_mlp,
) = self.adaLN_modulation(
c
).chunk(4, dim=1)
qkv = self.attn.pre_attention(modulate(self.norm1(x), shift_msa, scale_msa))
return qkv, (
x,
gate_msa,
shift_mlp,
scale_mlp,
gate_mlp,
)
else:
if not self.scale_mod_only:
(
shift_msa,
scale_msa,
) = self.adaLN_modulation(
c
).chunk(2, dim=1)
else:
shift_msa = None
scale_msa = self.adaLN_modulation(c)
qkv = self.attn.pre_attention(modulate(self.norm1(x), shift_msa, scale_msa))
return qkv, None
def post_attention(self, attn, x, gate_msa, shift_mlp, scale_mlp, gate_mlp):
assert not self.pre_only
x = x + gate_msa.unsqueeze(1) * self.attn.post_attention(attn)
x = x + gate_mlp.unsqueeze(1) * self.mlp(
modulate(self.norm2(x), shift_mlp, scale_mlp)
)
return x
def forward(self, x: torch.Tensor, c: torch.Tensor) -> torch.Tensor:
assert not self.pre_only
qkv, intermediates = self.pre_attention(x, c)
attn = optimized_attention(
qkv,
num_heads=self.attn.num_heads,
)
return self.post_attention(attn, *intermediates)
def block_mixing(*args, use_checkpoint=True, **kwargs):
if use_checkpoint:
return torch.utils.checkpoint.checkpoint(
_block_mixing, *args, use_reentrant=False, **kwargs
)
else:
return _block_mixing(*args, **kwargs)
def _block_mixing(context, x, context_block, x_block, c):
context_qkv, context_intermediates = context_block.pre_attention(context, c)
x_qkv, x_intermediates = x_block.pre_attention(x, c)
o = []
for t in range(3):
o.append(torch.cat((context_qkv[t], x_qkv[t]), dim=1))
qkv = tuple(o)
attn = optimized_attention(
qkv,
num_heads=x_block.attn.num_heads,
)
context_attn, x_attn = (
attn[:, : context_qkv[0].shape[1]],
attn[:, context_qkv[0].shape[1] :],
)
if not context_block.pre_only:
context = context_block.post_attention(context_attn, *context_intermediates)
else:
context = None
x = x_block.post_attention(x_attn, *x_intermediates)
return context, x
class JointBlock(nn.Module):
"""just a small wrapper to serve as a fsdp unit"""
def __init__(
self,
*args,
**kwargs,
):
super().__init__()
pre_only = kwargs.pop("pre_only")
qk_norm = kwargs.pop("qk_norm", None)
self.context_block = DismantledBlock(*args, pre_only=pre_only, qk_norm=qk_norm, **kwargs)
self.x_block = DismantledBlock(*args, pre_only=False, qk_norm=qk_norm, **kwargs)
def forward(self, *args, **kwargs):
return block_mixing(
*args, context_block=self.context_block, x_block=self.x_block, **kwargs
)
class FinalLayer(nn.Module):
"""
The final layer of DiT.
"""
def __init__(
self,
hidden_size: int,
patch_size: int,
out_channels: int,
total_out_channels: Optional[int] = None,
dtype=None,
device=None,
operations=None,
):
super().__init__()
self.norm_final = operations.LayerNorm(hidden_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.linear = (
operations.Linear(hidden_size, patch_size * patch_size * out_channels, bias=True, dtype=dtype, device=device)
if (total_out_channels is None)
else operations.Linear(hidden_size, total_out_channels, bias=True, dtype=dtype, device=device)
)
self.adaLN_modulation = nn.Sequential(
nn.SiLU(), operations.Linear(hidden_size, 2 * hidden_size, bias=True, dtype=dtype, device=device)
)
def forward(self, x: torch.Tensor, c: torch.Tensor) -> torch.Tensor:
shift, scale = self.adaLN_modulation(c).chunk(2, dim=1)
x = modulate(self.norm_final(x), shift, scale)
x = self.linear(x)
return x
class SelfAttentionContext(nn.Module):
def __init__(self, dim, heads=8, dim_head=64, dtype=None, device=None, operations=None):
super().__init__()
dim_head = dim // heads
inner_dim = dim
self.heads = heads
self.dim_head = dim_head
self.qkv = operations.Linear(dim, dim * 3, bias=True, dtype=dtype, device=device)
self.proj = operations.Linear(inner_dim, dim, dtype=dtype, device=device)
def forward(self, x):
qkv = self.qkv(x)
q, k, v = split_qkv(qkv, self.dim_head)
x = optimized_attention((q.reshape(q.shape[0], q.shape[1], -1), k, v), self.heads)
return self.proj(x)
class ContextProcessorBlock(nn.Module):
def __init__(self, context_size, dtype=None, device=None, operations=None):
super().__init__()
self.norm1 = operations.LayerNorm(context_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.attn = SelfAttentionContext(context_size, dtype=dtype, device=device, operations=operations)
self.norm2 = operations.LayerNorm(context_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
self.mlp = Mlp(in_features=context_size, hidden_features=(context_size * 4), act_layer=lambda: nn.GELU(approximate="tanh"), drop=0, dtype=dtype, device=device, operations=operations)
def forward(self, x):
x += self.attn(self.norm1(x))
x += self.mlp(self.norm2(x))
return x
class ContextProcessor(nn.Module):
def __init__(self, context_size, num_layers, dtype=None, device=None, operations=None):
super().__init__()
self.layers = torch.nn.ModuleList([ContextProcessorBlock(context_size, dtype=dtype, device=device, operations=operations) for i in range(num_layers)])
self.norm = operations.LayerNorm(context_size, elementwise_affine=False, eps=1e-6, dtype=dtype, device=device)
def forward(self, x):
for i, l in enumerate(self.layers):
x = l(x)
return self.norm(x)
class MMDiT(nn.Module):
"""
Diffusion model with a Transformer backbone.
"""
def __init__(
self,
input_size: int = 32,
patch_size: int = 2,
in_channels: int = 4,
depth: int = 28,
# hidden_size: Optional[int] = None,
# num_heads: Optional[int] = None,
mlp_ratio: float = 4.0,
learn_sigma: bool = False,
adm_in_channels: Optional[int] = None,
context_embedder_config: Optional[Dict] = None,
compile_core: bool = False,
use_checkpoint: bool = False,
register_length: int = 0,
attn_mode: str = "torch",
rmsnorm: bool = False,
scale_mod_only: bool = False,
swiglu: bool = False,
out_channels: Optional[int] = None,
pos_embed_scaling_factor: Optional[float] = None,
pos_embed_offset: Optional[float] = None,
pos_embed_max_size: Optional[int] = None,
num_patches = None,
qk_norm: Optional[str] = None,
qkv_bias: bool = True,
context_processor_layers = None,
context_size = 4096,
num_blocks = None,
final_layer = True,
dtype = None, #TODO
device = None,
operations = None,
):
super().__init__()
self.dtype = dtype
self.learn_sigma = learn_sigma
self.in_channels = in_channels
default_out_channels = in_channels * 2 if learn_sigma else in_channels
self.out_channels = default(out_channels, default_out_channels)
self.patch_size = patch_size
self.pos_embed_scaling_factor = pos_embed_scaling_factor
self.pos_embed_offset = pos_embed_offset
self.pos_embed_max_size = pos_embed_max_size
# hidden_size = default(hidden_size, 64 * depth)
# num_heads = default(num_heads, hidden_size // 64)
# apply magic --> this defines a head_size of 64
self.hidden_size = 64 * depth
num_heads = depth
if num_blocks is None:
num_blocks = depth
self.depth = depth
self.num_heads = num_heads
self.x_embedder = PatchEmbed(
input_size,
patch_size,
in_channels,
self.hidden_size,
bias=True,
strict_img_size=self.pos_embed_max_size is None,
dtype=dtype,
device=device,
operations=operations
)
self.t_embedder = TimestepEmbedder(self.hidden_size, dtype=dtype, device=device, operations=operations)
self.y_embedder = None
if adm_in_channels is not None:
assert isinstance(adm_in_channels, int)
self.y_embedder = VectorEmbedder(adm_in_channels, self.hidden_size, dtype=dtype, device=device, operations=operations)
if context_processor_layers is not None:
self.context_processor = ContextProcessor(context_size, context_processor_layers, dtype=dtype, device=device, operations=operations)
else:
self.context_processor = None
self.context_embedder = nn.Identity()
if context_embedder_config is not None:
if context_embedder_config["target"] == "torch.nn.Linear":
self.context_embedder = operations.Linear(**context_embedder_config["params"], dtype=dtype, device=device)
self.register_length = register_length
if self.register_length > 0:
self.register = nn.Parameter(torch.randn(1, register_length, self.hidden_size, dtype=dtype, device=device))
# num_patches = self.x_embedder.num_patches
# Will use fixed sin-cos embedding:
# just use a buffer already
if num_patches is not None:
self.register_buffer(
"pos_embed",
torch.empty(1, num_patches, self.hidden_size, dtype=dtype, device=device),
)
else:
self.pos_embed = None
self.use_checkpoint = use_checkpoint
self.joint_blocks = nn.ModuleList(
[
JointBlock(
self.hidden_size,
num_heads,
mlp_ratio=mlp_ratio,
qkv_bias=qkv_bias,
attn_mode=attn_mode,
pre_only=(i == num_blocks - 1) and final_layer,
rmsnorm=rmsnorm,
scale_mod_only=scale_mod_only,
swiglu=swiglu,
qk_norm=qk_norm,
dtype=dtype,
device=device,
operations=operations
)
for i in range(num_blocks)
]
)
if final_layer:
self.final_layer = FinalLayer(self.hidden_size, patch_size, self.out_channels, dtype=dtype, device=device, operations=operations)
if compile_core:
assert False
self.forward_core_with_concat = torch.compile(self.forward_core_with_concat)
def cropped_pos_embed(self, hw, device=None):
p = self.x_embedder.patch_size[0]
h, w = hw
# patched size
h = (h + 1) // p
w = (w + 1) // p
if self.pos_embed is None:
return get_2d_sincos_pos_embed_torch(self.hidden_size, w, h, device=device)
assert self.pos_embed_max_size is not None
assert h <= self.pos_embed_max_size, (h, self.pos_embed_max_size)
assert w <= self.pos_embed_max_size, (w, self.pos_embed_max_size)
top = (self.pos_embed_max_size - h) // 2
left = (self.pos_embed_max_size - w) // 2
spatial_pos_embed = rearrange(
self.pos_embed,
"1 (h w) c -> 1 h w c",
h=self.pos_embed_max_size,
w=self.pos_embed_max_size,
)
spatial_pos_embed = spatial_pos_embed[:, top : top + h, left : left + w, :]
spatial_pos_embed = rearrange(spatial_pos_embed, "1 h w c -> 1 (h w) c")
# print(spatial_pos_embed, top, left, h, w)
# # t = get_2d_sincos_pos_embed_torch(self.hidden_size, w, h, 7.875, 7.875, device=device) #matches exactly for 1024 res
# t = get_2d_sincos_pos_embed_torch(self.hidden_size, w, h, 7.5, 7.5, device=device) #scales better
# # print(t)
# return t
return spatial_pos_embed
def unpatchify(self, x, hw=None):
"""
x: (N, T, patch_size**2 * C)
imgs: (N, H, W, C)
"""
c = self.out_channels
p = self.x_embedder.patch_size[0]
if hw is None:
h = w = int(x.shape[1] ** 0.5)
else:
h, w = hw
h = (h + 1) // p
w = (w + 1) // p
assert h * w == x.shape[1]
x = x.reshape(shape=(x.shape[0], h, w, p, p, c))
x = torch.einsum("nhwpqc->nchpwq", x)
imgs = x.reshape(shape=(x.shape[0], c, h * p, w * p))
return imgs
def forward_core_with_concat(
self,
x: torch.Tensor,
c_mod: torch.Tensor,
context: Optional[torch.Tensor] = None,
control = None,
) -> torch.Tensor:
if self.register_length > 0:
context = torch.cat(
(
repeat(self.register, "1 ... -> b ...", b=x.shape[0]),
default(context, torch.Tensor([]).type_as(x)),
),
1,
)
# context is B, L', D
# x is B, L, D
blocks = len(self.joint_blocks)
for i in range(blocks):
context, x = self.joint_blocks[i](
context,
x,
c=c_mod,
use_checkpoint=self.use_checkpoint,
)
if control is not None:
control_o = control.get("output")
if i < len(control_o):
add = control_o[i]
if add is not None:
x += add
x = self.final_layer(x, c_mod) # (N, T, patch_size ** 2 * out_channels)
return x
def forward(
self,
x: torch.Tensor,
t: torch.Tensor,
y: Optional[torch.Tensor] = None,
context: Optional[torch.Tensor] = None,
control = None,
) -> torch.Tensor:
"""
Forward pass of DiT.
x: (N, C, H, W) tensor of spatial inputs (images or latent representations of images)
t: (N,) tensor of diffusion timesteps
y: (N,) tensor of class labels
"""
if self.context_processor is not None:
context = self.context_processor(context)
hw = x.shape[-2:]
x = self.x_embedder(x) + comfy.ops.cast_to_input(self.cropped_pos_embed(hw, device=x.device), x)
c = self.t_embedder(t, dtype=x.dtype) # (N, D)
if y is not None and self.y_embedder is not None:
y = self.y_embedder(y) # (N, D)
c = c + y # (N, D)
if context is not None:
context = self.context_embedder(context)
x = self.forward_core_with_concat(x, c, context, control)
x = self.unpatchify(x, hw=hw) # (N, out_channels, H, W)
return x[:,:,:hw[-2],:hw[-1]]
class OpenAISignatureMMDITWrapper(MMDiT):
def forward(
self,
x: torch.Tensor,
timesteps: torch.Tensor,
context: Optional[torch.Tensor] = None,
y: Optional[torch.Tensor] = None,
control = None,
**kwargs,
) -> torch.Tensor:
return super().forward(x, timesteps, context=context, y=y, control=control)

650
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# pytorch_diffusion + derived encoder decoder
import math
import torch
import torch.nn as nn
import numpy as np
from typing import Optional, Any
import logging
from comfy import model_management
import comfy.ops
ops = comfy.ops.disable_weight_init
if model_management.xformers_enabled_vae():
import xformers
import xformers.ops
def get_timestep_embedding(timesteps, embedding_dim):
"""
This matches the implementation in Denoising Diffusion Probabilistic Models:
From Fairseq.
Build sinusoidal embeddings.
This matches the implementation in tensor2tensor, but differs slightly
from the description in Section 3.5 of "Attention Is All You Need".
"""
assert len(timesteps.shape) == 1
half_dim = embedding_dim // 2
emb = math.log(10000) / (half_dim - 1)
emb = torch.exp(torch.arange(half_dim, dtype=torch.float32) * -emb)
emb = emb.to(device=timesteps.device)
emb = timesteps.float()[:, None] * emb[None, :]
emb = torch.cat([torch.sin(emb), torch.cos(emb)], dim=1)
if embedding_dim % 2 == 1: # zero pad
emb = torch.nn.functional.pad(emb, (0,1,0,0))
return emb
def nonlinearity(x):
# swish
return x*torch.sigmoid(x)
def Normalize(in_channels, num_groups=32):
return ops.GroupNorm(num_groups=num_groups, num_channels=in_channels, eps=1e-6, affine=True)
class Upsample(nn.Module):
def __init__(self, in_channels, with_conv):
super().__init__()
self.with_conv = with_conv
if self.with_conv:
self.conv = ops.Conv2d(in_channels,
in_channels,
kernel_size=3,
stride=1,
padding=1)
def forward(self, x):
try:
x = torch.nn.functional.interpolate(x, scale_factor=2.0, mode="nearest")
except: #operation not implemented for bf16
b, c, h, w = x.shape
out = torch.empty((b, c, h*2, w*2), dtype=x.dtype, layout=x.layout, device=x.device)
split = 8
l = out.shape[1] // split
for i in range(0, out.shape[1], l):
out[:,i:i+l] = torch.nn.functional.interpolate(x[:,i:i+l].to(torch.float32), scale_factor=2.0, mode="nearest").to(x.dtype)
del x
x = out
if self.with_conv:
x = self.conv(x)
return x
class Downsample(nn.Module):
def __init__(self, in_channels, with_conv):
super().__init__()
self.with_conv = with_conv
if self.with_conv:
# no asymmetric padding in torch conv, must do it ourselves
self.conv = ops.Conv2d(in_channels,
in_channels,
kernel_size=3,
stride=2,
padding=0)
def forward(self, x):
if self.with_conv:
pad = (0,1,0,1)
x = torch.nn.functional.pad(x, pad, mode="constant", value=0)
x = self.conv(x)
else:
x = torch.nn.functional.avg_pool2d(x, kernel_size=2, stride=2)
return x
class ResnetBlock(nn.Module):
def __init__(self, *, in_channels, out_channels=None, conv_shortcut=False,
dropout, temb_channels=512):
super().__init__()
self.in_channels = in_channels
out_channels = in_channels if out_channels is None else out_channels
self.out_channels = out_channels
self.use_conv_shortcut = conv_shortcut
self.swish = torch.nn.SiLU(inplace=True)
self.norm1 = Normalize(in_channels)
self.conv1 = ops.Conv2d(in_channels,
out_channels,
kernel_size=3,
stride=1,
padding=1)
if temb_channels > 0:
self.temb_proj = ops.Linear(temb_channels,
out_channels)
self.norm2 = Normalize(out_channels)
self.dropout = torch.nn.Dropout(dropout, inplace=True)
self.conv2 = ops.Conv2d(out_channels,
out_channels,
kernel_size=3,
stride=1,
padding=1)
if self.in_channels != self.out_channels:
if self.use_conv_shortcut:
self.conv_shortcut = ops.Conv2d(in_channels,
out_channels,
kernel_size=3,
stride=1,
padding=1)
else:
self.nin_shortcut = ops.Conv2d(in_channels,
out_channels,
kernel_size=1,
stride=1,
padding=0)
def forward(self, x, temb):
h = x
h = self.norm1(h)
h = self.swish(h)
h = self.conv1(h)
if temb is not None:
h = h + self.temb_proj(self.swish(temb))[:,:,None,None]
h = self.norm2(h)
h = self.swish(h)
h = self.dropout(h)
h = self.conv2(h)
if self.in_channels != self.out_channels:
if self.use_conv_shortcut:
x = self.conv_shortcut(x)
else:
x = self.nin_shortcut(x)
return x+h
def slice_attention(q, k, v):
r1 = torch.zeros_like(k, device=q.device)
scale = (int(q.shape[-1])**(-0.5))
mem_free_total = model_management.get_free_memory(q.device)
gb = 1024 ** 3
tensor_size = q.shape[0] * q.shape[1] * k.shape[2] * q.element_size()
modifier = 3 if q.element_size() == 2 else 2.5
mem_required = tensor_size * modifier
steps = 1
if mem_required > mem_free_total:
steps = 2**(math.ceil(math.log(mem_required / mem_free_total, 2)))
while True:
try:
slice_size = q.shape[1] // steps if (q.shape[1] % steps) == 0 else q.shape[1]
for i in range(0, q.shape[1], slice_size):
end = i + slice_size
s1 = torch.bmm(q[:, i:end], k) * scale
s2 = torch.nn.functional.softmax(s1, dim=2).permute(0,2,1)
del s1
r1[:, :, i:end] = torch.bmm(v, s2)
del s2
break
except model_management.OOM_EXCEPTION as e:
model_management.soft_empty_cache(True)
steps *= 2
if steps > 128:
raise e
logging.warning("out of memory error, increasing steps and trying again {}".format(steps))
return r1
def normal_attention(q, k, v):
# compute attention
b,c,h,w = q.shape
q = q.reshape(b,c,h*w)
q = q.permute(0,2,1) # b,hw,c
k = k.reshape(b,c,h*w) # b,c,hw
v = v.reshape(b,c,h*w)
r1 = slice_attention(q, k, v)
h_ = r1.reshape(b,c,h,w)
del r1
return h_
def xformers_attention(q, k, v):
# compute attention
B, C, H, W = q.shape
q, k, v = map(
lambda t: t.view(B, C, -1).transpose(1, 2).contiguous(),
(q, k, v),
)
try:
out = xformers.ops.memory_efficient_attention(q, k, v, attn_bias=None)
out = out.transpose(1, 2).reshape(B, C, H, W)
except NotImplementedError as e:
out = slice_attention(q.view(B, -1, C), k.view(B, -1, C).transpose(1, 2), v.view(B, -1, C).transpose(1, 2)).reshape(B, C, H, W)
return out
def pytorch_attention(q, k, v):
# compute attention
B, C, H, W = q.shape
q, k, v = map(
lambda t: t.view(B, 1, C, -1).transpose(2, 3).contiguous(),
(q, k, v),
)
try:
out = torch.nn.functional.scaled_dot_product_attention(q, k, v, attn_mask=None, dropout_p=0.0, is_causal=False)
out = out.transpose(2, 3).reshape(B, C, H, W)
except model_management.OOM_EXCEPTION as e:
logging.warning("scaled_dot_product_attention OOMed: switched to slice attention")
out = slice_attention(q.view(B, -1, C), k.view(B, -1, C).transpose(1, 2), v.view(B, -1, C).transpose(1, 2)).reshape(B, C, H, W)
return out
class AttnBlock(nn.Module):
def __init__(self, in_channels):
super().__init__()
self.in_channels = in_channels
self.norm = Normalize(in_channels)
self.q = ops.Conv2d(in_channels,
in_channels,
kernel_size=1,
stride=1,
padding=0)
self.k = ops.Conv2d(in_channels,
in_channels,
kernel_size=1,
stride=1,
padding=0)
self.v = ops.Conv2d(in_channels,
in_channels,
kernel_size=1,
stride=1,
padding=0)
self.proj_out = ops.Conv2d(in_channels,
in_channels,
kernel_size=1,
stride=1,
padding=0)
if model_management.xformers_enabled_vae():
logging.info("Using xformers attention in VAE")
self.optimized_attention = xformers_attention
elif model_management.pytorch_attention_enabled():
logging.info("Using pytorch attention in VAE")
self.optimized_attention = pytorch_attention
else:
logging.info("Using split attention in VAE")
self.optimized_attention = normal_attention
def forward(self, x):
h_ = x
h_ = self.norm(h_)
q = self.q(h_)
k = self.k(h_)
v = self.v(h_)
h_ = self.optimized_attention(q, k, v)
h_ = self.proj_out(h_)
return x+h_
def make_attn(in_channels, attn_type="vanilla", attn_kwargs=None):
return AttnBlock(in_channels)
class Model(nn.Module):
def __init__(self, *, ch, out_ch, ch_mult=(1,2,4,8), num_res_blocks,
attn_resolutions, dropout=0.0, resamp_with_conv=True, in_channels,
resolution, use_timestep=True, use_linear_attn=False, attn_type="vanilla"):
super().__init__()
if use_linear_attn: attn_type = "linear"
self.ch = ch
self.temb_ch = self.ch*4
self.num_resolutions = len(ch_mult)
self.num_res_blocks = num_res_blocks
self.resolution = resolution
self.in_channels = in_channels
self.use_timestep = use_timestep
if self.use_timestep:
# timestep embedding
self.temb = nn.Module()
self.temb.dense = nn.ModuleList([
ops.Linear(self.ch,
self.temb_ch),
ops.Linear(self.temb_ch,
self.temb_ch),
])
# downsampling
self.conv_in = ops.Conv2d(in_channels,
self.ch,
kernel_size=3,
stride=1,
padding=1)
curr_res = resolution
in_ch_mult = (1,)+tuple(ch_mult)
self.down = nn.ModuleList()
for i_level in range(self.num_resolutions):
block = nn.ModuleList()
attn = nn.ModuleList()
block_in = ch*in_ch_mult[i_level]
block_out = ch*ch_mult[i_level]
for i_block in range(self.num_res_blocks):
block.append(ResnetBlock(in_channels=block_in,
out_channels=block_out,
temb_channels=self.temb_ch,
dropout=dropout))
block_in = block_out
if curr_res in attn_resolutions:
attn.append(make_attn(block_in, attn_type=attn_type))
down = nn.Module()
down.block = block
down.attn = attn
if i_level != self.num_resolutions-1:
down.downsample = Downsample(block_in, resamp_with_conv)
curr_res = curr_res // 2
self.down.append(down)
# middle
self.mid = nn.Module()
self.mid.block_1 = ResnetBlock(in_channels=block_in,
out_channels=block_in,
temb_channels=self.temb_ch,
dropout=dropout)
self.mid.attn_1 = make_attn(block_in, attn_type=attn_type)
self.mid.block_2 = ResnetBlock(in_channels=block_in,
out_channels=block_in,
temb_channels=self.temb_ch,
dropout=dropout)
# upsampling
self.up = nn.ModuleList()
for i_level in reversed(range(self.num_resolutions)):
block = nn.ModuleList()
attn = nn.ModuleList()
block_out = ch*ch_mult[i_level]
skip_in = ch*ch_mult[i_level]
for i_block in range(self.num_res_blocks+1):
if i_block == self.num_res_blocks:
skip_in = ch*in_ch_mult[i_level]
block.append(ResnetBlock(in_channels=block_in+skip_in,
out_channels=block_out,
temb_channels=self.temb_ch,
dropout=dropout))
block_in = block_out
if curr_res in attn_resolutions:
attn.append(make_attn(block_in, attn_type=attn_type))
up = nn.Module()
up.block = block
up.attn = attn
if i_level != 0:
up.upsample = Upsample(block_in, resamp_with_conv)
curr_res = curr_res * 2
self.up.insert(0, up) # prepend to get consistent order
# end
self.norm_out = Normalize(block_in)
self.conv_out = ops.Conv2d(block_in,
out_ch,
kernel_size=3,
stride=1,
padding=1)
def forward(self, x, t=None, context=None):
#assert x.shape[2] == x.shape[3] == self.resolution
if context is not None:
# assume aligned context, cat along channel axis
x = torch.cat((x, context), dim=1)
if self.use_timestep:
# timestep embedding
assert t is not None
temb = get_timestep_embedding(t, self.ch)
temb = self.temb.dense[0](temb)
temb = nonlinearity(temb)
temb = self.temb.dense[1](temb)
else:
temb = None
# downsampling
hs = [self.conv_in(x)]
for i_level in range(self.num_resolutions):
for i_block in range(self.num_res_blocks):
h = self.down[i_level].block[i_block](hs[-1], temb)
if len(self.down[i_level].attn) > 0:
h = self.down[i_level].attn[i_block](h)
hs.append(h)
if i_level != self.num_resolutions-1:
hs.append(self.down[i_level].downsample(hs[-1]))
# middle
h = hs[-1]
h = self.mid.block_1(h, temb)
h = self.mid.attn_1(h)
h = self.mid.block_2(h, temb)
# upsampling
for i_level in reversed(range(self.num_resolutions)):
for i_block in range(self.num_res_blocks+1):
h = self.up[i_level].block[i_block](
torch.cat([h, hs.pop()], dim=1), temb)
if len(self.up[i_level].attn) > 0:
h = self.up[i_level].attn[i_block](h)
if i_level != 0:
h = self.up[i_level].upsample(h)
# end
h = self.norm_out(h)
h = nonlinearity(h)
h = self.conv_out(h)
return h
def get_last_layer(self):
return self.conv_out.weight
class Encoder(nn.Module):
def __init__(self, *, ch, out_ch, ch_mult=(1,2,4,8), num_res_blocks,
attn_resolutions, dropout=0.0, resamp_with_conv=True, in_channels,
resolution, z_channels, double_z=True, use_linear_attn=False, attn_type="vanilla",
**ignore_kwargs):
super().__init__()
if use_linear_attn: attn_type = "linear"
self.ch = ch
self.temb_ch = 0
self.num_resolutions = len(ch_mult)
self.num_res_blocks = num_res_blocks
self.resolution = resolution
self.in_channels = in_channels
# downsampling
self.conv_in = ops.Conv2d(in_channels,
self.ch,
kernel_size=3,
stride=1,
padding=1)
curr_res = resolution
in_ch_mult = (1,)+tuple(ch_mult)
self.in_ch_mult = in_ch_mult
self.down = nn.ModuleList()
for i_level in range(self.num_resolutions):
block = nn.ModuleList()
attn = nn.ModuleList()
block_in = ch*in_ch_mult[i_level]
block_out = ch*ch_mult[i_level]
for i_block in range(self.num_res_blocks):
block.append(ResnetBlock(in_channels=block_in,
out_channels=block_out,
temb_channels=self.temb_ch,
dropout=dropout))
block_in = block_out
if curr_res in attn_resolutions:
attn.append(make_attn(block_in, attn_type=attn_type))
down = nn.Module()
down.block = block
down.attn = attn
if i_level != self.num_resolutions-1:
down.downsample = Downsample(block_in, resamp_with_conv)
curr_res = curr_res // 2
self.down.append(down)
# middle
self.mid = nn.Module()
self.mid.block_1 = ResnetBlock(in_channels=block_in,
out_channels=block_in,
temb_channels=self.temb_ch,
dropout=dropout)
self.mid.attn_1 = make_attn(block_in, attn_type=attn_type)
self.mid.block_2 = ResnetBlock(in_channels=block_in,
out_channels=block_in,
temb_channels=self.temb_ch,
dropout=dropout)
# end
self.norm_out = Normalize(block_in)
self.conv_out = ops.Conv2d(block_in,
2*z_channels if double_z else z_channels,
kernel_size=3,
stride=1,
padding=1)
def forward(self, x):
# timestep embedding
temb = None
# downsampling
h = self.conv_in(x)
for i_level in range(self.num_resolutions):
for i_block in range(self.num_res_blocks):
h = self.down[i_level].block[i_block](h, temb)
if len(self.down[i_level].attn) > 0:
h = self.down[i_level].attn[i_block](h)
if i_level != self.num_resolutions-1:
h = self.down[i_level].downsample(h)
# middle
h = self.mid.block_1(h, temb)
h = self.mid.attn_1(h)
h = self.mid.block_2(h, temb)
# end
h = self.norm_out(h)
h = nonlinearity(h)
h = self.conv_out(h)
return h
class Decoder(nn.Module):
def __init__(self, *, ch, out_ch, ch_mult=(1,2,4,8), num_res_blocks,
attn_resolutions, dropout=0.0, resamp_with_conv=True, in_channels,
resolution, z_channels, give_pre_end=False, tanh_out=False, use_linear_attn=False,
conv_out_op=ops.Conv2d,
resnet_op=ResnetBlock,
attn_op=AttnBlock,
**ignorekwargs):
super().__init__()
if use_linear_attn: attn_type = "linear"
self.ch = ch
self.temb_ch = 0
self.num_resolutions = len(ch_mult)
self.num_res_blocks = num_res_blocks
self.resolution = resolution
self.in_channels = in_channels
self.give_pre_end = give_pre_end
self.tanh_out = tanh_out
# compute in_ch_mult, block_in and curr_res at lowest res
in_ch_mult = (1,)+tuple(ch_mult)
block_in = ch*ch_mult[self.num_resolutions-1]
curr_res = resolution // 2**(self.num_resolutions-1)
self.z_shape = (1,z_channels,curr_res,curr_res)
logging.debug("Working with z of shape {} = {} dimensions.".format(
self.z_shape, np.prod(self.z_shape)))
# z to block_in
self.conv_in = ops.Conv2d(z_channels,
block_in,
kernel_size=3,
stride=1,
padding=1)
# middle
self.mid = nn.Module()
self.mid.block_1 = resnet_op(in_channels=block_in,
out_channels=block_in,
temb_channels=self.temb_ch,
dropout=dropout)
self.mid.attn_1 = attn_op(block_in)
self.mid.block_2 = resnet_op(in_channels=block_in,
out_channels=block_in,
temb_channels=self.temb_ch,
dropout=dropout)
# upsampling
self.up = nn.ModuleList()
for i_level in reversed(range(self.num_resolutions)):
block = nn.ModuleList()
attn = nn.ModuleList()
block_out = ch*ch_mult[i_level]
for i_block in range(self.num_res_blocks+1):
block.append(resnet_op(in_channels=block_in,
out_channels=block_out,
temb_channels=self.temb_ch,
dropout=dropout))
block_in = block_out
if curr_res in attn_resolutions:
attn.append(attn_op(block_in))
up = nn.Module()
up.block = block
up.attn = attn
if i_level != 0:
up.upsample = Upsample(block_in, resamp_with_conv)
curr_res = curr_res * 2
self.up.insert(0, up) # prepend to get consistent order
# end
self.norm_out = Normalize(block_in)
self.conv_out = conv_out_op(block_in,
out_ch,
kernel_size=3,
stride=1,
padding=1)
def forward(self, z, **kwargs):
#assert z.shape[1:] == self.z_shape[1:]
self.last_z_shape = z.shape
# timestep embedding
temb = None
# z to block_in
h = self.conv_in(z)
# middle
h = self.mid.block_1(h, temb, **kwargs)
h = self.mid.attn_1(h, **kwargs)
h = self.mid.block_2(h, temb, **kwargs)
# upsampling
for i_level in reversed(range(self.num_resolutions)):
for i_block in range(self.num_res_blocks+1):
h = self.up[i_level].block[i_block](h, temb, **kwargs)
if len(self.up[i_level].attn) > 0:
h = self.up[i_level].attn[i_block](h, **kwargs)
if i_level != 0:
h = self.up[i_level].upsample(h)
# end
if self.give_pre_end:
return h
h = self.norm_out(h)
h = nonlinearity(h)
h = self.conv_out(h, **kwargs)
if self.tanh_out:
h = torch.tanh(h)
return h

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comfy/ldm/modules/diffusionmodules/openaimodel.py Normal file
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from abc import abstractmethod
import torch as th
import torch.nn as nn
import torch.nn.functional as F
from einops import rearrange
import logging
from .util import (
checkpoint,
avg_pool_nd,
zero_module,
timestep_embedding,
AlphaBlender,
)
from ..attention import SpatialTransformer, SpatialVideoTransformer, default
from comfy.ldm.util import exists
import comfy.ops
ops = comfy.ops.disable_weight_init
class TimestepBlock(nn.Module):
"""
Any module where forward() takes timestep embeddings as a second argument.
"""
@abstractmethod
def forward(self, x, emb):
"""
Apply the module to `x` given `emb` timestep embeddings.
"""
#This is needed because accelerate makes a copy of transformer_options which breaks "transformer_index"
def forward_timestep_embed(ts, x, emb, context=None, transformer_options={}, output_shape=None, time_context=None, num_video_frames=None, image_only_indicator=None):
for layer in ts:
if isinstance(layer, VideoResBlock):
x = layer(x, emb, num_video_frames, image_only_indicator)
elif isinstance(layer, TimestepBlock):
x = layer(x, emb)
elif isinstance(layer, SpatialVideoTransformer):
x = layer(x, context, time_context, num_video_frames, image_only_indicator, transformer_options)
if "transformer_index" in transformer_options:
transformer_options["transformer_index"] += 1
elif isinstance(layer, SpatialTransformer):
x = layer(x, context, transformer_options)
if "transformer_index" in transformer_options:
transformer_options["transformer_index"] += 1
elif isinstance(layer, Upsample):
x = layer(x, output_shape=output_shape)
else:
x = layer(x)
return x
class TimestepEmbedSequential(nn.Sequential, TimestepBlock):
"""
A sequential module that passes timestep embeddings to the children that
support it as an extra input.
"""
def forward(self, *args, **kwargs):
return forward_timestep_embed(self, *args, **kwargs)
class Upsample(nn.Module):
"""
An upsampling layer with an optional convolution.
:param channels: channels in the inputs and outputs.
:param use_conv: a bool determining if a convolution is applied.
:param dims: determines if the signal is 1D, 2D, or 3D. If 3D, then
upsampling occurs in the inner-two dimensions.
"""
def __init__(self, channels, use_conv, dims=2, out_channels=None, padding=1, dtype=None, device=None, operations=ops):
super().__init__()
self.channels = channels
self.out_channels = out_channels or channels
self.use_conv = use_conv
self.dims = dims
if use_conv:
self.conv = operations.conv_nd(dims, self.channels, self.out_channels, 3, padding=padding, dtype=dtype, device=device)
def forward(self, x, output_shape=None):
assert x.shape[1] == self.channels
if self.dims == 3:
shape = [x.shape[2], x.shape[3] * 2, x.shape[4] * 2]
if output_shape is not None:
shape[1] = output_shape[3]
shape[2] = output_shape[4]
else:
shape = [x.shape[2] * 2, x.shape[3] * 2]
if output_shape is not None:
shape[0] = output_shape[2]
shape[1] = output_shape[3]
x = F.interpolate(x, size=shape, mode="nearest")
if self.use_conv:
x = self.conv(x)
return x
class Downsample(nn.Module):
"""
A downsampling layer with an optional convolution.
:param channels: channels in the inputs and outputs.
:param use_conv: a bool determining if a convolution is applied.
:param dims: determines if the signal is 1D, 2D, or 3D. If 3D, then
downsampling occurs in the inner-two dimensions.
"""
def __init__(self, channels, use_conv, dims=2, out_channels=None, padding=1, dtype=None, device=None, operations=ops):
super().__init__()
self.channels = channels
self.out_channels = out_channels or channels
self.use_conv = use_conv
self.dims = dims
stride = 2 if dims != 3 else (1, 2, 2)
if use_conv:
self.op = operations.conv_nd(
dims, self.channels, self.out_channels, 3, stride=stride, padding=padding, dtype=dtype, device=device
)
else:
assert self.channels == self.out_channels
self.op = avg_pool_nd(dims, kernel_size=stride, stride=stride)
def forward(self, x):
assert x.shape[1] == self.channels
return self.op(x)
class ResBlock(TimestepBlock):
"""
A residual block that can optionally change the number of channels.
:param channels: the number of input channels.
:param emb_channels: the number of timestep embedding channels.
:param dropout: the rate of dropout.
:param out_channels: if specified, the number of out channels.
:param use_conv: if True and out_channels is specified, use a spatial
convolution instead of a smaller 1x1 convolution to change the
channels in the skip connection.
:param dims: determines if the signal is 1D, 2D, or 3D.
:param use_checkpoint: if True, use gradient checkpointing on this module.
:param up: if True, use this block for upsampling.
:param down: if True, use this block for downsampling.
"""
def __init__(
self,
channels,
emb_channels,
dropout,
out_channels=None,
use_conv=False,
use_scale_shift_norm=False,
dims=2,
use_checkpoint=False,
up=False,
down=False,
kernel_size=3,
exchange_temb_dims=False,
skip_t_emb=False,
dtype=None,
device=None,
operations=ops
):
super().__init__()
self.channels = channels
self.emb_channels = emb_channels
self.dropout = dropout
self.out_channels = out_channels or channels
self.use_conv = use_conv
self.use_checkpoint = use_checkpoint
self.use_scale_shift_norm = use_scale_shift_norm
self.exchange_temb_dims = exchange_temb_dims
if isinstance(kernel_size, list):
padding = [k // 2 for k in kernel_size]
else:
padding = kernel_size // 2
self.in_layers = nn.Sequential(
operations.GroupNorm(32, channels, dtype=dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, channels, self.out_channels, kernel_size, padding=padding, dtype=dtype, device=device),
)
self.updown = up or down
if up:
self.h_upd = Upsample(channels, False, dims, dtype=dtype, device=device)
self.x_upd = Upsample(channels, False, dims, dtype=dtype, device=device)
elif down:
self.h_upd = Downsample(channels, False, dims, dtype=dtype, device=device)
self.x_upd = Downsample(channels, False, dims, dtype=dtype, device=device)
else:
self.h_upd = self.x_upd = nn.Identity()
self.skip_t_emb = skip_t_emb
if self.skip_t_emb:
self.emb_layers = None
self.exchange_temb_dims = False
else:
self.emb_layers = nn.Sequential(
nn.SiLU(),
operations.Linear(
emb_channels,
2 * self.out_channels if use_scale_shift_norm else self.out_channels, dtype=dtype, device=device
),
)
self.out_layers = nn.Sequential(
operations.GroupNorm(32, self.out_channels, dtype=dtype, device=device),
nn.SiLU(),
nn.Dropout(p=dropout),
operations.conv_nd(dims, self.out_channels, self.out_channels, kernel_size, padding=padding, dtype=dtype, device=device)
,
)
if self.out_channels == channels:
self.skip_connection = nn.Identity()
elif use_conv:
self.skip_connection = operations.conv_nd(
dims, channels, self.out_channels, kernel_size, padding=padding, dtype=dtype, device=device
)
else:
self.skip_connection = operations.conv_nd(dims, channels, self.out_channels, 1, dtype=dtype, device=device)
def forward(self, x, emb):
"""
Apply the block to a Tensor, conditioned on a timestep embedding.
:param x: an [N x C x ...] Tensor of features.
:param emb: an [N x emb_channels] Tensor of timestep embeddings.
:return: an [N x C x ...] Tensor of outputs.
"""
return checkpoint(
self._forward, (x, emb), self.parameters(), self.use_checkpoint
)
def _forward(self, x, emb):
if self.updown:
in_rest, in_conv = self.in_layers[:-1], self.in_layers[-1]
h = in_rest(x)
h = self.h_upd(h)
x = self.x_upd(x)
h = in_conv(h)
else:
h = self.in_layers(x)
emb_out = None
if not self.skip_t_emb:
emb_out = self.emb_layers(emb).type(h.dtype)
while len(emb_out.shape) < len(h.shape):
emb_out = emb_out[..., None]
if self.use_scale_shift_norm:
out_norm, out_rest = self.out_layers[0], self.out_layers[1:]
h = out_norm(h)
if emb_out is not None:
scale, shift = th.chunk(emb_out, 2, dim=1)
h *= (1 + scale)
h += shift
h = out_rest(h)
else:
if emb_out is not None:
if self.exchange_temb_dims:
emb_out = emb_out.movedim(1, 2)
h = h + emb_out
h = self.out_layers(h)
return self.skip_connection(x) + h
class VideoResBlock(ResBlock):
def __init__(
self,
channels: int,
emb_channels: int,
dropout: float,
video_kernel_size=3,
merge_strategy: str = "fixed",
merge_factor: float = 0.5,
out_channels=None,
use_conv: bool = False,
use_scale_shift_norm: bool = False,
dims: int = 2,
use_checkpoint: bool = False,
up: bool = False,
down: bool = False,
dtype=None,
device=None,
operations=ops
):
super().__init__(
channels,
emb_channels,
dropout,
out_channels=out_channels,
use_conv=use_conv,
use_scale_shift_norm=use_scale_shift_norm,
dims=dims,
use_checkpoint=use_checkpoint,
up=up,
down=down,
dtype=dtype,
device=device,
operations=operations
)
self.time_stack = ResBlock(
default(out_channels, channels),
emb_channels,
dropout=dropout,
dims=3,
out_channels=default(out_channels, channels),
use_scale_shift_norm=False,
use_conv=False,
up=False,
down=False,
kernel_size=video_kernel_size,
use_checkpoint=use_checkpoint,
exchange_temb_dims=True,
dtype=dtype,
device=device,
operations=operations
)
self.time_mixer = AlphaBlender(
alpha=merge_factor,
merge_strategy=merge_strategy,
rearrange_pattern="b t -> b 1 t 1 1",
)
def forward(
self,
x: th.Tensor,
emb: th.Tensor,
num_video_frames: int,
image_only_indicator = None,
) -> th.Tensor:
x = super().forward(x, emb)
x_mix = rearrange(x, "(b t) c h w -> b c t h w", t=num_video_frames)
x = rearrange(x, "(b t) c h w -> b c t h w", t=num_video_frames)
x = self.time_stack(
x, rearrange(emb, "(b t) ... -> b t ...", t=num_video_frames)
)
x = self.time_mixer(
x_spatial=x_mix, x_temporal=x, image_only_indicator=image_only_indicator
)
x = rearrange(x, "b c t h w -> (b t) c h w")
return x
class Timestep(nn.Module):
def __init__(self, dim):
super().__init__()
self.dim = dim
def forward(self, t):
return timestep_embedding(t, self.dim)
def apply_control(h, control, name):
if control is not None and name in control and len(control[name]) > 0:
ctrl = control[name].pop()
if ctrl is not None:
try:
h += ctrl
except:
logging.warning("warning control could not be applied {} {}".format(h.shape, ctrl.shape))
return h
class UNetModel(nn.Module):
"""
The full UNet model with attention and timestep embedding.
:param in_channels: channels in the input Tensor.
:param model_channels: base channel count for the model.
:param out_channels: channels in the output Tensor.
:param num_res_blocks: number of residual blocks per downsample.
:param dropout: the dropout probability.
:param channel_mult: channel multiplier for each level of the UNet.
:param conv_resample: if True, use learned convolutions for upsampling and
downsampling.
:param dims: determines if the signal is 1D, 2D, or 3D.
:param num_classes: if specified (as an int), then this model will be
class-conditional with `num_classes` classes.
:param use_checkpoint: use gradient checkpointing to reduce memory usage.
:param num_heads: the number of attention heads in each attention layer.
:param num_heads_channels: if specified, ignore num_heads and instead use
a fixed channel width per attention head.
:param num_heads_upsample: works with num_heads to set a different number
of heads for upsampling. Deprecated.
:param use_scale_shift_norm: use a FiLM-like conditioning mechanism.
:param resblock_updown: use residual blocks for up/downsampling.
:param use_new_attention_order: use a different attention pattern for potentially
increased efficiency.
"""
def __init__(
self,
image_size,
in_channels,
model_channels,
out_channels,
num_res_blocks,
dropout=0,
channel_mult=(1, 2, 4, 8),
conv_resample=True,
dims=2,
num_classes=None,
use_checkpoint=False,
dtype=th.float32,
num_heads=-1,
num_head_channels=-1,
num_heads_upsample=-1,
use_scale_shift_norm=False,
resblock_updown=False,
use_new_attention_order=False,
use_spatial_transformer=False, # custom transformer support
transformer_depth=1, # custom transformer support
context_dim=None, # custom transformer support
n_embed=None, # custom support for prediction of discrete ids into codebook of first stage vq model
legacy=True,
disable_self_attentions=None,
num_attention_blocks=None,
disable_middle_self_attn=False,
use_linear_in_transformer=False,
adm_in_channels=None,
transformer_depth_middle=None,
transformer_depth_output=None,
use_temporal_resblock=False,
use_temporal_attention=False,
time_context_dim=None,
extra_ff_mix_layer=False,
use_spatial_context=False,
merge_strategy=None,
merge_factor=0.0,
video_kernel_size=None,
disable_temporal_crossattention=False,
max_ddpm_temb_period=10000,
attn_precision=None,
device=None,
operations=ops,
):
super().__init__()
if context_dim is not None:
assert use_spatial_transformer, 'Fool!! You forgot to use the spatial transformer for your cross-attention conditioning...'
# from omegaconf.listconfig import ListConfig
# if type(context_dim) == ListConfig:
# context_dim = list(context_dim)
if num_heads_upsample == -1:
num_heads_upsample = num_heads
if num_heads == -1:
assert num_head_channels != -1, 'Either num_heads or num_head_channels has to be set'
if num_head_channels == -1:
assert num_heads != -1, 'Either num_heads or num_head_channels has to be set'
self.in_channels = in_channels
self.model_channels = model_channels
self.out_channels = out_channels
if isinstance(num_res_blocks, int):
self.num_res_blocks = len(channel_mult) * [num_res_blocks]
else:
if len(num_res_blocks) != len(channel_mult):
raise ValueError("provide num_res_blocks either as an int (globally constant) or "
"as a list/tuple (per-level) with the same length as channel_mult")
self.num_res_blocks = num_res_blocks
if disable_self_attentions is not None:
# should be a list of booleans, indicating whether to disable self-attention in TransformerBlocks or not
assert len(disable_self_attentions) == len(channel_mult)
if num_attention_blocks is not None:
assert len(num_attention_blocks) == len(self.num_res_blocks)
transformer_depth = transformer_depth[:]
transformer_depth_output = transformer_depth_output[:]
self.dropout = dropout
self.channel_mult = channel_mult
self.conv_resample = conv_resample
self.num_classes = num_classes
self.use_checkpoint = use_checkpoint
self.dtype = dtype
self.num_heads = num_heads
self.num_head_channels = num_head_channels
self.num_heads_upsample = num_heads_upsample
self.use_temporal_resblocks = use_temporal_resblock
self.predict_codebook_ids = n_embed is not None
self.default_num_video_frames = None
time_embed_dim = model_channels * 4
self.time_embed = nn.Sequential(
operations.Linear(model_channels, time_embed_dim, dtype=self.dtype, device=device),
nn.SiLU(),
operations.Linear(time_embed_dim, time_embed_dim, dtype=self.dtype, device=device),
)
if self.num_classes is not None:
if isinstance(self.num_classes, int):
self.label_emb = nn.Embedding(num_classes, time_embed_dim, dtype=self.dtype, device=device)
elif self.num_classes == "continuous":
logging.debug("setting up linear c_adm embedding layer")
self.label_emb = nn.Linear(1, time_embed_dim)
elif self.num_classes == "sequential":
assert adm_in_channels is not None
self.label_emb = nn.Sequential(
nn.Sequential(
operations.Linear(adm_in_channels, time_embed_dim, dtype=self.dtype, device=device),
nn.SiLU(),
operations.Linear(time_embed_dim, time_embed_dim, dtype=self.dtype, device=device),
)
)
else:
raise ValueError()
self.input_blocks = nn.ModuleList(
[
TimestepEmbedSequential(
operations.conv_nd(dims, in_channels, model_channels, 3, padding=1, dtype=self.dtype, device=device)
)
]
)
self._feature_size = model_channels
input_block_chans = [model_channels]
ch = model_channels
ds = 1
def get_attention_layer(
ch,
num_heads,
dim_head,
depth=1,
context_dim=None,
use_checkpoint=False,
disable_self_attn=False,
):
if use_temporal_attention:
return SpatialVideoTransformer(
ch,
num_heads,
dim_head,
depth=depth,
context_dim=context_dim,
time_context_dim=time_context_dim,
dropout=dropout,
ff_in=extra_ff_mix_layer,
use_spatial_context=use_spatial_context,
merge_strategy=merge_strategy,
merge_factor=merge_factor,
checkpoint=use_checkpoint,
use_linear=use_linear_in_transformer,
disable_self_attn=disable_self_attn,
disable_temporal_crossattention=disable_temporal_crossattention,
max_time_embed_period=max_ddpm_temb_period,
attn_precision=attn_precision,
dtype=self.dtype, device=device, operations=operations
)
else:
return SpatialTransformer(
ch, num_heads, dim_head, depth=depth, context_dim=context_dim,
disable_self_attn=disable_self_attn, use_linear=use_linear_in_transformer,
use_checkpoint=use_checkpoint, attn_precision=attn_precision, dtype=self.dtype, device=device, operations=operations
)
def get_resblock(
merge_factor,
merge_strategy,
video_kernel_size,
ch,
time_embed_dim,
dropout,
out_channels,
dims,
use_checkpoint,
use_scale_shift_norm,
down=False,
up=False,
dtype=None,
device=None,
operations=ops
):
if self.use_temporal_resblocks:
return VideoResBlock(
merge_factor=merge_factor,
merge_strategy=merge_strategy,
video_kernel_size=video_kernel_size,
channels=ch,
emb_channels=time_embed_dim,
dropout=dropout,
out_channels=out_channels,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
down=down,
up=up,
dtype=dtype,
device=device,
operations=operations
)
else:
return ResBlock(
channels=ch,
emb_channels=time_embed_dim,
dropout=dropout,
out_channels=out_channels,
use_checkpoint=use_checkpoint,
dims=dims,
use_scale_shift_norm=use_scale_shift_norm,
down=down,
up=up,
dtype=dtype,
device=device,
operations=operations
)
for level, mult in enumerate(channel_mult):
for nr in range(self.num_res_blocks[level]):
layers = [
get_resblock(
merge_factor=merge_factor,
merge_strategy=merge_strategy,
video_kernel_size=video_kernel_size,
ch=ch,
time_embed_dim=time_embed_dim,
dropout=dropout,
out_channels=mult * model_channels,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
dtype=self.dtype,
device=device,
operations=operations,
)
]
ch = mult * model_channels
num_transformers = transformer_depth.pop(0)
if num_transformers > 0:
if num_head_channels == -1:
dim_head = ch // num_heads
else:
num_heads = ch // num_head_channels
dim_head = num_head_channels
if legacy:
#num_heads = 1
dim_head = ch // num_heads if use_spatial_transformer else num_head_channels
if exists(disable_self_attentions):
disabled_sa = disable_self_attentions[level]
else:
disabled_sa = False
if not exists(num_attention_blocks) or nr < num_attention_blocks[level]:
layers.append(get_attention_layer(
ch, num_heads, dim_head, depth=num_transformers, context_dim=context_dim,
disable_self_attn=disabled_sa, use_checkpoint=use_checkpoint)
)
self.input_blocks.append(TimestepEmbedSequential(*layers))
self._feature_size += ch
input_block_chans.append(ch)
if level != len(channel_mult) - 1:
out_ch = ch
self.input_blocks.append(
TimestepEmbedSequential(
get_resblock(
merge_factor=merge_factor,
merge_strategy=merge_strategy,
video_kernel_size=video_kernel_size,
ch=ch,
time_embed_dim=time_embed_dim,
dropout=dropout,
out_channels=out_ch,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
down=True,
dtype=self.dtype,
device=device,
operations=operations
)
if resblock_updown
else Downsample(
ch, conv_resample, dims=dims, out_channels=out_ch, dtype=self.dtype, device=device, operations=operations
)
)
)
ch = out_ch
input_block_chans.append(ch)
ds *= 2
self._feature_size += ch
if num_head_channels == -1:
dim_head = ch // num_heads
else:
num_heads = ch // num_head_channels
dim_head = num_head_channels
if legacy:
#num_heads = 1
dim_head = ch // num_heads if use_spatial_transformer else num_head_channels
mid_block = [
get_resblock(
merge_factor=merge_factor,
merge_strategy=merge_strategy,
video_kernel_size=video_kernel_size,
ch=ch,
time_embed_dim=time_embed_dim,
dropout=dropout,
out_channels=None,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
dtype=self.dtype,
device=device,
operations=operations
)]
self.middle_block = None
if transformer_depth_middle >= -1:
if transformer_depth_middle >= 0:
mid_block += [get_attention_layer( # always uses a self-attn
ch, num_heads, dim_head, depth=transformer_depth_middle, context_dim=context_dim,
disable_self_attn=disable_middle_self_attn, use_checkpoint=use_checkpoint
),
get_resblock(
merge_factor=merge_factor,
merge_strategy=merge_strategy,
video_kernel_size=video_kernel_size,
ch=ch,
time_embed_dim=time_embed_dim,
dropout=dropout,
out_channels=None,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
dtype=self.dtype,
device=device,
operations=operations
)]
self.middle_block = TimestepEmbedSequential(*mid_block)
self._feature_size += ch
self.output_blocks = nn.ModuleList([])
for level, mult in list(enumerate(channel_mult))[::-1]:
for i in range(self.num_res_blocks[level] + 1):
ich = input_block_chans.pop()
layers = [
get_resblock(
merge_factor=merge_factor,
merge_strategy=merge_strategy,
video_kernel_size=video_kernel_size,
ch=ch + ich,
time_embed_dim=time_embed_dim,
dropout=dropout,
out_channels=model_channels * mult,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
dtype=self.dtype,
device=device,
operations=operations
)
]
ch = model_channels * mult
num_transformers = transformer_depth_output.pop()
if num_transformers > 0:
if num_head_channels == -1:
dim_head = ch // num_heads
else:
num_heads = ch // num_head_channels
dim_head = num_head_channels
if legacy:
#num_heads = 1
dim_head = ch // num_heads if use_spatial_transformer else num_head_channels
if exists(disable_self_attentions):
disabled_sa = disable_self_attentions[level]
else:
disabled_sa = False
if not exists(num_attention_blocks) or i < num_attention_blocks[level]:
layers.append(
get_attention_layer(
ch, num_heads, dim_head, depth=num_transformers, context_dim=context_dim,
disable_self_attn=disabled_sa, use_checkpoint=use_checkpoint
)
)
if level and i == self.num_res_blocks[level]:
out_ch = ch
layers.append(
get_resblock(
merge_factor=merge_factor,
merge_strategy=merge_strategy,
video_kernel_size=video_kernel_size,
ch=ch,
time_embed_dim=time_embed_dim,
dropout=dropout,
out_channels=out_ch,
dims=dims,
use_checkpoint=use_checkpoint,
use_scale_shift_norm=use_scale_shift_norm,
up=True,
dtype=self.dtype,
device=device,
operations=operations
)
if resblock_updown
else Upsample(ch, conv_resample, dims=dims, out_channels=out_ch, dtype=self.dtype, device=device, operations=operations)
)
ds //= 2
self.output_blocks.append(TimestepEmbedSequential(*layers))
self._feature_size += ch
self.out = nn.Sequential(
operations.GroupNorm(32, ch, dtype=self.dtype, device=device),
nn.SiLU(),
operations.conv_nd(dims, model_channels, out_channels, 3, padding=1, dtype=self.dtype, device=device),
)
if self.predict_codebook_ids:
self.id_predictor = nn.Sequential(
operations.GroupNorm(32, ch, dtype=self.dtype, device=device),
operations.conv_nd(dims, model_channels, n_embed, 1, dtype=self.dtype, device=device),
#nn.LogSoftmax(dim=1) # change to cross_entropy and produce non-normalized logits
)
def forward(self, x, timesteps=None, context=None, y=None, control=None, transformer_options={}, **kwargs):
"""
Apply the model to an input batch.
:param x: an [N x C x ...] Tensor of inputs.
:param timesteps: a 1-D batch of timesteps.
:param context: conditioning plugged in via crossattn
:param y: an [N] Tensor of labels, if class-conditional.
:return: an [N x C x ...] Tensor of outputs.
"""
transformer_options["original_shape"] = list(x.shape)
transformer_options["transformer_index"] = 0
transformer_patches = transformer_options.get("patches", {})
num_video_frames = kwargs.get("num_video_frames", self.default_num_video_frames)
image_only_indicator = kwargs.get("image_only_indicator", None)
time_context = kwargs.get("time_context", None)
assert (y is not None) == (
self.num_classes is not None
), "must specify y if and only if the model is class-conditional"
hs = []
t_emb = timestep_embedding(timesteps, self.model_channels, repeat_only=False).to(x.dtype)
emb = self.time_embed(t_emb)
if self.num_classes is not None:
assert y.shape[0] == x.shape[0]
emb = emb + self.label_emb(y)
h = x
for id, module in enumerate(self.input_blocks):
transformer_options["block"] = ("input", id)
h = forward_timestep_embed(module, h, emb, context, transformer_options, time_context=time_context, num_video_frames=num_video_frames, image_only_indicator=image_only_indicator)
h = apply_control(h, control, 'input')
if "input_block_patch" in transformer_patches:
patch = transformer_patches["input_block_patch"]
for p in patch:
h = p(h, transformer_options)
hs.append(h)
if "input_block_patch_after_skip" in transformer_patches:
patch = transformer_patches["input_block_patch_after_skip"]
for p in patch:
h = p(h, transformer_options)
transformer_options["block"] = ("middle", 0)
if self.middle_block is not None:
h = forward_timestep_embed(self.middle_block, h, emb, context, transformer_options, time_context=time_context, num_video_frames=num_video_frames, image_only_indicator=image_only_indicator)
h = apply_control(h, control, 'middle')
for id, module in enumerate(self.output_blocks):
transformer_options["block"] = ("output", id)
hsp = hs.pop()
hsp = apply_control(hsp, control, 'output')
if "output_block_patch" in transformer_patches:
patch = transformer_patches["output_block_patch"]
for p in patch:
h, hsp = p(h, hsp, transformer_options)
h = th.cat([h, hsp], dim=1)
del hsp
if len(hs) > 0:
output_shape = hs[-1].shape
else:
output_shape = None
h = forward_timestep_embed(module, h, emb, context, transformer_options, output_shape, time_context=time_context, num_video_frames=num_video_frames, image_only_indicator=image_only_indicator)
h = h.type(x.dtype)
if self.predict_codebook_ids:
return self.id_predictor(h)
else:
return self.out(h)

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comfy/ldm/modules/diffusionmodules/upscaling.py Normal file
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import torch
import torch.nn as nn
import numpy as np
from functools import partial
from .util import extract_into_tensor, make_beta_schedule
from comfy.ldm.util import default
class AbstractLowScaleModel(nn.Module):
# for concatenating a downsampled image to the latent representation
def __init__(self, noise_schedule_config=None):
super(AbstractLowScaleModel, self).__init__()
if noise_schedule_config is not None:
self.register_schedule(**noise_schedule_config)
def register_schedule(self, beta_schedule="linear", timesteps=1000,
linear_start=1e-4, linear_end=2e-2, cosine_s=8e-3):
betas = make_beta_schedule(beta_schedule, timesteps, linear_start=linear_start, linear_end=linear_end,
cosine_s=cosine_s)
alphas = 1. - betas
alphas_cumprod = np.cumprod(alphas, axis=0)
alphas_cumprod_prev = np.append(1., alphas_cumprod[:-1])
timesteps, = betas.shape
self.num_timesteps = int(timesteps)
self.linear_start = linear_start
self.linear_end = linear_end
assert alphas_cumprod.shape[0] == self.num_timesteps, 'alphas have to be defined for each timestep'
to_torch = partial(torch.tensor, dtype=torch.float32)
self.register_buffer('betas', to_torch(betas))
self.register_buffer('alphas_cumprod', to_torch(alphas_cumprod))
self.register_buffer('alphas_cumprod_prev', to_torch(alphas_cumprod_prev))
# calculations for diffusion q(x_t | x_{t-1}) and others
self.register_buffer('sqrt_alphas_cumprod', to_torch(np.sqrt(alphas_cumprod)))
self.register_buffer('sqrt_one_minus_alphas_cumprod', to_torch(np.sqrt(1. - alphas_cumprod)))
self.register_buffer('log_one_minus_alphas_cumprod', to_torch(np.log(1. - alphas_cumprod)))
self.register_buffer('sqrt_recip_alphas_cumprod', to_torch(np.sqrt(1. / alphas_cumprod)))
self.register_buffer('sqrt_recipm1_alphas_cumprod', to_torch(np.sqrt(1. / alphas_cumprod - 1)))
def q_sample(self, x_start, t, noise=None, seed=None):
if noise is None:
if seed is None:
noise = torch.randn_like(x_start)
else:
noise = torch.randn(x_start.size(), dtype=x_start.dtype, layout=x_start.layout, generator=torch.manual_seed(seed)).to(x_start.device)
return (extract_into_tensor(self.sqrt_alphas_cumprod.to(x_start.device), t, x_start.shape) * x_start +
extract_into_tensor(self.sqrt_one_minus_alphas_cumprod.to(x_start.device), t, x_start.shape) * noise)
def forward(self, x):
return x, None
def decode(self, x):
return x
class SimpleImageConcat(AbstractLowScaleModel):
# no noise level conditioning
def __init__(self):
super(SimpleImageConcat, self).__init__(noise_schedule_config=None)
self.max_noise_level = 0
def forward(self, x):
# fix to constant noise level
return x, torch.zeros(x.shape[0], device=x.device).long()
class ImageConcatWithNoiseAugmentation(AbstractLowScaleModel):
def __init__(self, noise_schedule_config, max_noise_level=1000, to_cuda=False):
super().__init__(noise_schedule_config=noise_schedule_config)
self.max_noise_level = max_noise_level
def forward(self, x, noise_level=None, seed=None):
if noise_level is None:
noise_level = torch.randint(0, self.max_noise_level, (x.shape[0],), device=x.device).long()
else:
assert isinstance(noise_level, torch.Tensor)
z = self.q_sample(x, noise_level, seed=seed)
return z, noise_level

306
comfy/ldm/modules/diffusionmodules/util.py Normal file
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# adopted from
# https://github.com/openai/improved-diffusion/blob/main/improved_diffusion/gaussian_diffusion.py
# and
# https://github.com/lucidrains/denoising-diffusion-pytorch/blob/7706bdfc6f527f58d33f84b7b522e61e6e3164b3/denoising_diffusion_pytorch/denoising_diffusion_pytorch.py
# and
# https://github.com/openai/guided-diffusion/blob/0ba878e517b276c45d1195eb29f6f5f72659a05b/guided_diffusion/nn.py
#
# thanks!
import os
import math
import torch
import torch.nn as nn
import numpy as np
from einops import repeat, rearrange
from comfy.ldm.util import instantiate_from_config
class AlphaBlender(nn.Module):
strategies = ["learned", "fixed", "learned_with_images"]
def __init__(
self,
alpha: float,
merge_strategy: str = "learned_with_images",
rearrange_pattern: str = "b t -> (b t) 1 1",
):
super().__init__()
self.merge_strategy = merge_strategy
self.rearrange_pattern = rearrange_pattern
assert (
merge_strategy in self.strategies
), f"merge_strategy needs to be in {self.strategies}"
if self.merge_strategy == "fixed":
self.register_buffer("mix_factor", torch.Tensor([alpha]))
elif (
self.merge_strategy == "learned"
or self.merge_strategy == "learned_with_images"
):
self.register_parameter(
"mix_factor", torch.nn.Parameter(torch.Tensor([alpha]))
)
else:
raise ValueError(f"unknown merge strategy {self.merge_strategy}")
def get_alpha(self, image_only_indicator: torch.Tensor, device) -> torch.Tensor:
# skip_time_mix = rearrange(repeat(skip_time_mix, 'b -> (b t) () () ()', t=t), '(b t) 1 ... -> b 1 t ...', t=t)
if self.merge_strategy == "fixed":
# make shape compatible
# alpha = repeat(self.mix_factor, '1 -> b () t () ()', t=t, b=bs)
alpha = self.mix_factor.to(device)
elif self.merge_strategy == "learned":
alpha = torch.sigmoid(self.mix_factor.to(device))
# make shape compatible
# alpha = repeat(alpha, '1 -> s () ()', s = t * bs)
elif self.merge_strategy == "learned_with_images":
if image_only_indicator is None:
alpha = rearrange(torch.sigmoid(self.mix_factor.to(device)), "... -> ... 1")
else:
alpha = torch.where(
image_only_indicator.bool(),
torch.ones(1, 1, device=image_only_indicator.device),
rearrange(torch.sigmoid(self.mix_factor.to(image_only_indicator.device)), "... -> ... 1"),
)
alpha = rearrange(alpha, self.rearrange_pattern)
# make shape compatible
# alpha = repeat(alpha, '1 -> s () ()', s = t * bs)
else:
raise NotImplementedError()
return alpha
def forward(
self,
x_spatial,
x_temporal,
image_only_indicator=None,
) -> torch.Tensor:
alpha = self.get_alpha(image_only_indicator, x_spatial.device)
x = (
alpha.to(x_spatial.dtype) * x_spatial
+ (1.0 - alpha).to(x_spatial.dtype) * x_temporal
)
return x
def make_beta_schedule(schedule, n_timestep, linear_start=1e-4, linear_end=2e-2, cosine_s=8e-3):
if schedule == "linear":
betas = (
torch.linspace(linear_start ** 0.5, linear_end ** 0.5, n_timestep, dtype=torch.float64) ** 2
)
elif schedule == "cosine":
timesteps = (
torch.arange(n_timestep + 1, dtype=torch.float64) / n_timestep + cosine_s
)
alphas = timesteps / (1 + cosine_s) * np.pi / 2
alphas = torch.cos(alphas).pow(2)
alphas = alphas / alphas[0]
betas = 1 - alphas[1:] / alphas[:-1]
betas = torch.clamp(betas, min=0, max=0.999)
elif schedule == "squaredcos_cap_v2": # used for karlo prior
# return early
return betas_for_alpha_bar(
n_timestep,
lambda t: math.cos((t + 0.008) / 1.008 * math.pi / 2) ** 2,
)
elif schedule == "sqrt_linear":
betas = torch.linspace(linear_start, linear_end, n_timestep, dtype=torch.float64)
elif schedule == "sqrt":
betas = torch.linspace(linear_start, linear_end, n_timestep, dtype=torch.float64) ** 0.5
else:
raise ValueError(f"schedule '{schedule}' unknown.")
return betas
def make_ddim_timesteps(ddim_discr_method, num_ddim_timesteps, num_ddpm_timesteps, verbose=True):
if ddim_discr_method == 'uniform':
c = num_ddpm_timesteps // num_ddim_timesteps
ddim_timesteps = np.asarray(list(range(0, num_ddpm_timesteps, c)))
elif ddim_discr_method == 'quad':
ddim_timesteps = ((np.linspace(0, np.sqrt(num_ddpm_timesteps * .8), num_ddim_timesteps)) ** 2).astype(int)
else:
raise NotImplementedError(f'There is no ddim discretization method called "{ddim_discr_method}"')
# assert ddim_timesteps.shape[0] == num_ddim_timesteps
# add one to get the final alpha values right (the ones from first scale to data during sampling)
steps_out = ddim_timesteps + 1
if verbose:
print(f'Selected timesteps for ddim sampler: {steps_out}')
return steps_out
def make_ddim_sampling_parameters(alphacums, ddim_timesteps, eta, verbose=True):
# select alphas for computing the variance schedule
alphas = alphacums[ddim_timesteps]
alphas_prev = np.asarray([alphacums[0]] + alphacums[ddim_timesteps[:-1]].tolist())
# according the the formula provided in https://arxiv.org/abs/2010.02502
sigmas = eta * np.sqrt((1 - alphas_prev) / (1 - alphas) * (1 - alphas / alphas_prev))
if verbose:
print(f'Selected alphas for ddim sampler: a_t: {alphas}; a_(t-1): {alphas_prev}')
print(f'For the chosen value of eta, which is {eta}, '
f'this results in the following sigma_t schedule for ddim sampler {sigmas}')
return sigmas, alphas, alphas_prev
def betas_for_alpha_bar(num_diffusion_timesteps, alpha_bar, max_beta=0.999):
"""
Create a beta schedule that discretizes the given alpha_t_bar function,
which defines the cumulative product of (1-beta) over time from t = [0,1].
:param num_diffusion_timesteps: the number of betas to produce.
:param alpha_bar: a lambda that takes an argument t from 0 to 1 and
produces the cumulative product of (1-beta) up to that
part of the diffusion process.
:param max_beta: the maximum beta to use; use values lower than 1 to
prevent singularities.
"""
betas = []
for i in range(num_diffusion_timesteps):
t1 = i / num_diffusion_timesteps
t2 = (i + 1) / num_diffusion_timesteps
betas.append(min(1 - alpha_bar(t2) / alpha_bar(t1), max_beta))
return np.array(betas)
def extract_into_tensor(a, t, x_shape):
b, *_ = t.shape
out = a.gather(-1, t)
return out.reshape(b, *((1,) * (len(x_shape) - 1)))
def checkpoint(func, inputs, params, flag):
"""
Evaluate a function without caching intermediate activations, allowing for
reduced memory at the expense of extra compute in the backward pass.
:param func: the function to evaluate.
:param inputs: the argument sequence to pass to `func`.
:param params: a sequence of parameters `func` depends on but does not
explicitly take as arguments.
:param flag: if False, disable gradient checkpointing.
"""
if flag:
args = tuple(inputs) + tuple(params)
return CheckpointFunction.apply(func, len(inputs), *args)
else:
return func(*inputs)
class CheckpointFunction(torch.autograd.Function):
@staticmethod
def forward(ctx, run_function, length, *args):
ctx.run_function = run_function
ctx.input_tensors = list(args[:length])
ctx.input_params = list(args[length:])
ctx.gpu_autocast_kwargs = {"enabled": torch.is_autocast_enabled(),
"dtype": torch.get_autocast_gpu_dtype(),
"cache_enabled": torch.is_autocast_cache_enabled()}
with torch.no_grad():
output_tensors = ctx.run_function(*ctx.input_tensors)
return output_tensors
@staticmethod
def backward(ctx, *output_grads):
ctx.input_tensors = [x.detach().requires_grad_(True) for x in ctx.input_tensors]
with torch.enable_grad(), \
torch.cuda.amp.autocast(**ctx.gpu_autocast_kwargs):
# Fixes a bug where the first op in run_function modifies the
# Tensor storage in place, which is not allowed for detach()'d
# Tensors.
shallow_copies = [x.view_as(x) for x in ctx.input_tensors]
output_tensors = ctx.run_function(*shallow_copies)
input_grads = torch.autograd.grad(
output_tensors,
ctx.input_tensors + ctx.input_params,
output_grads,
allow_unused=True,
)
del ctx.input_tensors
del ctx.input_params
del output_tensors
return (None, None) + input_grads
def timestep_embedding(timesteps, dim, max_period=10000, repeat_only=False):
"""
Create sinusoidal timestep embeddings.
:param timesteps: a 1-D Tensor of N indices, one per batch element.
These may be fractional.
:param dim: the dimension of the output.
:param max_period: controls the minimum frequency of the embeddings.
:return: an [N x dim] Tensor of positional embeddings.
"""
if not repeat_only:
half = dim // 2
freqs = torch.exp(
-math.log(max_period) * torch.arange(start=0, end=half, dtype=torch.float32, device=timesteps.device) / half
)
args = timesteps[:, None].float() * freqs[None]
embedding = torch.cat([torch.cos(args), torch.sin(args)], dim=-1)
if dim % 2:
embedding = torch.cat([embedding, torch.zeros_like(embedding[:, :1])], dim=-1)
else:
embedding = repeat(timesteps, 'b -> b d', d=dim)
return embedding
def zero_module(module):
"""
Zero out the parameters of a module and return it.
"""
for p in module.parameters():
p.detach().zero_()
return module
def scale_module(module, scale):
"""
Scale the parameters of a module and return it.
"""
for p in module.parameters():
p.detach().mul_(scale)
return module
def mean_flat(tensor):
"""
Take the mean over all non-batch dimensions.
"""
return tensor.mean(dim=list(range(1, len(tensor.shape))))
def avg_pool_nd(dims, *args, **kwargs):
"""
Create a 1D, 2D, or 3D average pooling module.
"""
if dims == 1:
return nn.AvgPool1d(*args, **kwargs)
elif dims == 2:
return nn.AvgPool2d(*args, **kwargs)
elif dims == 3:
return nn.AvgPool3d(*args, **kwargs)
raise ValueError(f"unsupported dimensions: {dims}")
class HybridConditioner(nn.Module):
def __init__(self, c_concat_config, c_crossattn_config):
super().__init__()
self.concat_conditioner = instantiate_from_config(c_concat_config)
self.crossattn_conditioner = instantiate_from_config(c_crossattn_config)
def forward(self, c_concat, c_crossattn):
c_concat = self.concat_conditioner(c_concat)
c_crossattn = self.crossattn_conditioner(c_crossattn)
return {'c_concat': [c_concat], 'c_crossattn': [c_crossattn]}
def noise_like(shape, device, repeat=False):
repeat_noise = lambda: torch.randn((1, *shape[1:]), device=device).repeat(shape[0], *((1,) * (len(shape) - 1)))
noise = lambda: torch.randn(shape, device=device)
return repeat_noise() if repeat else noise()

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comfy/ldm/modules/distributions/__init__.py Normal file
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comfy/ldm/modules/distributions/distributions.py Normal file
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import torch
import numpy as np
class AbstractDistribution:
def sample(self):
raise NotImplementedError()
def mode(self):
raise NotImplementedError()
class DiracDistribution(AbstractDistribution):
def __init__(self, value):
self.value = value
def sample(self):
return self.value
def mode(self):
return self.value
class DiagonalGaussianDistribution(object):
def __init__(self, parameters, deterministic=False):
self.parameters = parameters
self.mean, self.logvar = torch.chunk(parameters, 2, dim=1)
self.logvar = torch.clamp(self.logvar, -30.0, 20.0)
self.deterministic = deterministic
self.std = torch.exp(0.5 * self.logvar)
self.var = torch.exp(self.logvar)
if self.deterministic:
self.var = self.std = torch.zeros_like(self.mean).to(device=self.parameters.device)
def sample(self):
x = self.mean + self.std * torch.randn(self.mean.shape).to(device=self.parameters.device)
return x
def kl(self, other=None):
if self.deterministic:
return torch.Tensor([0.])
else:
if other is None:
return 0.5 * torch.sum(torch.pow(self.mean, 2)
+ self.var - 1.0 - self.logvar,
dim=[1, 2, 3])
else:
return 0.5 * torch.sum(
torch.pow(self.mean - other.mean, 2) / other.var
+ self.var / other.var - 1.0 - self.logvar + other.logvar,
dim=[1, 2, 3])
def nll(self, sample, dims=[1,2,3]):
if self.deterministic:
return torch.Tensor([0.])
logtwopi = np.log(2.0 * np.pi)
return 0.5 * torch.sum(
logtwopi + self.logvar + torch.pow(sample - self.mean, 2) / self.var,
dim=dims)
def mode(self):
return self.mean
def normal_kl(mean1, logvar1, mean2, logvar2):
"""
source: https://github.com/openai/guided-diffusion/blob/27c20a8fab9cb472df5d6bdd6c8d11c8f430b924/guided_diffusion/losses.py#L12
Compute the KL divergence between two gaussians.
Shapes are automatically broadcasted, so batches can be compared to
scalars, among other use cases.
"""
tensor = None
for obj in (mean1, logvar1, mean2, logvar2):
if isinstance(obj, torch.Tensor):
tensor = obj
break
assert tensor is not None, "at least one argument must be a Tensor"
# Force variances to be Tensors. Broadcasting helps convert scalars to
# Tensors, but it does not work for torch.exp().
logvar1, logvar2 = [
x if isinstance(x, torch.Tensor) else torch.tensor(x).to(tensor)
for x in (logvar1, logvar2)
]
return 0.5 * (
-1.0
+ logvar2
- logvar1
+ torch.exp(logvar1 - logvar2)
+ ((mean1 - mean2) ** 2) * torch.exp(-logvar2)
)

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import torch
from torch import nn
class LitEma(nn.Module):
def __init__(self, model, decay=0.9999, use_num_upates=True):
super().__init__()
if decay < 0.0 or decay > 1.0:
raise ValueError('Decay must be between 0 and 1')
self.m_name2s_name = {}
self.register_buffer('decay', torch.tensor(decay, dtype=torch.float32))
self.register_buffer('num_updates', torch.tensor(0, dtype=torch.int) if use_num_upates
else torch.tensor(-1, dtype=torch.int))
for name, p in model.named_parameters():
if p.requires_grad:
# remove as '.'-character is not allowed in buffers
s_name = name.replace('.', '')
self.m_name2s_name.update({name: s_name})
self.register_buffer(s_name, p.clone().detach().data)
self.collected_params = []
def reset_num_updates(self):
del self.num_updates
self.register_buffer('num_updates', torch.tensor(0, dtype=torch.int))
def forward(self, model):
decay = self.decay
if self.num_updates >= 0:
self.num_updates += 1
decay = min(self.decay, (1 + self.num_updates) / (10 + self.num_updates))
one_minus_decay = 1.0 - decay
with torch.no_grad():
m_param = dict(model.named_parameters())
shadow_params = dict(self.named_buffers())
for key in m_param:
if m_param[key].requires_grad:
sname = self.m_name2s_name[key]
shadow_params[sname] = shadow_params[sname].type_as(m_param[key])
shadow_params[sname].sub_(one_minus_decay * (shadow_params[sname] - m_param[key]))
else:
assert not key in self.m_name2s_name
def copy_to(self, model):
m_param = dict(model.named_parameters())
shadow_params = dict(self.named_buffers())
for key in m_param:
if m_param[key].requires_grad:
m_param[key].data.copy_(shadow_params[self.m_name2s_name[key]].data)
else:
assert not key in self.m_name2s_name
def store(self, parameters):
"""
Save the current parameters for restoring later.
Args:
parameters: Iterable of `torch.nn.Parameter`; the parameters to be
temporarily stored.
"""
self.collected_params = [param.clone() for param in parameters]
def restore(self, parameters):
"""
Restore the parameters stored with the `store` method.
Useful to validate the model with EMA parameters without affecting the
original optimization process. Store the parameters before the
`copy_to` method. After validation (or model saving), use this to
restore the former parameters.
Args:
parameters: Iterable of `torch.nn.Parameter`; the parameters to be
updated with the stored parameters.
"""
for c_param, param in zip(self.collected_params, parameters):
param.data.copy_(c_param.data)

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comfy/ldm/modules/encoders/__init__.py Normal file
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comfy/ldm/modules/encoders/noise_aug_modules.py Normal file
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from ..diffusionmodules.upscaling import ImageConcatWithNoiseAugmentation
from ..diffusionmodules.openaimodel import Timestep
import torch
class CLIPEmbeddingNoiseAugmentation(ImageConcatWithNoiseAugmentation):
def __init__(self, *args, clip_stats_path=None, timestep_dim=256, **kwargs):
super().__init__(*args, **kwargs)
if clip_stats_path is None:
clip_mean, clip_std = torch.zeros(timestep_dim), torch.ones(timestep_dim)
else:
clip_mean, clip_std = torch.load(clip_stats_path, map_location="cpu")
self.register_buffer("data_mean", clip_mean[None, :], persistent=False)
self.register_buffer("data_std", clip_std[None, :], persistent=False)
self.time_embed = Timestep(timestep_dim)
def scale(self, x):
# re-normalize to centered mean and unit variance
x = (x - self.data_mean.to(x.device)) * 1. / self.data_std.to(x.device)
return x
def unscale(self, x):
# back to original data stats
x = (x * self.data_std.to(x.device)) + self.data_mean.to(x.device)
return x
def forward(self, x, noise_level=None, seed=None):
if noise_level is None:
noise_level = torch.randint(0, self.max_noise_level, (x.shape[0],), device=x.device).long()
else:
assert isinstance(noise_level, torch.Tensor)
x = self.scale(x)
z = self.q_sample(x, noise_level, seed=seed)
z = self.unscale(z)
noise_level = self.time_embed(noise_level)
return z, noise_level

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comfy/ldm/modules/sub_quadratic_attention.py Normal file
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# original source:
# https://github.com/AminRezaei0x443/memory-efficient-attention/blob/1bc0d9e6ac5f82ea43a375135c4e1d3896ee1694/memory_efficient_attention/attention_torch.py
# license:
# MIT
# credit:
# Amin Rezaei (original author)
# Alex Birch (optimized algorithm for 3D tensors, at the expense of removing bias, masking and callbacks)
# implementation of:
# Self-attention Does Not Need O(n2) Memory":
# https://arxiv.org/abs/2112.05682v2
from functools import partial
import torch
from torch import Tensor
from torch.utils.checkpoint import checkpoint
import math
import logging
try:
from typing import Optional, NamedTuple, List, Protocol
except ImportError:
from typing import Optional, NamedTuple, List
from typing_extensions import Protocol
from torch import Tensor
from typing import List
from comfy import model_management
def dynamic_slice(
x: Tensor,
starts: List[int],
sizes: List[int],
) -> Tensor:
slicing = [slice(start, start + size) for start, size in zip(starts, sizes)]
return x[slicing]
class AttnChunk(NamedTuple):
exp_values: Tensor
exp_weights_sum: Tensor
max_score: Tensor
class SummarizeChunk(Protocol):
@staticmethod
def __call__(
query: Tensor,
key_t: Tensor,
value: Tensor,
) -> AttnChunk: ...
class ComputeQueryChunkAttn(Protocol):
@staticmethod
def __call__(
query: Tensor,
key_t: Tensor,
value: Tensor,
) -> Tensor: ...
def _summarize_chunk(
query: Tensor,
key_t: Tensor,
value: Tensor,
scale: float,
upcast_attention: bool,
mask,
) -> AttnChunk:
if upcast_attention:
with torch.autocast(enabled=False, device_type = 'cuda'):
query = query.float()
key_t = key_t.float()
attn_weights = torch.baddbmm(
torch.empty(1, 1, 1, device=query.device, dtype=query.dtype),
query,
key_t,
alpha=scale,
beta=0,
)
else:
attn_weights = torch.baddbmm(
torch.empty(1, 1, 1, device=query.device, dtype=query.dtype),
query,
key_t,
alpha=scale,
beta=0,
)
max_score, _ = torch.max(attn_weights, -1, keepdim=True)
max_score = max_score.detach()
attn_weights -= max_score
if mask is not None:
attn_weights += mask
torch.exp(attn_weights, out=attn_weights)
exp_weights = attn_weights.to(value.dtype)
exp_values = torch.bmm(exp_weights, value)
max_score = max_score.squeeze(-1)
return AttnChunk(exp_values, exp_weights.sum(dim=-1), max_score)
def _query_chunk_attention(
query: Tensor,
key_t: Tensor,
value: Tensor,
summarize_chunk: SummarizeChunk,
kv_chunk_size: int,
mask,
) -> Tensor:
batch_x_heads, k_channels_per_head, k_tokens = key_t.shape
_, _, v_channels_per_head = value.shape
def chunk_scanner(chunk_idx: int, mask) -> AttnChunk:
key_chunk = dynamic_slice(
key_t,
(0, 0, chunk_idx),
(batch_x_heads, k_channels_per_head, kv_chunk_size)
)
value_chunk = dynamic_slice(
value,
(0, chunk_idx, 0),
(batch_x_heads, kv_chunk_size, v_channels_per_head)
)
if mask is not None:
mask = mask[:,:,chunk_idx:chunk_idx + kv_chunk_size]
return summarize_chunk(query, key_chunk, value_chunk, mask=mask)
chunks: List[AttnChunk] = [
chunk_scanner(chunk, mask) for chunk in torch.arange(0, k_tokens, kv_chunk_size)
]
acc_chunk = AttnChunk(*map(torch.stack, zip(*chunks)))
chunk_values, chunk_weights, chunk_max = acc_chunk
global_max, _ = torch.max(chunk_max, 0, keepdim=True)
max_diffs = torch.exp(chunk_max - global_max)
chunk_values *= torch.unsqueeze(max_diffs, -1)
chunk_weights *= max_diffs
all_values = chunk_values.sum(dim=0)
all_weights = torch.unsqueeze(chunk_weights, -1).sum(dim=0)
return all_values / all_weights
# TODO: refactor CrossAttention#get_attention_scores to share code with this
def _get_attention_scores_no_kv_chunking(
query: Tensor,
key_t: Tensor,
value: Tensor,
scale: float,
upcast_attention: bool,
mask,
) -> Tensor:
if upcast_attention:
with torch.autocast(enabled=False, device_type = 'cuda'):
query = query.float()
key_t = key_t.float()
attn_scores = torch.baddbmm(
torch.empty(1, 1, 1, device=query.device, dtype=query.dtype),
query,
key_t,
alpha=scale,
beta=0,
)
else:
attn_scores = torch.baddbmm(
torch.empty(1, 1, 1, device=query.device, dtype=query.dtype),
query,
key_t,
alpha=scale,
beta=0,
)
if mask is not None:
attn_scores += mask
try:
attn_probs = attn_scores.softmax(dim=-1)
del attn_scores
except model_management.OOM_EXCEPTION:
logging.warning("ran out of memory while running softmax in _get_attention_scores_no_kv_chunking, trying slower in place softmax instead")
attn_scores -= attn_scores.max(dim=-1, keepdim=True).values
torch.exp(attn_scores, out=attn_scores)
summed = torch.sum(attn_scores, dim=-1, keepdim=True)
attn_scores /= summed
attn_probs = attn_scores
hidden_states_slice = torch.bmm(attn_probs.to(value.dtype), value)
return hidden_states_slice
class ScannedChunk(NamedTuple):
chunk_idx: int
attn_chunk: AttnChunk
def efficient_dot_product_attention(
query: Tensor,
key_t: Tensor,
value: Tensor,
query_chunk_size=1024,
kv_chunk_size: Optional[int] = None,
kv_chunk_size_min: Optional[int] = None,
use_checkpoint=True,
upcast_attention=False,
mask = None,
):
"""Computes efficient dot-product attention given query, transposed key, and value.
This is efficient version of attention presented in
https://arxiv.org/abs/2112.05682v2 which comes with O(sqrt(n)) memory requirements.
Args:
query: queries for calculating attention with shape of
`[batch * num_heads, tokens, channels_per_head]`.
key_t: keys for calculating attention with shape of
`[batch * num_heads, channels_per_head, tokens]`.
value: values to be used in attention with shape of
`[batch * num_heads, tokens, channels_per_head]`.
query_chunk_size: int: query chunks size
kv_chunk_size: Optional[int]: key/value chunks size. if None: defaults to sqrt(key_tokens)
kv_chunk_size_min: Optional[int]: key/value minimum chunk size. only considered when kv_chunk_size is None. changes `sqrt(key_tokens)` into `max(sqrt(key_tokens), kv_chunk_size_min)`, to ensure our chunk sizes don't get too small (smaller chunks = more chunks = less concurrent work done).
use_checkpoint: bool: whether to use checkpointing (recommended True for training, False for inference)
Returns:
Output of shape `[batch * num_heads, query_tokens, channels_per_head]`.
"""
batch_x_heads, q_tokens, q_channels_per_head = query.shape
_, _, k_tokens = key_t.shape
scale = q_channels_per_head ** -0.5
kv_chunk_size = min(kv_chunk_size or int(math.sqrt(k_tokens)), k_tokens)
if kv_chunk_size_min is not None:
kv_chunk_size = max(kv_chunk_size, kv_chunk_size_min)
if mask is not None and len(mask.shape) == 2:
mask = mask.unsqueeze(0)
def get_query_chunk(chunk_idx: int) -> Tensor:
return dynamic_slice(
query,
(0, chunk_idx, 0),
(batch_x_heads, min(query_chunk_size, q_tokens), q_channels_per_head)
)
def get_mask_chunk(chunk_idx: int) -> Tensor:
if mask is None:
return None
chunk = min(query_chunk_size, q_tokens)
return mask[:,chunk_idx:chunk_idx + chunk]
summarize_chunk: SummarizeChunk = partial(_summarize_chunk, scale=scale, upcast_attention=upcast_attention)
summarize_chunk: SummarizeChunk = partial(checkpoint, summarize_chunk) if use_checkpoint else summarize_chunk
compute_query_chunk_attn: ComputeQueryChunkAttn = partial(
_get_attention_scores_no_kv_chunking,
scale=scale,
upcast_attention=upcast_attention
) if k_tokens <= kv_chunk_size else (
# fast-path for when there's just 1 key-value chunk per query chunk (this is just sliced attention btw)
partial(
_query_chunk_attention,
kv_chunk_size=kv_chunk_size,
summarize_chunk=summarize_chunk,
)
)
if q_tokens <= query_chunk_size:
# fast-path for when there's just 1 query chunk
return compute_query_chunk_attn(
query=query,
key_t=key_t,
value=value,
mask=mask,
)
# TODO: maybe we should use torch.empty_like(query) to allocate storage in-advance,
# and pass slices to be mutated, instead of torch.cat()ing the returned slices
res = torch.cat([
compute_query_chunk_attn(
query=get_query_chunk(i * query_chunk_size),
key_t=key_t,
value=value,
mask=get_mask_chunk(i * query_chunk_size)
) for i in range(math.ceil(q_tokens / query_chunk_size))
], dim=1)
return res

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import functools
from typing import Callable, Iterable, Union
import torch
from einops import rearrange, repeat
import comfy.ops
ops = comfy.ops.disable_weight_init
from .diffusionmodules.model import (
AttnBlock,
Decoder,
ResnetBlock,
)
from .diffusionmodules.openaimodel import ResBlock, timestep_embedding
from .attention import BasicTransformerBlock
def partialclass(cls, *args, **kwargs):
class NewCls(cls):
__init__ = functools.partialmethod(cls.__init__, *args, **kwargs)
return NewCls
class VideoResBlock(ResnetBlock):
def __init__(
self,
out_channels,
*args,
dropout=0.0,
video_kernel_size=3,
alpha=0.0,
merge_strategy="learned",
**kwargs,
):
super().__init__(out_channels=out_channels, dropout=dropout, *args, **kwargs)
if video_kernel_size is None:
video_kernel_size = [3, 1, 1]
self.time_stack = ResBlock(
channels=out_channels,
emb_channels=0,
dropout=dropout,
dims=3,
use_scale_shift_norm=False,
use_conv=False,
up=False,
down=False,
kernel_size=video_kernel_size,
use_checkpoint=False,
skip_t_emb=True,
)
self.merge_strategy = merge_strategy
if self.merge_strategy == "fixed":
self.register_buffer("mix_factor", torch.Tensor([alpha]))
elif self.merge_strategy == "learned":
self.register_parameter(
"mix_factor", torch.nn.Parameter(torch.Tensor([alpha]))
)
else:
raise ValueError(f"unknown merge strategy {self.merge_strategy}")
def get_alpha(self, bs):
if self.merge_strategy == "fixed":
return self.mix_factor
elif self.merge_strategy == "learned":
return torch.sigmoid(self.mix_factor)
else:
raise NotImplementedError()
def forward(self, x, temb, skip_video=False, timesteps=None):
b, c, h, w = x.shape
if timesteps is None:
timesteps = b
x = super().forward(x, temb)
if not skip_video:
x_mix = rearrange(x, "(b t) c h w -> b c t h w", t=timesteps)
x = rearrange(x, "(b t) c h w -> b c t h w", t=timesteps)
x = self.time_stack(x, temb)
alpha = self.get_alpha(bs=b // timesteps).to(x.device)
x = alpha * x + (1.0 - alpha) * x_mix
x = rearrange(x, "b c t h w -> (b t) c h w")
return x
class AE3DConv(ops.Conv2d):
def __init__(self, in_channels, out_channels, video_kernel_size=3, *args, **kwargs):
super().__init__(in_channels, out_channels, *args, **kwargs)
if isinstance(video_kernel_size, Iterable):
padding = [int(k // 2) for k in video_kernel_size]
else:
padding = int(video_kernel_size // 2)
self.time_mix_conv = ops.Conv3d(
in_channels=out_channels,
out_channels=out_channels,
kernel_size=video_kernel_size,
padding=padding,
)
def forward(self, input, timesteps=None, skip_video=False):
if timesteps is None:
timesteps = input.shape[0]
x = super().forward(input)
if skip_video:
return x
x = rearrange(x, "(b t) c h w -> b c t h w", t=timesteps)
x = self.time_mix_conv(x)
return rearrange(x, "b c t h w -> (b t) c h w")
class AttnVideoBlock(AttnBlock):
def __init__(
self, in_channels: int, alpha: float = 0, merge_strategy: str = "learned"
):
super().__init__(in_channels)
# no context, single headed, as in base class
self.time_mix_block = BasicTransformerBlock(
dim=in_channels,
n_heads=1,
d_head=in_channels,
checkpoint=False,
ff_in=True,
)
time_embed_dim = self.in_channels * 4
self.video_time_embed = torch.nn.Sequential(
ops.Linear(self.in_channels, time_embed_dim),
torch.nn.SiLU(),
ops.Linear(time_embed_dim, self.in_channels),
)
self.merge_strategy = merge_strategy
if self.merge_strategy == "fixed":
self.register_buffer("mix_factor", torch.Tensor([alpha]))
elif self.merge_strategy == "learned":
self.register_parameter(
"mix_factor", torch.nn.Parameter(torch.Tensor([alpha]))
)
else:
raise ValueError(f"unknown merge strategy {self.merge_strategy}")
def forward(self, x, timesteps=None, skip_time_block=False):
if skip_time_block:
return super().forward(x)
if timesteps is None:
timesteps = x.shape[0]
x_in = x
x = self.attention(x)
h, w = x.shape[2:]
x = rearrange(x, "b c h w -> b (h w) c")
x_mix = x
num_frames = torch.arange(timesteps, device=x.device)
num_frames = repeat(num_frames, "t -> b t", b=x.shape[0] // timesteps)
num_frames = rearrange(num_frames, "b t -> (b t)")
t_emb = timestep_embedding(num_frames, self.in_channels, repeat_only=False)
emb = self.video_time_embed(t_emb) # b, n_channels
emb = emb[:, None, :]
x_mix = x_mix + emb
alpha = self.get_alpha().to(x.device)
x_mix = self.time_mix_block(x_mix, timesteps=timesteps)
x = alpha * x + (1.0 - alpha) * x_mix # alpha merge
x = rearrange(x, "b (h w) c -> b c h w", h=h, w=w)
x = self.proj_out(x)
return x_in + x
def get_alpha(
self,
):
if self.merge_strategy == "fixed":
return self.mix_factor
elif self.merge_strategy == "learned":
return torch.sigmoid(self.mix_factor)
else:
raise NotImplementedError(f"unknown merge strategy {self.merge_strategy}")
def make_time_attn(
in_channels,
attn_type="vanilla",
attn_kwargs=None,
alpha: float = 0,
merge_strategy: str = "learned",
):
return partialclass(
AttnVideoBlock, in_channels, alpha=alpha, merge_strategy=merge_strategy
)
class Conv2DWrapper(torch.nn.Conv2d):
def forward(self, input: torch.Tensor, **kwargs) -> torch.Tensor:
return super().forward(input)
class VideoDecoder(Decoder):
available_time_modes = ["all", "conv-only", "attn-only"]
def __init__(
self,
*args,
video_kernel_size: Union[int, list] = 3,
alpha: float = 0.0,
merge_strategy: str = "learned",
time_mode: str = "conv-only",
**kwargs,
):
self.video_kernel_size = video_kernel_size
self.alpha = alpha
self.merge_strategy = merge_strategy
self.time_mode = time_mode
assert (
self.time_mode in self.available_time_modes
), f"time_mode parameter has to be in {self.available_time_modes}"
if self.time_mode != "attn-only":
kwargs["conv_out_op"] = partialclass(AE3DConv, video_kernel_size=self.video_kernel_size)
if self.time_mode not in ["conv-only", "only-last-conv"]:
kwargs["attn_op"] = partialclass(make_time_attn, alpha=self.alpha, merge_strategy=self.merge_strategy)
if self.time_mode not in ["attn-only", "only-last-conv"]:
kwargs["resnet_op"] = partialclass(VideoResBlock, video_kernel_size=self.video_kernel_size, alpha=self.alpha, merge_strategy=self.merge_strategy)
super().__init__(*args, **kwargs)
def get_last_layer(self, skip_time_mix=False, **kwargs):
if self.time_mode == "attn-only":
raise NotImplementedError("TODO")
else:
return (
self.conv_out.time_mix_conv.weight
if not skip_time_mix
else self.conv_out.weight
)

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import importlib
import torch
from torch import optim
import numpy as np
from inspect import isfunction
from PIL import Image, ImageDraw, ImageFont
def log_txt_as_img(wh, xc, size=10):
# wh a tuple of (width, height)
# xc a list of captions to plot
b = len(xc)
txts = list()
for bi in range(b):
txt = Image.new("RGB", wh, color="white")
draw = ImageDraw.Draw(txt)
font = ImageFont.truetype('data/DejaVuSans.ttf', size=size)
nc = int(40 * (wh[0] / 256))
lines = "\n".join(xc[bi][start:start + nc] for start in range(0, len(xc[bi]), nc))
try:
draw.text((0, 0), lines, fill="black", font=font)
except UnicodeEncodeError:
print("Cant encode string for logging. Skipping.")
txt = np.array(txt).transpose(2, 0, 1) / 127.5 - 1.0
txts.append(txt)
txts = np.stack(txts)
txts = torch.tensor(txts)
return txts
def ismap(x):
if not isinstance(x, torch.Tensor):
return False
return (len(x.shape) == 4) and (x.shape[1] > 3)
def isimage(x):
if not isinstance(x,torch.Tensor):
return False
return (len(x.shape) == 4) and (x.shape[1] == 3 or x.shape[1] == 1)
def exists(x):
return x is not None
def default(val, d):
if exists(val):
return val
return d() if isfunction(d) else d
def mean_flat(tensor):
"""
https://github.com/openai/guided-diffusion/blob/27c20a8fab9cb472df5d6bdd6c8d11c8f430b924/guided_diffusion/nn.py#L86
Take the mean over all non-batch dimensions.
"""
return tensor.mean(dim=list(range(1, len(tensor.shape))))
def count_params(model, verbose=False):
total_params = sum(p.numel() for p in model.parameters())
if verbose:
print(f"{model.__class__.__name__} has {total_params*1.e-6:.2f} M params.")
return total_params
def instantiate_from_config(config):
if not "target" in config:
if config == '__is_first_stage__':
return None
elif config == "__is_unconditional__":
return None
raise KeyError("Expected key `target` to instantiate.")
return get_obj_from_str(config["target"])(**config.get("params", dict()))
def get_obj_from_str(string, reload=False):
module, cls = string.rsplit(".", 1)
if reload:
module_imp = importlib.import_module(module)
importlib.reload(module_imp)
return getattr(importlib.import_module(module, package=None), cls)
class AdamWwithEMAandWings(optim.Optimizer):
# credit to https://gist.github.com/crowsonkb/65f7265353f403714fce3b2595e0b298
def __init__(self, params, lr=1.e-3, betas=(0.9, 0.999), eps=1.e-8, # TODO: check hyperparameters before using
weight_decay=1.e-2, amsgrad=False, ema_decay=0.9999, # ema decay to match previous code
ema_power=1., param_names=()):
"""AdamW that saves EMA versions of the parameters."""
if not 0.0 <= lr:
raise ValueError("Invalid learning rate: {}".format(lr))
if not 0.0 <= eps:
raise ValueError("Invalid epsilon value: {}".format(eps))
if not 0.0 <= betas[0] < 1.0:
raise ValueError("Invalid beta parameter at index 0: {}".format(betas[0]))
if not 0.0 <= betas[1] < 1.0:
raise ValueError("Invalid beta parameter at index 1: {}".format(betas[1]))
if not 0.0 <= weight_decay:
raise ValueError("Invalid weight_decay value: {}".format(weight_decay))
if not 0.0 <= ema_decay <= 1.0:
raise ValueError("Invalid ema_decay value: {}".format(ema_decay))
defaults = dict(lr=lr, betas=betas, eps=eps,
weight_decay=weight_decay, amsgrad=amsgrad, ema_decay=ema_decay,
ema_power=ema_power, param_names=param_names)
super().__init__(params, defaults)
def __setstate__(self, state):
super().__setstate__(state)
for group in self.param_groups:
group.setdefault('amsgrad', False)
@torch.no_grad()
def step(self, closure=None):
"""Performs a single optimization step.
Args:
closure (callable, optional): A closure that reevaluates the model
and returns the loss.
"""
loss = None
if closure is not None:
with torch.enable_grad():
loss = closure()
for group in self.param_groups:
params_with_grad = []
grads = []
exp_avgs = []
exp_avg_sqs = []
ema_params_with_grad = []
state_sums = []
max_exp_avg_sqs = []
state_steps = []
amsgrad = group['amsgrad']
beta1, beta2 = group['betas']
ema_decay = group['ema_decay']
ema_power = group['ema_power']
for p in group['params']:
if p.grad is None:
continue
params_with_grad.append(p)
if p.grad.is_sparse:
raise RuntimeError('AdamW does not support sparse gradients')
grads.append(p.grad)
state = self.state[p]
# State initialization
if len(state) == 0:
state['step'] = 0
# Exponential moving average of gradient values
state['exp_avg'] = torch.zeros_like(p, memory_format=torch.preserve_format)
# Exponential moving average of squared gradient values
state['exp_avg_sq'] = torch.zeros_like(p, memory_format=torch.preserve_format)
if amsgrad:
# Maintains max of all exp. moving avg. of sq. grad. values
state['max_exp_avg_sq'] = torch.zeros_like(p, memory_format=torch.preserve_format)
# Exponential moving average of parameter values
state['param_exp_avg'] = p.detach().float().clone()
exp_avgs.append(state['exp_avg'])
exp_avg_sqs.append(state['exp_avg_sq'])
ema_params_with_grad.append(state['param_exp_avg'])
if amsgrad:
max_exp_avg_sqs.append(state['max_exp_avg_sq'])
# update the steps for each param group update
state['step'] += 1
# record the step after step update
state_steps.append(state['step'])
optim._functional.adamw(params_with_grad,
grads,
exp_avgs,
exp_avg_sqs,
max_exp_avg_sqs,
state_steps,
amsgrad=amsgrad,
beta1=beta1,
beta2=beta2,
lr=group['lr'],
weight_decay=group['weight_decay'],
eps=group['eps'],
maximize=False)
cur_ema_decay = min(ema_decay, 1 - state['step'] ** -ema_power)
for param, ema_param in zip(params_with_grad, ema_params_with_grad):
ema_param.mul_(cur_ema_decay).add_(param.float(), alpha=1 - cur_ema_decay)
return loss

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import comfy.utils
import logging
LORA_CLIP_MAP = {
"mlp.fc1": "mlp_fc1",
"mlp.fc2": "mlp_fc2",
"self_attn.k_proj": "self_attn_k_proj",
"self_attn.q_proj": "self_attn_q_proj",
"self_attn.v_proj": "self_attn_v_proj",
"self_attn.out_proj": "self_attn_out_proj",
}
def load_lora(lora, to_load):
patch_dict = {}
loaded_keys = set()
for x in to_load:
alpha_name = "{}.alpha".format(x)
alpha = None
if alpha_name in lora.keys():
alpha = lora[alpha_name].item()
loaded_keys.add(alpha_name)
dora_scale_name = "{}.dora_scale".format(x)
dora_scale = None
if dora_scale_name in lora.keys():
dora_scale = lora[dora_scale_name]
loaded_keys.add(dora_scale_name)
regular_lora = "{}.lora_up.weight".format(x)
diffusers_lora = "{}_lora.up.weight".format(x)
diffusers2_lora = "{}.lora_B.weight".format(x)
diffusers3_lora = "{}.lora.up.weight".format(x)
transformers_lora = "{}.lora_linear_layer.up.weight".format(x)
A_name = None
if regular_lora in lora.keys():
A_name = regular_lora
B_name = "{}.lora_down.weight".format(x)
mid_name = "{}.lora_mid.weight".format(x)
elif diffusers_lora in lora.keys():
A_name = diffusers_lora
B_name = "{}_lora.down.weight".format(x)
mid_name = None
elif diffusers2_lora in lora.keys():
A_name = diffusers2_lora
B_name = "{}.lora_A.weight".format(x)
mid_name = None
elif diffusers3_lora in lora.keys():
A_name = diffusers3_lora
B_name = "{}.lora.down.weight".format(x)
mid_name = None
elif transformers_lora in lora.keys():
A_name = transformers_lora
B_name ="{}.lora_linear_layer.down.weight".format(x)
mid_name = None
if A_name is not None:
mid = None
if mid_name is not None and mid_name in lora.keys():
mid = lora[mid_name]
loaded_keys.add(mid_name)
patch_dict[to_load[x]] = ("lora", (lora[A_name], lora[B_name], alpha, mid, dora_scale))
loaded_keys.add(A_name)
loaded_keys.add(B_name)
######## loha
hada_w1_a_name = "{}.hada_w1_a".format(x)
hada_w1_b_name = "{}.hada_w1_b".format(x)
hada_w2_a_name = "{}.hada_w2_a".format(x)
hada_w2_b_name = "{}.hada_w2_b".format(x)
hada_t1_name = "{}.hada_t1".format(x)
hada_t2_name = "{}.hada_t2".format(x)
if hada_w1_a_name in lora.keys():
hada_t1 = None
hada_t2 = None
if hada_t1_name in lora.keys():
hada_t1 = lora[hada_t1_name]
hada_t2 = lora[hada_t2_name]
loaded_keys.add(hada_t1_name)
loaded_keys.add(hada_t2_name)
patch_dict[to_load[x]] = ("loha", (lora[hada_w1_a_name], lora[hada_w1_b_name], alpha, lora[hada_w2_a_name], lora[hada_w2_b_name], hada_t1, hada_t2, dora_scale))
loaded_keys.add(hada_w1_a_name)
loaded_keys.add(hada_w1_b_name)
loaded_keys.add(hada_w2_a_name)
loaded_keys.add(hada_w2_b_name)
######## lokr
lokr_w1_name = "{}.lokr_w1".format(x)
lokr_w2_name = "{}.lokr_w2".format(x)
lokr_w1_a_name = "{}.lokr_w1_a".format(x)
lokr_w1_b_name = "{}.lokr_w1_b".format(x)
lokr_t2_name = "{}.lokr_t2".format(x)
lokr_w2_a_name = "{}.lokr_w2_a".format(x)
lokr_w2_b_name = "{}.lokr_w2_b".format(x)
lokr_w1 = None
if lokr_w1_name in lora.keys():
lokr_w1 = lora[lokr_w1_name]
loaded_keys.add(lokr_w1_name)
lokr_w2 = None
if lokr_w2_name in lora.keys():
lokr_w2 = lora[lokr_w2_name]
loaded_keys.add(lokr_w2_name)
lokr_w1_a = None
if lokr_w1_a_name in lora.keys():
lokr_w1_a = lora[lokr_w1_a_name]
loaded_keys.add(lokr_w1_a_name)
lokr_w1_b = None
if lokr_w1_b_name in lora.keys():
lokr_w1_b = lora[lokr_w1_b_name]
loaded_keys.add(lokr_w1_b_name)
lokr_w2_a = None
if lokr_w2_a_name in lora.keys():
lokr_w2_a = lora[lokr_w2_a_name]
loaded_keys.add(lokr_w2_a_name)
lokr_w2_b = None
if lokr_w2_b_name in lora.keys():
lokr_w2_b = lora[lokr_w2_b_name]
loaded_keys.add(lokr_w2_b_name)
lokr_t2 = None
if lokr_t2_name in lora.keys():
lokr_t2 = lora[lokr_t2_name]
loaded_keys.add(lokr_t2_name)
if (lokr_w1 is not None) or (lokr_w2 is not None) or (lokr_w1_a is not None) or (lokr_w2_a is not None):
patch_dict[to_load[x]] = ("lokr", (lokr_w1, lokr_w2, alpha, lokr_w1_a, lokr_w1_b, lokr_w2_a, lokr_w2_b, lokr_t2, dora_scale))
#glora
a1_name = "{}.a1.weight".format(x)
a2_name = "{}.a2.weight".format(x)
b1_name = "{}.b1.weight".format(x)
b2_name = "{}.b2.weight".format(x)
if a1_name in lora:
patch_dict[to_load[x]] = ("glora", (lora[a1_name], lora[a2_name], lora[b1_name], lora[b2_name], alpha, dora_scale))
loaded_keys.add(a1_name)
loaded_keys.add(a2_name)
loaded_keys.add(b1_name)
loaded_keys.add(b2_name)
w_norm_name = "{}.w_norm".format(x)
b_norm_name = "{}.b_norm".format(x)
w_norm = lora.get(w_norm_name, None)
b_norm = lora.get(b_norm_name, None)
if w_norm is not None:
loaded_keys.add(w_norm_name)
patch_dict[to_load[x]] = ("diff", (w_norm,))
if b_norm is not None:
loaded_keys.add(b_norm_name)
patch_dict["{}.bias".format(to_load[x][:-len(".weight")])] = ("diff", (b_norm,))
diff_name = "{}.diff".format(x)
diff_weight = lora.get(diff_name, None)
if diff_weight is not None:
patch_dict[to_load[x]] = ("diff", (diff_weight,))
loaded_keys.add(diff_name)
diff_bias_name = "{}.diff_b".format(x)
diff_bias = lora.get(diff_bias_name, None)
if diff_bias is not None:
patch_dict["{}.bias".format(to_load[x][:-len(".weight")])] = ("diff", (diff_bias,))
loaded_keys.add(diff_bias_name)
for x in lora.keys():
if x not in loaded_keys:
logging.warning("lora key not loaded: {}".format(x))
return patch_dict
def model_lora_keys_clip(model, key_map={}):
sdk = model.state_dict().keys()
text_model_lora_key = "lora_te_text_model_encoder_layers_{}_{}"
clip_l_present = False
for b in range(32): #TODO: clean up
for c in LORA_CLIP_MAP:
k = "clip_h.transformer.text_model.encoder.layers.{}.{}.weight".format(b, c)
if k in sdk:
lora_key = text_model_lora_key.format(b, LORA_CLIP_MAP[c])
key_map[lora_key] = k
lora_key = "lora_te1_text_model_encoder_layers_{}_{}".format(b, LORA_CLIP_MAP[c])
key_map[lora_key] = k
lora_key = "text_encoder.text_model.encoder.layers.{}.{}".format(b, c) #diffusers lora
key_map[lora_key] = k
k = "clip_l.transformer.text_model.encoder.layers.{}.{}.weight".format(b, c)
if k in sdk:
lora_key = text_model_lora_key.format(b, LORA_CLIP_MAP[c])
key_map[lora_key] = k
lora_key = "lora_te1_text_model_encoder_layers_{}_{}".format(b, LORA_CLIP_MAP[c]) #SDXL base
key_map[lora_key] = k
clip_l_present = True
lora_key = "text_encoder.text_model.encoder.layers.{}.{}".format(b, c) #diffusers lora
key_map[lora_key] = k
k = "clip_g.transformer.text_model.encoder.layers.{}.{}.weight".format(b, c)
if k in sdk:
if clip_l_present:
lora_key = "lora_te2_text_model_encoder_layers_{}_{}".format(b, LORA_CLIP_MAP[c]) #SDXL base
key_map[lora_key] = k
lora_key = "text_encoder_2.text_model.encoder.layers.{}.{}".format(b, c) #diffusers lora
key_map[lora_key] = k
else:
lora_key = "lora_te_text_model_encoder_layers_{}_{}".format(b, LORA_CLIP_MAP[c]) #TODO: test if this is correct for SDXL-Refiner
key_map[lora_key] = k
lora_key = "text_encoder.text_model.encoder.layers.{}.{}".format(b, c) #diffusers lora
key_map[lora_key] = k
lora_key = "lora_prior_te_text_model_encoder_layers_{}_{}".format(b, LORA_CLIP_MAP[c]) #cascade lora: TODO put lora key prefix in the model config
key_map[lora_key] = k
for k in sdk: #OneTrainer SD3 lora
if k.startswith("t5xxl.transformer.") and k.endswith(".weight"):
l_key = k[len("t5xxl.transformer."):-len(".weight")]
lora_key = "lora_te3_{}".format(l_key.replace(".", "_"))
key_map[lora_key] = k
k = "clip_g.transformer.text_projection.weight"
if k in sdk:
key_map["lora_prior_te_text_projection"] = k #cascade lora?
# key_map["text_encoder.text_projection"] = k #TODO: check if other lora have the text_projection too
key_map["lora_te2_text_projection"] = k #OneTrainer SD3 lora
k = "clip_l.transformer.text_projection.weight"
if k in sdk:
key_map["lora_te1_text_projection"] = k #OneTrainer SD3 lora, not necessary but omits warning
return key_map
def model_lora_keys_unet(model, key_map={}):
sd = model.state_dict()
sdk = sd.keys()
for k in sdk:
if k.startswith("diffusion_model.") and k.endswith(".weight"):
key_lora = k[len("diffusion_model."):-len(".weight")].replace(".", "_")
key_map["lora_unet_{}".format(key_lora)] = k
key_map["lora_prior_unet_{}".format(key_lora)] = k #cascade lora: TODO put lora key prefix in the model config
diffusers_keys = comfy.utils.unet_to_diffusers(model.model_config.unet_config)
for k in diffusers_keys:
if k.endswith(".weight"):
unet_key = "diffusion_model.{}".format(diffusers_keys[k])
key_lora = k[:-len(".weight")].replace(".", "_")
key_map["lora_unet_{}".format(key_lora)] = unet_key
diffusers_lora_prefix = ["", "unet."]
for p in diffusers_lora_prefix:
diffusers_lora_key = "{}{}".format(p, k[:-len(".weight")].replace(".to_", ".processor.to_"))
if diffusers_lora_key.endswith(".to_out.0"):
diffusers_lora_key = diffusers_lora_key[:-2]
key_map[diffusers_lora_key] = unet_key
if isinstance(model, comfy.model_base.SD3): #Diffusers lora SD3
diffusers_keys = comfy.utils.mmdit_to_diffusers(model.model_config.unet_config, output_prefix="diffusion_model.")
for k in diffusers_keys:
if k.endswith(".weight"):
to = diffusers_keys[k]
key_lora = "transformer.{}".format(k[:-len(".weight")]) #regular diffusers sd3 lora format
key_map[key_lora] = to
key_lora = "base_model.model.{}".format(k[:-len(".weight")]) #format for flash-sd3 lora and others?
key_map[key_lora] = to
key_lora = "lora_transformer_{}".format(k[:-len(".weight")].replace(".", "_")) #OneTrainer lora
key_map[key_lora] = to
if isinstance(model, comfy.model_base.AuraFlow): #Diffusers lora AuraFlow
diffusers_keys = comfy.utils.auraflow_to_diffusers(model.model_config.unet_config, output_prefix="diffusion_model.")
for k in diffusers_keys:
if k.endswith(".weight"):
to = diffusers_keys[k]
key_lora = "transformer.{}".format(k[:-len(".weight")]) #simpletrainer and probably regular diffusers lora format
key_map[key_lora] = to
if isinstance(model, comfy.model_base.HunyuanDiT):
for k in sdk:
if k.startswith("diffusion_model.") and k.endswith(".weight"):
key_lora = k[len("diffusion_model."):-len(".weight")]
key_map["base_model.model.{}".format(key_lora)] = k #official hunyuan lora format
return key_map

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import torch
import logging
from comfy.ldm.modules.diffusionmodules.openaimodel import UNetModel, Timestep
from comfy.ldm.cascade.stage_c import StageC
from comfy.ldm.cascade.stage_b import StageB
from comfy.ldm.modules.encoders.noise_aug_modules import CLIPEmbeddingNoiseAugmentation
from comfy.ldm.modules.diffusionmodules.upscaling import ImageConcatWithNoiseAugmentation
from comfy.ldm.modules.diffusionmodules.mmdit import OpenAISignatureMMDITWrapper
import comfy.ldm.aura.mmdit
import comfy.ldm.hydit.models
import comfy.ldm.audio.dit
import comfy.ldm.audio.embedders
import comfy.ldm.flux.model
import comfy.model_management
import comfy.conds
import comfy.ops
from enum import Enum
from . import utils
import comfy.latent_formats
import math
class ModelType(Enum):
EPS = 1
V_PREDICTION = 2
V_PREDICTION_EDM = 3
STABLE_CASCADE = 4
EDM = 5
FLOW = 6
V_PREDICTION_CONTINUOUS = 7
FLUX = 8
from comfy.model_sampling import EPS, V_PREDICTION, EDM, ModelSamplingDiscrete, ModelSamplingContinuousEDM, StableCascadeSampling, ModelSamplingContinuousV
def model_sampling(model_config, model_type):
s = ModelSamplingDiscrete
if model_type == ModelType.EPS:
c = EPS
elif model_type == ModelType.V_PREDICTION:
c = V_PREDICTION
elif model_type == ModelType.V_PREDICTION_EDM:
c = V_PREDICTION
s = ModelSamplingContinuousEDM
elif model_type == ModelType.FLOW:
c = comfy.model_sampling.CONST
s = comfy.model_sampling.ModelSamplingDiscreteFlow
elif model_type == ModelType.STABLE_CASCADE:
c = EPS
s = StableCascadeSampling
elif model_type == ModelType.EDM:
c = EDM
s = ModelSamplingContinuousEDM
elif model_type == ModelType.V_PREDICTION_CONTINUOUS:
c = V_PREDICTION
s = ModelSamplingContinuousV
elif model_type == ModelType.FLUX:
c = comfy.model_sampling.CONST
s = comfy.model_sampling.ModelSamplingFlux
class ModelSampling(s, c):
pass
return ModelSampling(model_config)
class BaseModel(torch.nn.Module):
def __init__(self, model_config, model_type=ModelType.EPS, device=None, unet_model=UNetModel):
super().__init__()
unet_config = model_config.unet_config
self.latent_format = model_config.latent_format
self.model_config = model_config
self.manual_cast_dtype = model_config.manual_cast_dtype
if not unet_config.get("disable_unet_model_creation", False):
if self.manual_cast_dtype is not None:
operations = comfy.ops.manual_cast
else:
operations = comfy.ops.disable_weight_init
self.diffusion_model = unet_model(**unet_config, device=device, operations=operations)
if comfy.model_management.force_channels_last():
self.diffusion_model.to(memory_format=torch.channels_last)
logging.debug("using channels last mode for diffusion model")
self.model_type = model_type
self.model_sampling = model_sampling(model_config, model_type)
self.adm_channels = unet_config.get("adm_in_channels", None)
if self.adm_channels is None:
self.adm_channels = 0
self.concat_keys = ()
logging.info("model_type {}".format(model_type.name))
logging.debug("adm {}".format(self.adm_channels))
def apply_model(self, x, t, c_concat=None, c_crossattn=None, control=None, transformer_options={}, **kwargs):
sigma = t
xc = self.model_sampling.calculate_input(sigma, x)
if c_concat is not None:
xc = torch.cat([xc] + [c_concat], dim=1)
context = c_crossattn
dtype = self.get_dtype()
if self.manual_cast_dtype is not None:
dtype = self.manual_cast_dtype
xc = xc.to(dtype)
t = self.model_sampling.timestep(t).float()
context = context.to(dtype)
extra_conds = {}
for o in kwargs:
extra = kwargs[o]
if hasattr(extra, "dtype"):
if extra.dtype != torch.int and extra.dtype != torch.long:
extra = extra.to(dtype)
extra_conds[o] = extra
model_output = self.diffusion_model(xc, t, context=context, control=control, transformer_options=transformer_options, **extra_conds).float()
return self.model_sampling.calculate_denoised(sigma, model_output, x)
def get_dtype(self):
return self.diffusion_model.dtype
def is_adm(self):
return self.adm_channels > 0
def encode_adm(self, **kwargs):
return None
def extra_conds(self, **kwargs):
out = {}
if len(self.concat_keys) > 0:
cond_concat = []
denoise_mask = kwargs.get("concat_mask", kwargs.get("denoise_mask", None))
concat_latent_image = kwargs.get("concat_latent_image", None)
if concat_latent_image is None:
concat_latent_image = kwargs.get("latent_image", None)
else:
concat_latent_image = self.process_latent_in(concat_latent_image)
noise = kwargs.get("noise", None)
device = kwargs["device"]
if concat_latent_image.shape[1:] != noise.shape[1:]:
concat_latent_image = utils.common_upscale(concat_latent_image, noise.shape[-1], noise.shape[-2], "bilinear", "center")
concat_latent_image = utils.resize_to_batch_size(concat_latent_image, noise.shape[0])
if denoise_mask is not None:
if len(denoise_mask.shape) == len(noise.shape):
denoise_mask = denoise_mask[:,:1]
denoise_mask = denoise_mask.reshape((-1, 1, denoise_mask.shape[-2], denoise_mask.shape[-1]))
if denoise_mask.shape[-2:] != noise.shape[-2:]:
denoise_mask = utils.common_upscale(denoise_mask, noise.shape[-1], noise.shape[-2], "bilinear", "center")
denoise_mask = utils.resize_to_batch_size(denoise_mask.round(), noise.shape[0])
for ck in self.concat_keys:
if denoise_mask is not None:
if ck == "mask":
cond_concat.append(denoise_mask.to(device))
elif ck == "masked_image":
cond_concat.append(concat_latent_image.to(device)) #NOTE: the latent_image should be masked by the mask in pixel space
else:
if ck == "mask":
cond_concat.append(torch.ones_like(noise)[:,:1])
elif ck == "masked_image":
cond_concat.append(self.blank_inpaint_image_like(noise))
data = torch.cat(cond_concat, dim=1)
out['c_concat'] = comfy.conds.CONDNoiseShape(data)
adm = self.encode_adm(**kwargs)
if adm is not None:
out['y'] = comfy.conds.CONDRegular(adm)
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
out['c_crossattn'] = comfy.conds.CONDCrossAttn(cross_attn)
cross_attn_cnet = kwargs.get("cross_attn_controlnet", None)
if cross_attn_cnet is not None:
out['crossattn_controlnet'] = comfy.conds.CONDCrossAttn(cross_attn_cnet)
c_concat = kwargs.get("noise_concat", None)
if c_concat is not None:
out['c_concat'] = comfy.conds.CONDNoiseShape(c_concat)
return out
def load_model_weights(self, sd, unet_prefix=""):
to_load = {}
keys = list(sd.keys())
for k in keys:
if k.startswith(unet_prefix):
to_load[k[len(unet_prefix):]] = sd.pop(k)
to_load = self.model_config.process_unet_state_dict(to_load)
m, u = self.diffusion_model.load_state_dict(to_load, strict=False)
if len(m) > 0:
logging.warning("unet missing: {}".format(m))
if len(u) > 0:
logging.warning("unet unexpected: {}".format(u))
del to_load
return self
def process_latent_in(self, latent):
return self.latent_format.process_in(latent)
def process_latent_out(self, latent):
return self.latent_format.process_out(latent)
def state_dict_for_saving(self, clip_state_dict=None, vae_state_dict=None, clip_vision_state_dict=None):
extra_sds = []
if clip_state_dict is not None:
extra_sds.append(self.model_config.process_clip_state_dict_for_saving(clip_state_dict))
if vae_state_dict is not None:
extra_sds.append(self.model_config.process_vae_state_dict_for_saving(vae_state_dict))
if clip_vision_state_dict is not None:
extra_sds.append(self.model_config.process_clip_vision_state_dict_for_saving(clip_vision_state_dict))
unet_state_dict = self.diffusion_model.state_dict()
unet_state_dict = self.model_config.process_unet_state_dict_for_saving(unet_state_dict)
if self.model_type == ModelType.V_PREDICTION:
unet_state_dict["v_pred"] = torch.tensor([])
for sd in extra_sds:
unet_state_dict.update(sd)
return unet_state_dict
def set_inpaint(self):
self.concat_keys = ("mask", "masked_image")
def blank_inpaint_image_like(latent_image):
blank_image = torch.ones_like(latent_image)
# these are the values for "zero" in pixel space translated to latent space
blank_image[:,0] *= 0.8223
blank_image[:,1] *= -0.6876
blank_image[:,2] *= 0.6364
blank_image[:,3] *= 0.1380
return blank_image
self.blank_inpaint_image_like = blank_inpaint_image_like
def memory_required(self, input_shape):
if comfy.model_management.xformers_enabled() or comfy.model_management.pytorch_attention_flash_attention():
dtype = self.get_dtype()
if self.manual_cast_dtype is not None:
dtype = self.manual_cast_dtype
#TODO: this needs to be tweaked
area = input_shape[0] * math.prod(input_shape[2:])
return (area * comfy.model_management.dtype_size(dtype) / 50) * (1024 * 1024)
else:
#TODO: this formula might be too aggressive since I tweaked the sub-quad and split algorithms to use less memory.
area = input_shape[0] * math.prod(input_shape[2:])
return (area * 0.3) * (1024 * 1024)
def unclip_adm(unclip_conditioning, device, noise_augmentor, noise_augment_merge=0.0, seed=None):
adm_inputs = []
weights = []
noise_aug = []
for unclip_cond in unclip_conditioning:
for adm_cond in unclip_cond["clip_vision_output"].image_embeds:
weight = unclip_cond["strength"]
noise_augment = unclip_cond["noise_augmentation"]
noise_level = round((noise_augmentor.max_noise_level - 1) * noise_augment)
c_adm, noise_level_emb = noise_augmentor(adm_cond.to(device), noise_level=torch.tensor([noise_level], device=device), seed=seed)
adm_out = torch.cat((c_adm, noise_level_emb), 1) * weight
weights.append(weight)
noise_aug.append(noise_augment)
adm_inputs.append(adm_out)
if len(noise_aug) > 1:
adm_out = torch.stack(adm_inputs).sum(0)
noise_augment = noise_augment_merge
noise_level = round((noise_augmentor.max_noise_level - 1) * noise_augment)
c_adm, noise_level_emb = noise_augmentor(adm_out[:, :noise_augmentor.time_embed.dim], noise_level=torch.tensor([noise_level], device=device))
adm_out = torch.cat((c_adm, noise_level_emb), 1)
return adm_out
class SD21UNCLIP(BaseModel):
def __init__(self, model_config, noise_aug_config, model_type=ModelType.V_PREDICTION, device=None):
super().__init__(model_config, model_type, device=device)
self.noise_augmentor = CLIPEmbeddingNoiseAugmentation(**noise_aug_config)
def encode_adm(self, **kwargs):
unclip_conditioning = kwargs.get("unclip_conditioning", None)
device = kwargs["device"]
if unclip_conditioning is None:
return torch.zeros((1, self.adm_channels))
else:
return unclip_adm(unclip_conditioning, device, self.noise_augmentor, kwargs.get("unclip_noise_augment_merge", 0.05), kwargs.get("seed", 0) - 10)
def sdxl_pooled(args, noise_augmentor):
if "unclip_conditioning" in args:
return unclip_adm(args.get("unclip_conditioning", None), args["device"], noise_augmentor, seed=args.get("seed", 0) - 10)[:,:1280]
else:
return args["pooled_output"]
class SDXLRefiner(BaseModel):
def __init__(self, model_config, model_type=ModelType.EPS, device=None):
super().__init__(model_config, model_type, device=device)
self.embedder = Timestep(256)
self.noise_augmentor = CLIPEmbeddingNoiseAugmentation(**{"noise_schedule_config": {"timesteps": 1000, "beta_schedule": "squaredcos_cap_v2"}, "timestep_dim": 1280})
def encode_adm(self, **kwargs):
clip_pooled = sdxl_pooled(kwargs, self.noise_augmentor)
width = kwargs.get("width", 768)
height = kwargs.get("height", 768)
crop_w = kwargs.get("crop_w", 0)
crop_h = kwargs.get("crop_h", 0)
if kwargs.get("prompt_type", "") == "negative":
aesthetic_score = kwargs.get("aesthetic_score", 2.5)
else:
aesthetic_score = kwargs.get("aesthetic_score", 6)
out = []
out.append(self.embedder(torch.Tensor([height])))
out.append(self.embedder(torch.Tensor([width])))
out.append(self.embedder(torch.Tensor([crop_h])))
out.append(self.embedder(torch.Tensor([crop_w])))
out.append(self.embedder(torch.Tensor([aesthetic_score])))
flat = torch.flatten(torch.cat(out)).unsqueeze(dim=0).repeat(clip_pooled.shape[0], 1)
return torch.cat((clip_pooled.to(flat.device), flat), dim=1)
class SDXL(BaseModel):
def __init__(self, model_config, model_type=ModelType.EPS, device=None):
super().__init__(model_config, model_type, device=device)
self.embedder = Timestep(256)
self.noise_augmentor = CLIPEmbeddingNoiseAugmentation(**{"noise_schedule_config": {"timesteps": 1000, "beta_schedule": "squaredcos_cap_v2"}, "timestep_dim": 1280})
def encode_adm(self, **kwargs):
clip_pooled = sdxl_pooled(kwargs, self.noise_augmentor)
width = kwargs.get("width", 768)
height = kwargs.get("height", 768)
crop_w = kwargs.get("crop_w", 0)
crop_h = kwargs.get("crop_h", 0)
target_width = kwargs.get("target_width", width)
target_height = kwargs.get("target_height", height)
out = []
out.append(self.embedder(torch.Tensor([height])))
out.append(self.embedder(torch.Tensor([width])))
out.append(self.embedder(torch.Tensor([crop_h])))
out.append(self.embedder(torch.Tensor([crop_w])))
out.append(self.embedder(torch.Tensor([target_height])))
out.append(self.embedder(torch.Tensor([target_width])))
flat = torch.flatten(torch.cat(out)).unsqueeze(dim=0).repeat(clip_pooled.shape[0], 1)
return torch.cat((clip_pooled.to(flat.device), flat), dim=1)
class SVD_img2vid(BaseModel):
def __init__(self, model_config, model_type=ModelType.V_PREDICTION_EDM, device=None):
super().__init__(model_config, model_type, device=device)
self.embedder = Timestep(256)
def encode_adm(self, **kwargs):
fps_id = kwargs.get("fps", 6) - 1
motion_bucket_id = kwargs.get("motion_bucket_id", 127)
augmentation = kwargs.get("augmentation_level", 0)
out = []
out.append(self.embedder(torch.Tensor([fps_id])))
out.append(self.embedder(torch.Tensor([motion_bucket_id])))
out.append(self.embedder(torch.Tensor([augmentation])))
flat = torch.flatten(torch.cat(out)).unsqueeze(dim=0)
return flat
def extra_conds(self, **kwargs):
out = {}
adm = self.encode_adm(**kwargs)
if adm is not None:
out['y'] = comfy.conds.CONDRegular(adm)
latent_image = kwargs.get("concat_latent_image", None)
noise = kwargs.get("noise", None)
device = kwargs["device"]
if latent_image is None:
latent_image = torch.zeros_like(noise)
if latent_image.shape[1:] != noise.shape[1:]:
latent_image = utils.common_upscale(latent_image, noise.shape[-1], noise.shape[-2], "bilinear", "center")
latent_image = utils.resize_to_batch_size(latent_image, noise.shape[0])
out['c_concat'] = comfy.conds.CONDNoiseShape(latent_image)
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
out['c_crossattn'] = comfy.conds.CONDCrossAttn(cross_attn)
if "time_conditioning" in kwargs:
out["time_context"] = comfy.conds.CONDCrossAttn(kwargs["time_conditioning"])
out['num_video_frames'] = comfy.conds.CONDConstant(noise.shape[0])
return out
class SV3D_u(SVD_img2vid):
def encode_adm(self, **kwargs):
augmentation = kwargs.get("augmentation_level", 0)
out = []
out.append(self.embedder(torch.flatten(torch.Tensor([augmentation]))))
flat = torch.flatten(torch.cat(out)).unsqueeze(dim=0)
return flat
class SV3D_p(SVD_img2vid):
def __init__(self, model_config, model_type=ModelType.V_PREDICTION_EDM, device=None):
super().__init__(model_config, model_type, device=device)
self.embedder_512 = Timestep(512)
def encode_adm(self, **kwargs):
augmentation = kwargs.get("augmentation_level", 0)
elevation = kwargs.get("elevation", 0) #elevation and azimuth are in degrees here
azimuth = kwargs.get("azimuth", 0)
noise = kwargs.get("noise", None)
out = []
out.append(self.embedder(torch.flatten(torch.Tensor([augmentation]))))
out.append(self.embedder_512(torch.deg2rad(torch.fmod(torch.flatten(90 - torch.Tensor([elevation])), 360.0))))
out.append(self.embedder_512(torch.deg2rad(torch.fmod(torch.flatten(torch.Tensor([azimuth])), 360.0))))
out = list(map(lambda a: utils.resize_to_batch_size(a, noise.shape[0]), out))
return torch.cat(out, dim=1)
class Stable_Zero123(BaseModel):
def __init__(self, model_config, model_type=ModelType.EPS, device=None, cc_projection_weight=None, cc_projection_bias=None):
super().__init__(model_config, model_type, device=device)
self.cc_projection = comfy.ops.manual_cast.Linear(cc_projection_weight.shape[1], cc_projection_weight.shape[0], dtype=self.get_dtype(), device=device)
self.cc_projection.weight.copy_(cc_projection_weight)
self.cc_projection.bias.copy_(cc_projection_bias)
def extra_conds(self, **kwargs):
out = {}
latent_image = kwargs.get("concat_latent_image", None)
noise = kwargs.get("noise", None)
if latent_image is None:
latent_image = torch.zeros_like(noise)
if latent_image.shape[1:] != noise.shape[1:]:
latent_image = utils.common_upscale(latent_image, noise.shape[-1], noise.shape[-2], "bilinear", "center")
latent_image = utils.resize_to_batch_size(latent_image, noise.shape[0])
out['c_concat'] = comfy.conds.CONDNoiseShape(latent_image)
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
if cross_attn.shape[-1] != 768:
cross_attn = self.cc_projection(cross_attn)
out['c_crossattn'] = comfy.conds.CONDCrossAttn(cross_attn)
return out
class SD_X4Upscaler(BaseModel):
def __init__(self, model_config, model_type=ModelType.V_PREDICTION, device=None):
super().__init__(model_config, model_type, device=device)
self.noise_augmentor = ImageConcatWithNoiseAugmentation(noise_schedule_config={"linear_start": 0.0001, "linear_end": 0.02}, max_noise_level=350)
def extra_conds(self, **kwargs):
out = {}
image = kwargs.get("concat_image", None)
noise = kwargs.get("noise", None)
noise_augment = kwargs.get("noise_augmentation", 0.0)
device = kwargs["device"]
seed = kwargs["seed"] - 10
noise_level = round((self.noise_augmentor.max_noise_level) * noise_augment)
if image is None:
image = torch.zeros_like(noise)[:,:3]
if image.shape[1:] != noise.shape[1:]:
image = utils.common_upscale(image.to(device), noise.shape[-1], noise.shape[-2], "bilinear", "center")
noise_level = torch.tensor([noise_level], device=device)
if noise_augment > 0:
image, noise_level = self.noise_augmentor(image.to(device), noise_level=noise_level, seed=seed)
image = utils.resize_to_batch_size(image, noise.shape[0])
out['c_concat'] = comfy.conds.CONDNoiseShape(image)
out['y'] = comfy.conds.CONDRegular(noise_level)
return out
class IP2P:
def extra_conds(self, **kwargs):
out = {}
image = kwargs.get("concat_latent_image", None)
noise = kwargs.get("noise", None)
device = kwargs["device"]
if image is None:
image = torch.zeros_like(noise)
if image.shape[1:] != noise.shape[1:]:
image = utils.common_upscale(image.to(device), noise.shape[-1], noise.shape[-2], "bilinear", "center")
image = utils.resize_to_batch_size(image, noise.shape[0])
out['c_concat'] = comfy.conds.CONDNoiseShape(self.process_ip2p_image_in(image))
adm = self.encode_adm(**kwargs)
if adm is not None:
out['y'] = comfy.conds.CONDRegular(adm)
return out
class SD15_instructpix2pix(IP2P, BaseModel):
def __init__(self, model_config, model_type=ModelType.EPS, device=None):
super().__init__(model_config, model_type, device=device)
self.process_ip2p_image_in = lambda image: image
class SDXL_instructpix2pix(IP2P, SDXL):
def __init__(self, model_config, model_type=ModelType.EPS, device=None):
super().__init__(model_config, model_type, device=device)
if model_type == ModelType.V_PREDICTION_EDM:
self.process_ip2p_image_in = lambda image: comfy.latent_formats.SDXL().process_in(image) #cosxl ip2p
else:
self.process_ip2p_image_in = lambda image: image #diffusers ip2p
class StableCascade_C(BaseModel):
def __init__(self, model_config, model_type=ModelType.STABLE_CASCADE, device=None):
super().__init__(model_config, model_type, device=device, unet_model=StageC)
self.diffusion_model.eval().requires_grad_(False)
def extra_conds(self, **kwargs):
out = {}
clip_text_pooled = kwargs["pooled_output"]
if clip_text_pooled is not None:
out['clip_text_pooled'] = comfy.conds.CONDRegular(clip_text_pooled)
if "unclip_conditioning" in kwargs:
embeds = []
for unclip_cond in kwargs["unclip_conditioning"]:
weight = unclip_cond["strength"]
embeds.append(unclip_cond["clip_vision_output"].image_embeds.unsqueeze(0) * weight)
clip_img = torch.cat(embeds, dim=1)
else:
clip_img = torch.zeros((1, 1, 768))
out["clip_img"] = comfy.conds.CONDRegular(clip_img)
out["sca"] = comfy.conds.CONDRegular(torch.zeros((1,)))
out["crp"] = comfy.conds.CONDRegular(torch.zeros((1,)))
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
out['clip_text'] = comfy.conds.CONDCrossAttn(cross_attn)
return out
class StableCascade_B(BaseModel):
def __init__(self, model_config, model_type=ModelType.STABLE_CASCADE, device=None):
super().__init__(model_config, model_type, device=device, unet_model=StageB)
self.diffusion_model.eval().requires_grad_(False)
def extra_conds(self, **kwargs):
out = {}
noise = kwargs.get("noise", None)
clip_text_pooled = kwargs["pooled_output"]
if clip_text_pooled is not None:
out['clip'] = comfy.conds.CONDRegular(clip_text_pooled)
#size of prior doesn't really matter if zeros because it gets resized but I still want it to get batched
prior = kwargs.get("stable_cascade_prior", torch.zeros((1, 16, (noise.shape[2] * 4) // 42, (noise.shape[3] * 4) // 42), dtype=noise.dtype, layout=noise.layout, device=noise.device))
out["effnet"] = comfy.conds.CONDRegular(prior)
out["sca"] = comfy.conds.CONDRegular(torch.zeros((1,)))
return out
class SD3(BaseModel):
def __init__(self, model_config, model_type=ModelType.FLOW, device=None):
super().__init__(model_config, model_type, device=device, unet_model=OpenAISignatureMMDITWrapper)
def encode_adm(self, **kwargs):
return kwargs["pooled_output"]
def extra_conds(self, **kwargs):
out = super().extra_conds(**kwargs)
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
out['c_crossattn'] = comfy.conds.CONDRegular(cross_attn)
return out
def memory_required(self, input_shape):
if comfy.model_management.xformers_enabled() or comfy.model_management.pytorch_attention_flash_attention():
dtype = self.get_dtype()
if self.manual_cast_dtype is not None:
dtype = self.manual_cast_dtype
#TODO: this probably needs to be tweaked
area = input_shape[0] * input_shape[2] * input_shape[3]
return (area * comfy.model_management.dtype_size(dtype) * 0.012) * (1024 * 1024)
else:
area = input_shape[0] * input_shape[2] * input_shape[3]
return (area * 0.3) * (1024 * 1024)
class AuraFlow(BaseModel):
def __init__(self, model_config, model_type=ModelType.FLOW, device=None):
super().__init__(model_config, model_type, device=device, unet_model=comfy.ldm.aura.mmdit.MMDiT)
def extra_conds(self, **kwargs):
out = super().extra_conds(**kwargs)
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
out['c_crossattn'] = comfy.conds.CONDRegular(cross_attn)
return out
class StableAudio1(BaseModel):
def __init__(self, model_config, seconds_start_embedder_weights, seconds_total_embedder_weights, model_type=ModelType.V_PREDICTION_CONTINUOUS, device=None):
super().__init__(model_config, model_type, device=device, unet_model=comfy.ldm.audio.dit.AudioDiffusionTransformer)
self.seconds_start_embedder = comfy.ldm.audio.embedders.NumberConditioner(768, min_val=0, max_val=512)
self.seconds_total_embedder = comfy.ldm.audio.embedders.NumberConditioner(768, min_val=0, max_val=512)
self.seconds_start_embedder.load_state_dict(seconds_start_embedder_weights)
self.seconds_total_embedder.load_state_dict(seconds_total_embedder_weights)
def extra_conds(self, **kwargs):
out = {}
noise = kwargs.get("noise", None)
device = kwargs["device"]
seconds_start = kwargs.get("seconds_start", 0)
seconds_total = kwargs.get("seconds_total", int(noise.shape[-1] / 21.53))
seconds_start_embed = self.seconds_start_embedder([seconds_start])[0].to(device)
seconds_total_embed = self.seconds_total_embedder([seconds_total])[0].to(device)
global_embed = torch.cat([seconds_start_embed, seconds_total_embed], dim=-1).reshape((1, -1))
out['global_embed'] = comfy.conds.CONDRegular(global_embed)
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
cross_attn = torch.cat([cross_attn.to(device), seconds_start_embed.repeat((cross_attn.shape[0], 1, 1)), seconds_total_embed.repeat((cross_attn.shape[0], 1, 1))], dim=1)
out['c_crossattn'] = comfy.conds.CONDRegular(cross_attn)
return out
def state_dict_for_saving(self, clip_state_dict=None, vae_state_dict=None, clip_vision_state_dict=None):
sd = super().state_dict_for_saving(clip_state_dict=clip_state_dict, vae_state_dict=vae_state_dict, clip_vision_state_dict=clip_vision_state_dict)
d = {"conditioner.conditioners.seconds_start.": self.seconds_start_embedder.state_dict(), "conditioner.conditioners.seconds_total.": self.seconds_total_embedder.state_dict()}
for k in d:
s = d[k]
for l in s:
sd["{}{}".format(k, l)] = s[l]
return sd
class HunyuanDiT(BaseModel):
def __init__(self, model_config, model_type=ModelType.V_PREDICTION, device=None):
super().__init__(model_config, model_type, device=device, unet_model=comfy.ldm.hydit.models.HunYuanDiT)
def extra_conds(self, **kwargs):
out = super().extra_conds(**kwargs)
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
out['c_crossattn'] = comfy.conds.CONDRegular(cross_attn)
attention_mask = kwargs.get("attention_mask", None)
if attention_mask is not None:
out['text_embedding_mask'] = comfy.conds.CONDRegular(attention_mask)
conditioning_mt5xl = kwargs.get("conditioning_mt5xl", None)
if conditioning_mt5xl is not None:
out['encoder_hidden_states_t5'] = comfy.conds.CONDRegular(conditioning_mt5xl)
attention_mask_mt5xl = kwargs.get("attention_mask_mt5xl", None)
if attention_mask_mt5xl is not None:
out['text_embedding_mask_t5'] = comfy.conds.CONDRegular(attention_mask_mt5xl)
width = kwargs.get("width", 768)
height = kwargs.get("height", 768)
crop_w = kwargs.get("crop_w", 0)
crop_h = kwargs.get("crop_h", 0)
target_width = kwargs.get("target_width", width)
target_height = kwargs.get("target_height", height)
out['image_meta_size'] = comfy.conds.CONDRegular(torch.FloatTensor([[height, width, target_height, target_width, 0, 0]]))
return out
class Flux(BaseModel):
def __init__(self, model_config, model_type=ModelType.FLUX, device=None):
super().__init__(model_config, model_type, device=device, unet_model=comfy.ldm.flux.model.Flux)
def encode_adm(self, **kwargs):
return kwargs["pooled_output"]
def extra_conds(self, **kwargs):
out = super().extra_conds(**kwargs)
cross_attn = kwargs.get("cross_attn", None)
if cross_attn is not None:
out['c_crossattn'] = comfy.conds.CONDRegular(cross_attn)
out['guidance'] = comfy.conds.CONDRegular(torch.FloatTensor([kwargs.get("guidance", 3.5)]))
return out
def memory_required(self, input_shape):
if comfy.model_management.xformers_enabled() or comfy.model_management.pytorch_attention_flash_attention():
dtype = self.get_dtype()
if self.manual_cast_dtype is not None:
dtype = self.manual_cast_dtype
#TODO: this probably needs to be tweaked
area = input_shape[0] * input_shape[2] * input_shape[3]
return (area * comfy.model_management.dtype_size(dtype) * 0.020) * (1024 * 1024)
else:
area = input_shape[0] * input_shape[2] * input_shape[3]
return (area * 0.3) * (1024 * 1024)

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import comfy.supported_models
import comfy.supported_models_base
import comfy.utils
import math
import logging
import torch
def count_blocks(state_dict_keys, prefix_string):
count = 0
while True:
c = False
for k in state_dict_keys:
if k.startswith(prefix_string.format(count)):
c = True
break
if c == False:
break
count += 1
return count
def calculate_transformer_depth(prefix, state_dict_keys, state_dict):
context_dim = None
use_linear_in_transformer = False
transformer_prefix = prefix + "1.transformer_blocks."
transformer_keys = sorted(list(filter(lambda a: a.startswith(transformer_prefix), state_dict_keys)))
if len(transformer_keys) > 0:
last_transformer_depth = count_blocks(state_dict_keys, transformer_prefix + '{}')
context_dim = state_dict['{}0.attn2.to_k.weight'.format(transformer_prefix)].shape[1]
use_linear_in_transformer = len(state_dict['{}1.proj_in.weight'.format(prefix)].shape) == 2
time_stack = '{}1.time_stack.0.attn1.to_q.weight'.format(prefix) in state_dict or '{}1.time_mix_blocks.0.attn1.to_q.weight'.format(prefix) in state_dict
time_stack_cross = '{}1.time_stack.0.attn2.to_q.weight'.format(prefix) in state_dict or '{}1.time_mix_blocks.0.attn2.to_q.weight'.format(prefix) in state_dict
return last_transformer_depth, context_dim, use_linear_in_transformer, time_stack, time_stack_cross
return None
def detect_unet_config(state_dict, key_prefix):
state_dict_keys = list(state_dict.keys())
if '{}joint_blocks.0.context_block.attn.qkv.weight'.format(key_prefix) in state_dict_keys: #mmdit model
unet_config = {}
unet_config["in_channels"] = state_dict['{}x_embedder.proj.weight'.format(key_prefix)].shape[1]
patch_size = state_dict['{}x_embedder.proj.weight'.format(key_prefix)].shape[2]
unet_config["patch_size"] = patch_size
final_layer = '{}final_layer.linear.weight'.format(key_prefix)
if final_layer in state_dict:
unet_config["out_channels"] = state_dict[final_layer].shape[0] // (patch_size * patch_size)
unet_config["depth"] = state_dict['{}x_embedder.proj.weight'.format(key_prefix)].shape[0] // 64
unet_config["input_size"] = None
y_key = '{}y_embedder.mlp.0.weight'.format(key_prefix)
if y_key in state_dict_keys:
unet_config["adm_in_channels"] = state_dict[y_key].shape[1]
context_key = '{}context_embedder.weight'.format(key_prefix)
if context_key in state_dict_keys:
in_features = state_dict[context_key].shape[1]
out_features = state_dict[context_key].shape[0]
unet_config["context_embedder_config"] = {"target": "torch.nn.Linear", "params": {"in_features": in_features, "out_features": out_features}}
num_patches_key = '{}pos_embed'.format(key_prefix)
if num_patches_key in state_dict_keys:
num_patches = state_dict[num_patches_key].shape[1]
unet_config["num_patches"] = num_patches
unet_config["pos_embed_max_size"] = round(math.sqrt(num_patches))
rms_qk = '{}joint_blocks.0.context_block.attn.ln_q.weight'.format(key_prefix)
if rms_qk in state_dict_keys:
unet_config["qk_norm"] = "rms"
unet_config["pos_embed_scaling_factor"] = None #unused for inference
context_processor = '{}context_processor.layers.0.attn.qkv.weight'.format(key_prefix)
if context_processor in state_dict_keys:
unet_config["context_processor_layers"] = count_blocks(state_dict_keys, '{}context_processor.layers.'.format(key_prefix) + '{}.')
return unet_config
if '{}clf.1.weight'.format(key_prefix) in state_dict_keys: #stable cascade
unet_config = {}
text_mapper_name = '{}clip_txt_mapper.weight'.format(key_prefix)
if text_mapper_name in state_dict_keys:
unet_config['stable_cascade_stage'] = 'c'
w = state_dict[text_mapper_name]
if w.shape[0] == 1536: #stage c lite
unet_config['c_cond'] = 1536
unet_config['c_hidden'] = [1536, 1536]
unet_config['nhead'] = [24, 24]
unet_config['blocks'] = [[4, 12], [12, 4]]
elif w.shape[0] == 2048: #stage c full
unet_config['c_cond'] = 2048
elif '{}clip_mapper.weight'.format(key_prefix) in state_dict_keys:
unet_config['stable_cascade_stage'] = 'b'
w = state_dict['{}down_blocks.1.0.channelwise.0.weight'.format(key_prefix)]
if w.shape[-1] == 640:
unet_config['c_hidden'] = [320, 640, 1280, 1280]
unet_config['nhead'] = [-1, -1, 20, 20]
unet_config['blocks'] = [[2, 6, 28, 6], [6, 28, 6, 2]]
unet_config['block_repeat'] = [[1, 1, 1, 1], [3, 3, 2, 2]]
elif w.shape[-1] == 576: #stage b lite
unet_config['c_hidden'] = [320, 576, 1152, 1152]
unet_config['nhead'] = [-1, 9, 18, 18]
unet_config['blocks'] = [[2, 4, 14, 4], [4, 14, 4, 2]]
unet_config['block_repeat'] = [[1, 1, 1, 1], [2, 2, 2, 2]]
return unet_config
if '{}transformer.rotary_pos_emb.inv_freq'.format(key_prefix) in state_dict_keys: #stable audio dit
unet_config = {}
unet_config["audio_model"] = "dit1.0"
return unet_config
if '{}double_layers.0.attn.w1q.weight'.format(key_prefix) in state_dict_keys: #aura flow dit
unet_config = {}
unet_config["max_seq"] = state_dict['{}positional_encoding'.format(key_prefix)].shape[1]
unet_config["cond_seq_dim"] = state_dict['{}cond_seq_linear.weight'.format(key_prefix)].shape[1]
double_layers = count_blocks(state_dict_keys, '{}double_layers.'.format(key_prefix) + '{}.')
single_layers = count_blocks(state_dict_keys, '{}single_layers.'.format(key_prefix) + '{}.')
unet_config["n_double_layers"] = double_layers
unet_config["n_layers"] = double_layers + single_layers
return unet_config
if '{}mlp_t5.0.weight'.format(key_prefix) in state_dict_keys: #Hunyuan DiT
unet_config = {}
unet_config["image_model"] = "hydit"
unet_config["depth"] = count_blocks(state_dict_keys, '{}blocks.'.format(key_prefix) + '{}.')
unet_config["hidden_size"] = state_dict['{}x_embedder.proj.weight'.format(key_prefix)].shape[0]
if unet_config["hidden_size"] == 1408 and unet_config["depth"] == 40: #DiT-g/2
unet_config["mlp_ratio"] = 4.3637
if state_dict['{}extra_embedder.0.weight'.format(key_prefix)].shape[1] == 3968:
unet_config["size_cond"] = True
unet_config["use_style_cond"] = True
unet_config["image_model"] = "hydit1"
return unet_config
if '{}double_blocks.0.img_attn.norm.key_norm.scale'.format(key_prefix) in state_dict_keys: #Flux
dit_config = {}
dit_config["image_model"] = "flux"
dit_config["in_channels"] = 64
dit_config["vec_in_dim"] = 768
dit_config["context_in_dim"] = 4096
dit_config["hidden_size"] = 3072
dit_config["mlp_ratio"] = 4.0
dit_config["num_heads"] = 24
dit_config["depth"] = 19
dit_config["depth_single_blocks"] = 38
dit_config["axes_dim"] = [16, 56, 56]
dit_config["theta"] = 10000
dit_config["qkv_bias"] = True
dit_config["guidance_embed"] = "{}guidance_in.in_layer.weight".format(key_prefix) in state_dict_keys
return dit_config
if '{}input_blocks.0.0.weight'.format(key_prefix) not in state_dict_keys:
return None
unet_config = {
"use_checkpoint": False,
"image_size": 32,
"use_spatial_transformer": True,
"legacy": False
}
y_input = '{}label_emb.0.0.weight'.format(key_prefix)
if y_input in state_dict_keys:
unet_config["num_classes"] = "sequential"
unet_config["adm_in_channels"] = state_dict[y_input].shape[1]
else:
unet_config["adm_in_channels"] = None
model_channels = state_dict['{}input_blocks.0.0.weight'.format(key_prefix)].shape[0]
in_channels = state_dict['{}input_blocks.0.0.weight'.format(key_prefix)].shape[1]
out_key = '{}out.2.weight'.format(key_prefix)
if out_key in state_dict:
out_channels = state_dict[out_key].shape[0]
else:
out_channels = 4
num_res_blocks = []
channel_mult = []
attention_resolutions = []
transformer_depth = []
transformer_depth_output = []
context_dim = None
use_linear_in_transformer = False
video_model = False
video_model_cross = False
current_res = 1
count = 0
last_res_blocks = 0
last_channel_mult = 0
input_block_count = count_blocks(state_dict_keys, '{}input_blocks'.format(key_prefix) + '.{}.')
for count in range(input_block_count):
prefix = '{}input_blocks.{}.'.format(key_prefix, count)
prefix_output = '{}output_blocks.{}.'.format(key_prefix, input_block_count - count - 1)
block_keys = sorted(list(filter(lambda a: a.startswith(prefix), state_dict_keys)))
if len(block_keys) == 0:
break
block_keys_output = sorted(list(filter(lambda a: a.startswith(prefix_output), state_dict_keys)))
if "{}0.op.weight".format(prefix) in block_keys: #new layer
num_res_blocks.append(last_res_blocks)
channel_mult.append(last_channel_mult)
current_res *= 2
last_res_blocks = 0
last_channel_mult = 0
out = calculate_transformer_depth(prefix_output, state_dict_keys, state_dict)
if out is not None:
transformer_depth_output.append(out[0])
else:
transformer_depth_output.append(0)
else:
res_block_prefix = "{}0.in_layers.0.weight".format(prefix)
if res_block_prefix in block_keys:
last_res_blocks += 1
last_channel_mult = state_dict["{}0.out_layers.3.weight".format(prefix)].shape[0] // model_channels
out = calculate_transformer_depth(prefix, state_dict_keys, state_dict)
if out is not None:
transformer_depth.append(out[0])
if context_dim is None:
context_dim = out[1]
use_linear_in_transformer = out[2]
video_model = out[3]
video_model_cross = out[4]
else:
transformer_depth.append(0)
res_block_prefix = "{}0.in_layers.0.weight".format(prefix_output)
if res_block_prefix in block_keys_output:
out = calculate_transformer_depth(prefix_output, state_dict_keys, state_dict)
if out is not None:
transformer_depth_output.append(out[0])
else:
transformer_depth_output.append(0)
num_res_blocks.append(last_res_blocks)
channel_mult.append(last_channel_mult)
if "{}middle_block.1.proj_in.weight".format(key_prefix) in state_dict_keys:
transformer_depth_middle = count_blocks(state_dict_keys, '{}middle_block.1.transformer_blocks.'.format(key_prefix) + '{}')
elif "{}middle_block.0.in_layers.0.weight".format(key_prefix) in state_dict_keys:
transformer_depth_middle = -1
else:
transformer_depth_middle = -2
unet_config["in_channels"] = in_channels
unet_config["out_channels"] = out_channels
unet_config["model_channels"] = model_channels
unet_config["num_res_blocks"] = num_res_blocks
unet_config["transformer_depth"] = transformer_depth
unet_config["transformer_depth_output"] = transformer_depth_output
unet_config["channel_mult"] = channel_mult
unet_config["transformer_depth_middle"] = transformer_depth_middle
unet_config['use_linear_in_transformer'] = use_linear_in_transformer
unet_config["context_dim"] = context_dim
if video_model:
unet_config["extra_ff_mix_layer"] = True
unet_config["use_spatial_context"] = True
unet_config["merge_strategy"] = "learned_with_images"
unet_config["merge_factor"] = 0.0
unet_config["video_kernel_size"] = [3, 1, 1]
unet_config["use_temporal_resblock"] = True
unet_config["use_temporal_attention"] = True
unet_config["disable_temporal_crossattention"] = not video_model_cross
else:
unet_config["use_temporal_resblock"] = False
unet_config["use_temporal_attention"] = False
return unet_config
def model_config_from_unet_config(unet_config, state_dict=None):
for model_config in comfy.supported_models.models:
if model_config.matches(unet_config, state_dict):
return model_config(unet_config)
logging.error("no match {}".format(unet_config))
return None
def model_config_from_unet(state_dict, unet_key_prefix, use_base_if_no_match=False):
unet_config = detect_unet_config(state_dict, unet_key_prefix)
if unet_config is None:
return None
model_config = model_config_from_unet_config(unet_config, state_dict)
if model_config is None and use_base_if_no_match:
return comfy.supported_models_base.BASE(unet_config)
else:
return model_config
def unet_prefix_from_state_dict(state_dict):
candidates = ["model.diffusion_model.", #ldm/sgm models
"model.model.", #audio models
]
counts = {k: 0 for k in candidates}
for k in state_dict:
for c in candidates:
if k.startswith(c):
counts[c] += 1
break
top = max(counts, key=counts.get)
if counts[top] > 5:
return top
else:
return "model." #aura flow and others
def convert_config(unet_config):
new_config = unet_config.copy()
num_res_blocks = new_config.get("num_res_blocks", None)
channel_mult = new_config.get("channel_mult", None)
if isinstance(num_res_blocks, int):
num_res_blocks = len(channel_mult) * [num_res_blocks]
if "attention_resolutions" in new_config:
attention_resolutions = new_config.pop("attention_resolutions")
transformer_depth = new_config.get("transformer_depth", None)
transformer_depth_middle = new_config.get("transformer_depth_middle", None)
if isinstance(transformer_depth, int):
transformer_depth = len(channel_mult) * [transformer_depth]
if transformer_depth_middle is None:
transformer_depth_middle = transformer_depth[-1]
t_in = []
t_out = []
s = 1
for i in range(len(num_res_blocks)):
res = num_res_blocks[i]
d = 0
if s in attention_resolutions:
d = transformer_depth[i]
t_in += [d] * res
t_out += [d] * (res + 1)
s *= 2
transformer_depth = t_in
transformer_depth_output = t_out
new_config["transformer_depth"] = t_in
new_config["transformer_depth_output"] = t_out
new_config["transformer_depth_middle"] = transformer_depth_middle
new_config["num_res_blocks"] = num_res_blocks
return new_config
def unet_config_from_diffusers_unet(state_dict, dtype=None):
match = {}
transformer_depth = []
attn_res = 1
down_blocks = count_blocks(state_dict, "down_blocks.{}")
for i in range(down_blocks):
attn_blocks = count_blocks(state_dict, "down_blocks.{}.attentions.".format(i) + '{}')
res_blocks = count_blocks(state_dict, "down_blocks.{}.resnets.".format(i) + '{}')
for ab in range(attn_blocks):
transformer_count = count_blocks(state_dict, "down_blocks.{}.attentions.{}.transformer_blocks.".format(i, ab) + '{}')
transformer_depth.append(transformer_count)
if transformer_count > 0:
match["context_dim"] = state_dict["down_blocks.{}.attentions.{}.transformer_blocks.0.attn2.to_k.weight".format(i, ab)].shape[1]
attn_res *= 2
if attn_blocks == 0:
for i in range(res_blocks):
transformer_depth.append(0)
match["transformer_depth"] = transformer_depth
match["model_channels"] = state_dict["conv_in.weight"].shape[0]
match["in_channels"] = state_dict["conv_in.weight"].shape[1]
match["adm_in_channels"] = None
if "class_embedding.linear_1.weight" in state_dict:
match["adm_in_channels"] = state_dict["class_embedding.linear_1.weight"].shape[1]
elif "add_embedding.linear_1.weight" in state_dict:
match["adm_in_channels"] = state_dict["add_embedding.linear_1.weight"].shape[1]
SDXL = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [2, 2, 2], 'transformer_depth': [0, 0, 2, 2, 10, 10], 'channel_mult': [1, 2, 4], 'transformer_depth_middle': 10,
'use_linear_in_transformer': True, 'context_dim': 2048, 'num_head_channels': 64, 'transformer_depth_output': [0, 0, 0, 2, 2, 2, 10, 10, 10],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SDXL_refiner = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2560, 'dtype': dtype, 'in_channels': 4, 'model_channels': 384,
'num_res_blocks': [2, 2, 2, 2], 'transformer_depth': [0, 0, 4, 4, 4, 4, 0, 0], 'channel_mult': [1, 2, 4, 4], 'transformer_depth_middle': 4,
'use_linear_in_transformer': True, 'context_dim': 1280, 'num_head_channels': 64, 'transformer_depth_output': [0, 0, 0, 4, 4, 4, 4, 4, 4, 0, 0, 0],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SD21 = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'adm_in_channels': None, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320, 'num_res_blocks': [2, 2, 2, 2],
'transformer_depth': [1, 1, 1, 1, 1, 1, 0, 0], 'channel_mult': [1, 2, 4, 4], 'transformer_depth_middle': 1, 'use_linear_in_transformer': True,
'context_dim': 1024, 'num_head_channels': 64, 'transformer_depth_output': [1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SD21_uncliph = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2048, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [2, 2, 2, 2], 'transformer_depth': [1, 1, 1, 1, 1, 1, 0, 0], 'channel_mult': [1, 2, 4, 4], 'transformer_depth_middle': 1,
'use_linear_in_transformer': True, 'context_dim': 1024, 'num_head_channels': 64, 'transformer_depth_output': [1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SD21_unclipl = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 1536, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [2, 2, 2, 2], 'transformer_depth': [1, 1, 1, 1, 1, 1, 0, 0], 'channel_mult': [1, 2, 4, 4], 'transformer_depth_middle': 1,
'use_linear_in_transformer': True, 'context_dim': 1024, 'num_head_channels': 64, 'transformer_depth_output': [1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SD15 = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False, 'adm_in_channels': None,
'dtype': dtype, 'in_channels': 4, 'model_channels': 320, 'num_res_blocks': [2, 2, 2, 2], 'transformer_depth': [1, 1, 1, 1, 1, 1, 0, 0],
'channel_mult': [1, 2, 4, 4], 'transformer_depth_middle': 1, 'use_linear_in_transformer': False, 'context_dim': 768, 'num_heads': 8,
'transformer_depth_output': [1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SDXL_mid_cnet = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [2, 2, 2], 'transformer_depth': [0, 0, 0, 0, 1, 1], 'channel_mult': [1, 2, 4], 'transformer_depth_middle': 1,
'use_linear_in_transformer': True, 'context_dim': 2048, 'num_head_channels': 64, 'transformer_depth_output': [0, 0, 0, 0, 0, 0, 1, 1, 1],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SDXL_small_cnet = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [2, 2, 2], 'transformer_depth': [0, 0, 0, 0, 0, 0], 'channel_mult': [1, 2, 4], 'transformer_depth_middle': 0,
'use_linear_in_transformer': True, 'num_head_channels': 64, 'context_dim': 1, 'transformer_depth_output': [0, 0, 0, 0, 0, 0, 0, 0, 0],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SDXL_diffusers_inpaint = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 9, 'model_channels': 320,
'num_res_blocks': [2, 2, 2], 'transformer_depth': [0, 0, 2, 2, 10, 10], 'channel_mult': [1, 2, 4], 'transformer_depth_middle': 10,
'use_linear_in_transformer': True, 'context_dim': 2048, 'num_head_channels': 64, 'transformer_depth_output': [0, 0, 0, 2, 2, 2, 10, 10, 10],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SDXL_diffusers_ip2p = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 8, 'model_channels': 320,
'num_res_blocks': [2, 2, 2], 'transformer_depth': [0, 0, 2, 2, 10, 10], 'channel_mult': [1, 2, 4], 'transformer_depth_middle': 10,
'use_linear_in_transformer': True, 'context_dim': 2048, 'num_head_channels': 64, 'transformer_depth_output': [0, 0, 0, 2, 2, 2, 10, 10, 10],
'use_temporal_attention': False, 'use_temporal_resblock': False}
SSD_1B = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [2, 2, 2], 'transformer_depth': [0, 0, 2, 2, 4, 4], 'transformer_depth_output': [0, 0, 0, 1, 1, 2, 10, 4, 4],
'channel_mult': [1, 2, 4], 'transformer_depth_middle': -1, 'use_linear_in_transformer': True, 'context_dim': 2048, 'num_head_channels': 64,
'use_temporal_attention': False, 'use_temporal_resblock': False}
Segmind_Vega = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [2, 2, 2], 'transformer_depth': [0, 0, 1, 1, 2, 2], 'transformer_depth_output': [0, 0, 0, 1, 1, 1, 2, 2, 2],
'channel_mult': [1, 2, 4], 'transformer_depth_middle': -1, 'use_linear_in_transformer': True, 'context_dim': 2048, 'num_head_channels': 64,
'use_temporal_attention': False, 'use_temporal_resblock': False}
KOALA_700M = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [1, 1, 1], 'transformer_depth': [0, 2, 5], 'transformer_depth_output': [0, 0, 2, 2, 5, 5],
'channel_mult': [1, 2, 4], 'transformer_depth_middle': -2, 'use_linear_in_transformer': True, 'context_dim': 2048, 'num_head_channels': 64,
'use_temporal_attention': False, 'use_temporal_resblock': False}
KOALA_1B = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'num_classes': 'sequential', 'adm_in_channels': 2816, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320,
'num_res_blocks': [1, 1, 1], 'transformer_depth': [0, 2, 6], 'transformer_depth_output': [0, 0, 2, 2, 6, 6],
'channel_mult': [1, 2, 4], 'transformer_depth_middle': 6, 'use_linear_in_transformer': True, 'context_dim': 2048, 'num_head_channels': 64,
'use_temporal_attention': False, 'use_temporal_resblock': False}
SD09_XS = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'adm_in_channels': None, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320, 'num_res_blocks': [1, 1, 1],
'transformer_depth': [1, 1, 1], 'channel_mult': [1, 2, 4], 'transformer_depth_middle': -2, 'use_linear_in_transformer': True,
'context_dim': 1024, 'num_head_channels': 64, 'transformer_depth_output': [1, 1, 1, 1, 1, 1],
'use_temporal_attention': False, 'use_temporal_resblock': False, 'disable_self_attentions': [True, False, False]}
SD_XS = {'use_checkpoint': False, 'image_size': 32, 'out_channels': 4, 'use_spatial_transformer': True, 'legacy': False,
'adm_in_channels': None, 'dtype': dtype, 'in_channels': 4, 'model_channels': 320, 'num_res_blocks': [1, 1, 1],
'transformer_depth': [0, 1, 1], 'channel_mult': [1, 2, 4], 'transformer_depth_middle': -2, 'use_linear_in_transformer': False,
'context_dim': 768, 'num_head_channels': 64, 'transformer_depth_output': [0, 0, 1, 1, 1, 1],
'use_temporal_attention': False, 'use_temporal_resblock': False}
supported_models = [SDXL, SDXL_refiner, SD21, SD15, SD21_uncliph, SD21_unclipl, SDXL_mid_cnet, SDXL_small_cnet, SDXL_diffusers_inpaint, SSD_1B, Segmind_Vega, KOALA_700M, KOALA_1B, SD09_XS, SD_XS, SDXL_diffusers_ip2p]
for unet_config in supported_models:
matches = True
for k in match:
if match[k] != unet_config[k]:
matches = False
break
if matches:
return convert_config(unet_config)
return None
def model_config_from_diffusers_unet(state_dict):
unet_config = unet_config_from_diffusers_unet(state_dict)
if unet_config is not None:
return model_config_from_unet_config(unet_config)
return None
def convert_diffusers_mmdit(state_dict, output_prefix=""):
out_sd = {}
if 'transformer_blocks.0.attn.add_q_proj.weight' in state_dict: #SD3
num_blocks = count_blocks(state_dict, 'transformer_blocks.{}.')
depth = state_dict["pos_embed.proj.weight"].shape[0] // 64
sd_map = comfy.utils.mmdit_to_diffusers({"depth": depth, "num_blocks": num_blocks}, output_prefix=output_prefix)
elif 'joint_transformer_blocks.0.attn.add_k_proj.weight' in state_dict: #AuraFlow
num_joint = count_blocks(state_dict, 'joint_transformer_blocks.{}.')
num_single = count_blocks(state_dict, 'single_transformer_blocks.{}.')
sd_map = comfy.utils.auraflow_to_diffusers({"n_double_layers": num_joint, "n_layers": num_joint + num_single}, output_prefix=output_prefix)
else:
return None
for k in sd_map:
weight = state_dict.get(k, None)
if weight is not None:
t = sd_map[k]
if not isinstance(t, str):
if len(t) > 2:
fun = t[2]
else:
fun = lambda a: a
offset = t[1]
if offset is not None:
old_weight = out_sd.get(t[0], None)
if old_weight is None:
old_weight = torch.empty_like(weight)
old_weight = old_weight.repeat([3] + [1] * (len(old_weight.shape) - 1))
w = old_weight.narrow(offset[0], offset[1], offset[2])
else:
old_weight = weight
w = weight
w[:] = fun(weight)
t = t[0]
out_sd[t] = old_weight
else:
out_sd[t] = weight
state_dict.pop(k)
return out_sd

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import psutil
import logging
from enum import Enum
from comfy.cli_args import args
import torch
import sys
import platform
class VRAMState(Enum):
DISABLED = 0 #No vram present: no need to move models to vram
NO_VRAM = 1 #Very low vram: enable all the options to save vram
LOW_VRAM = 2
NORMAL_VRAM = 3
HIGH_VRAM = 4
SHARED = 5 #No dedicated vram: memory shared between CPU and GPU but models still need to be moved between both.
class CPUState(Enum):
GPU = 0
CPU = 1
MPS = 2
# Determine VRAM State
vram_state = VRAMState.NORMAL_VRAM
set_vram_to = VRAMState.NORMAL_VRAM
cpu_state = CPUState.GPU
total_vram = 0
lowvram_available = True
xpu_available = False
if args.deterministic:
logging.info("Using deterministic algorithms for pytorch")
torch.use_deterministic_algorithms(True, warn_only=True)
directml_enabled = False
if args.directml is not None:
import torch_directml
directml_enabled = True
device_index = args.directml
if device_index < 0:
directml_device = torch_directml.device()
else:
directml_device = torch_directml.device(device_index)
logging.info("Using directml with device: {}".format(torch_directml.device_name(device_index)))
# torch_directml.disable_tiled_resources(True)
lowvram_available = False #TODO: need to find a way to get free memory in directml before this can be enabled by default.
try:
import intel_extension_for_pytorch as ipex
if torch.xpu.is_available():
xpu_available = True
except:
pass
try:
if torch.backends.mps.is_available():
cpu_state = CPUState.MPS
import torch.mps
except:
pass
if args.cpu:
cpu_state = CPUState.CPU
def is_intel_xpu():
global cpu_state
global xpu_available
if cpu_state == CPUState.GPU:
if xpu_available:
return True
return False
def get_torch_device():
global directml_enabled
global cpu_state
if directml_enabled:
global directml_device
return directml_device
if cpu_state == CPUState.MPS:
return torch.device("mps")
if cpu_state == CPUState.CPU:
return torch.device("cpu")
else:
if is_intel_xpu():
return torch.device("xpu", torch.xpu.current_device())
else:
return torch.device(torch.cuda.current_device())
def get_total_memory(dev=None, torch_total_too=False):
global directml_enabled
if dev is None:
dev = get_torch_device()
if hasattr(dev, 'type') and (dev.type == 'cpu' or dev.type == 'mps'):
mem_total = psutil.virtual_memory().total
mem_total_torch = mem_total
else:
if directml_enabled:
mem_total = 1024 * 1024 * 1024 #TODO
mem_total_torch = mem_total
elif is_intel_xpu():
stats = torch.xpu.memory_stats(dev)
mem_reserved = stats['reserved_bytes.all.current']
mem_total_torch = mem_reserved
mem_total = torch.xpu.get_device_properties(dev).total_memory
else:
stats = torch.cuda.memory_stats(dev)
mem_reserved = stats['reserved_bytes.all.current']
_, mem_total_cuda = torch.cuda.mem_get_info(dev)
mem_total_torch = mem_reserved
mem_total = mem_total_cuda
if torch_total_too:
return (mem_total, mem_total_torch)
else:
return mem_total
total_vram = get_total_memory(get_torch_device()) / (1024 * 1024)
total_ram = psutil.virtual_memory().total / (1024 * 1024)
logging.info("Total VRAM {:0.0f} MB, total RAM {:0.0f} MB".format(total_vram, total_ram))
try:
logging.info("pytorch version: {}".format(torch.version.__version__))
except:
pass
try:
OOM_EXCEPTION = torch.cuda.OutOfMemoryError
except:
OOM_EXCEPTION = Exception
XFORMERS_VERSION = ""
XFORMERS_ENABLED_VAE = True
if args.disable_xformers:
XFORMERS_IS_AVAILABLE = False
else:
try:
import xformers
import xformers.ops
XFORMERS_IS_AVAILABLE = True
try:
XFORMERS_IS_AVAILABLE = xformers._has_cpp_library
except:
pass
try:
XFORMERS_VERSION = xformers.version.__version__
logging.info("xformers version: {}".format(XFORMERS_VERSION))
if XFORMERS_VERSION.startswith("0.0.18"):
logging.warning("\nWARNING: This version of xformers has a major bug where you will get black images when generating high resolution images.")
logging.warning("Please downgrade or upgrade xformers to a different version.\n")
XFORMERS_ENABLED_VAE = False
except:
pass
except:
XFORMERS_IS_AVAILABLE = False
def is_nvidia():
global cpu_state
if cpu_state == CPUState.GPU:
if torch.version.cuda:
return True
return False
ENABLE_PYTORCH_ATTENTION = False
if args.use_pytorch_cross_attention:
ENABLE_PYTORCH_ATTENTION = True
XFORMERS_IS_AVAILABLE = False
VAE_DTYPES = [torch.float32]
try:
if is_nvidia():
torch_version = torch.version.__version__
if int(torch_version[0]) >= 2:
if ENABLE_PYTORCH_ATTENTION == False and args.use_split_cross_attention == False and args.use_quad_cross_attention == False:
ENABLE_PYTORCH_ATTENTION = True
if torch.cuda.is_bf16_supported() and torch.cuda.get_device_properties(torch.cuda.current_device()).major >= 8:
VAE_DTYPES = [torch.bfloat16] + VAE_DTYPES
if is_intel_xpu():
if args.use_split_cross_attention == False and args.use_quad_cross_attention == False:
ENABLE_PYTORCH_ATTENTION = True
except:
pass
if is_intel_xpu():
VAE_DTYPES = [torch.bfloat16] + VAE_DTYPES
if args.cpu_vae:
VAE_DTYPES = [torch.float32]
if ENABLE_PYTORCH_ATTENTION:
torch.backends.cuda.enable_math_sdp(True)
torch.backends.cuda.enable_flash_sdp(True)
torch.backends.cuda.enable_mem_efficient_sdp(True)
if args.lowvram:
set_vram_to = VRAMState.LOW_VRAM
lowvram_available = True
elif args.novram:
set_vram_to = VRAMState.NO_VRAM
elif args.highvram or args.gpu_only:
vram_state = VRAMState.HIGH_VRAM
FORCE_FP32 = False
FORCE_FP16 = False
if args.force_fp32:
logging.info("Forcing FP32, if this improves things please report it.")
FORCE_FP32 = True
if args.force_fp16:
logging.info("Forcing FP16.")
FORCE_FP16 = True
if lowvram_available:
if set_vram_to in (VRAMState.LOW_VRAM, VRAMState.NO_VRAM):
vram_state = set_vram_to
if cpu_state != CPUState.GPU:
vram_state = VRAMState.DISABLED
if cpu_state == CPUState.MPS:
vram_state = VRAMState.SHARED
logging.info(f"Set vram state to: {vram_state.name}")
DISABLE_SMART_MEMORY = args.disable_smart_memory
if DISABLE_SMART_MEMORY:
logging.info("Disabling smart memory management")
def get_torch_device_name(device):
if hasattr(device, 'type'):
if device.type == "cuda":
try:
allocator_backend = torch.cuda.get_allocator_backend()
except:
allocator_backend = ""
return "{} {} : {}".format(device, torch.cuda.get_device_name(device), allocator_backend)
else:
return "{}".format(device.type)
elif is_intel_xpu():
return "{} {}".format(device, torch.xpu.get_device_name(device))
else:
return "CUDA {}: {}".format(device, torch.cuda.get_device_name(device))
try:
logging.info("Device: {}".format(get_torch_device_name(get_torch_device())))
except:
logging.warning("Could not pick default device.")
current_loaded_models = []
def module_size(module):
module_mem = 0
sd = module.state_dict()
for k in sd:
t = sd[k]
module_mem += t.nelement() * t.element_size()
return module_mem
class LoadedModel:
def __init__(self, model):
self.model = model
self.device = model.load_device
self.weights_loaded = False
self.real_model = None
self.currently_used = True
def model_memory(self):
return self.model.model_size()
def model_memory_required(self, device):
if device == self.model.current_device:
return 0
else:
return self.model_memory()
def model_load(self, lowvram_model_memory=0, force_patch_weights=False):
patch_model_to = self.device
self.model.model_patches_to(self.device)
self.model.model_patches_to(self.model.model_dtype())
load_weights = not self.weights_loaded
try:
if lowvram_model_memory > 0 and load_weights:
self.real_model = self.model.patch_model_lowvram(device_to=patch_model_to, lowvram_model_memory=lowvram_model_memory, force_patch_weights=force_patch_weights)
else:
self.real_model = self.model.patch_model(device_to=patch_model_to, patch_weights=load_weights)
except Exception as e:
self.model.unpatch_model(self.model.offload_device)
self.model_unload()
raise e
if is_intel_xpu() and not args.disable_ipex_optimize:
self.real_model = ipex.optimize(self.real_model.eval(), graph_mode=True, concat_linear=True)
self.weights_loaded = True
return self.real_model
def should_reload_model(self, force_patch_weights=False):
if force_patch_weights and self.model.lowvram_patch_counter > 0:
return True
return False
def model_unload(self, unpatch_weights=True):
self.model.unpatch_model(self.model.offload_device, unpatch_weights=unpatch_weights)
self.model.model_patches_to(self.model.offload_device)
self.weights_loaded = self.weights_loaded and not unpatch_weights
self.real_model = None
def __eq__(self, other):
return self.model is other.model
def minimum_inference_memory():
return (1024 * 1024 * 1024) * 1.2
def unload_model_clones(model, unload_weights_only=True, force_unload=True):
to_unload = []
for i in range(len(current_loaded_models)):
if model.is_clone(current_loaded_models[i].model):
to_unload = [i] + to_unload
if len(to_unload) == 0:
return True
same_weights = 0
for i in to_unload:
if model.clone_has_same_weights(current_loaded_models[i].model):
same_weights += 1
if same_weights == len(to_unload):
unload_weight = False
else:
unload_weight = True
if not force_unload:
if unload_weights_only and unload_weight == False:
return None
for i in to_unload:
logging.debug("unload clone {} {}".format(i, unload_weight))
current_loaded_models.pop(i).model_unload(unpatch_weights=unload_weight)
return unload_weight
def free_memory(memory_required, device, keep_loaded=[]):
unloaded_model = []
can_unload = []
for i in range(len(current_loaded_models) -1, -1, -1):
shift_model = current_loaded_models[i]
if shift_model.device == device:
if shift_model not in keep_loaded:
can_unload.append((sys.getrefcount(shift_model.model), shift_model.model_memory(), i))
shift_model.currently_used = False
for x in sorted(can_unload):
i = x[-1]
if not DISABLE_SMART_MEMORY:
if get_free_memory(device) > memory_required:
break
current_loaded_models[i].model_unload()
unloaded_model.append(i)
for i in sorted(unloaded_model, reverse=True):
current_loaded_models.pop(i)
if len(unloaded_model) > 0:
soft_empty_cache()
else:
if vram_state != VRAMState.HIGH_VRAM:
mem_free_total, mem_free_torch = get_free_memory(device, torch_free_too=True)
if mem_free_torch > mem_free_total * 0.25:
soft_empty_cache()
def load_models_gpu(models, memory_required=0, force_patch_weights=False, minimum_memory_required=None):
global vram_state
inference_memory = minimum_inference_memory()
extra_mem = max(inference_memory, memory_required)
if minimum_memory_required is None:
minimum_memory_required = extra_mem
else:
minimum_memory_required = max(inference_memory, minimum_memory_required)
models = set(models)
models_to_load = []
models_already_loaded = []
for x in models:
loaded_model = LoadedModel(x)
loaded = None
try:
loaded_model_index = current_loaded_models.index(loaded_model)
except:
loaded_model_index = None
if loaded_model_index is not None:
loaded = current_loaded_models[loaded_model_index]
if loaded.should_reload_model(force_patch_weights=force_patch_weights): #TODO: cleanup this model reload logic
current_loaded_models.pop(loaded_model_index).model_unload(unpatch_weights=True)
loaded = None
else:
loaded.currently_used = True
models_already_loaded.append(loaded)
if loaded is None:
if hasattr(x, "model"):
logging.info(f"Requested to load {x.model.__class__.__name__}")
models_to_load.append(loaded_model)
if len(models_to_load) == 0:
devs = set(map(lambda a: a.device, models_already_loaded))
for d in devs:
if d != torch.device("cpu"):
free_memory(extra_mem, d, models_already_loaded)
return
logging.info(f"Loading {len(models_to_load)} new model{'s' if len(models_to_load) > 1 else ''}")
total_memory_required = {}
for loaded_model in models_to_load:
if unload_model_clones(loaded_model.model, unload_weights_only=True, force_unload=False) == True:#unload clones where the weights are different
total_memory_required[loaded_model.device] = total_memory_required.get(loaded_model.device, 0) + loaded_model.model_memory_required(loaded_model.device)
for device in total_memory_required:
if device != torch.device("cpu"):
free_memory(total_memory_required[device] * 1.3 + extra_mem, device, models_already_loaded)
for loaded_model in models_to_load:
weights_unloaded = unload_model_clones(loaded_model.model, unload_weights_only=False, force_unload=False) #unload the rest of the clones where the weights can stay loaded
if weights_unloaded is not None:
loaded_model.weights_loaded = not weights_unloaded
for loaded_model in models_to_load:
model = loaded_model.model
torch_dev = model.load_device
if is_device_cpu(torch_dev):
vram_set_state = VRAMState.DISABLED
else:
vram_set_state = vram_state
lowvram_model_memory = 0
if lowvram_available and (vram_set_state == VRAMState.LOW_VRAM or vram_set_state == VRAMState.NORMAL_VRAM):
model_size = loaded_model.model_memory_required(torch_dev)
current_free_mem = get_free_memory(torch_dev)
lowvram_model_memory = int(max(64 * (1024 * 1024), (current_free_mem - minimum_memory_required)))
if model_size <= lowvram_model_memory: #only switch to lowvram if really necessary
lowvram_model_memory = 0
if vram_set_state == VRAMState.NO_VRAM:
lowvram_model_memory = 64 * 1024 * 1024
cur_loaded_model = loaded_model.model_load(lowvram_model_memory, force_patch_weights=force_patch_weights)
current_loaded_models.insert(0, loaded_model)
return
def load_model_gpu(model):
return load_models_gpu([model])
def loaded_models(only_currently_used=False):
output = []
for m in current_loaded_models:
if only_currently_used:
if not m.currently_used:
continue
output.append(m.model)
return output
def cleanup_models(keep_clone_weights_loaded=False):
to_delete = []
for i in range(len(current_loaded_models)):
if sys.getrefcount(current_loaded_models[i].model) <= 2:
if not keep_clone_weights_loaded:
to_delete = [i] + to_delete
#TODO: find a less fragile way to do this.
elif sys.getrefcount(current_loaded_models[i].real_model) <= 3: #references from .real_model + the .model
to_delete = [i] + to_delete
for i in to_delete:
x = current_loaded_models.pop(i)
x.model_unload()
del x
def dtype_size(dtype):
dtype_size = 4
if dtype == torch.float16 or dtype == torch.bfloat16:
dtype_size = 2
elif dtype == torch.float32:
dtype_size = 4
else:
try:
dtype_size = dtype.itemsize
except: #Old pytorch doesn't have .itemsize
pass
return dtype_size
def unet_offload_device():
if vram_state == VRAMState.HIGH_VRAM:
return get_torch_device()
else:
return torch.device("cpu")
def unet_inital_load_device(parameters, dtype):
torch_dev = get_torch_device()
if vram_state == VRAMState.HIGH_VRAM:
return torch_dev
cpu_dev = torch.device("cpu")
if DISABLE_SMART_MEMORY:
return cpu_dev
model_size = dtype_size(dtype) * parameters
mem_dev = get_free_memory(torch_dev)
mem_cpu = get_free_memory(cpu_dev)
if mem_dev > mem_cpu and model_size < mem_dev:
return torch_dev
else:
return cpu_dev
def unet_dtype(device=None, model_params=0, supported_dtypes=[torch.float16, torch.bfloat16, torch.float32]):
if args.bf16_unet:
return torch.bfloat16
if args.fp16_unet:
return torch.float16
if args.fp8_e4m3fn_unet:
return torch.float8_e4m3fn
if args.fp8_e5m2_unet:
return torch.float8_e5m2
if should_use_fp16(device=device, model_params=model_params, manual_cast=True):
if torch.float16 in supported_dtypes:
return torch.float16
if should_use_bf16(device, model_params=model_params, manual_cast=True):
if torch.bfloat16 in supported_dtypes:
return torch.bfloat16
return torch.float32
# None means no manual cast
def unet_manual_cast(weight_dtype, inference_device, supported_dtypes=[torch.float16, torch.bfloat16, torch.float32]):
if weight_dtype == torch.float32:
return None
fp16_supported = should_use_fp16(inference_device, prioritize_performance=False)
if fp16_supported and weight_dtype == torch.float16:
return None
bf16_supported = should_use_bf16(inference_device)
if bf16_supported and weight_dtype == torch.bfloat16:
return None
if fp16_supported and torch.float16 in supported_dtypes:
return torch.float16
elif bf16_supported and torch.bfloat16 in supported_dtypes:
return torch.bfloat16
else:
return torch.float32
def text_encoder_offload_device():
if args.gpu_only:
return get_torch_device()
else:
return torch.device("cpu")
def text_encoder_device():
if args.gpu_only:
return get_torch_device()
elif vram_state == VRAMState.HIGH_VRAM or vram_state == VRAMState.NORMAL_VRAM:
if should_use_fp16(prioritize_performance=False):
return get_torch_device()
else:
return torch.device("cpu")
else:
return torch.device("cpu")
def text_encoder_dtype(device=None):
if args.fp8_e4m3fn_text_enc:
return torch.float8_e4m3fn
elif args.fp8_e5m2_text_enc:
return torch.float8_e5m2
elif args.fp16_text_enc:
return torch.float16
elif args.fp32_text_enc:
return torch.float32
if is_device_cpu(device):
return torch.float16
return torch.float16
def intermediate_device():
if args.gpu_only:
return get_torch_device()
else:
return torch.device("cpu")
def vae_device():
if args.cpu_vae:
return torch.device("cpu")
return get_torch_device()
def vae_offload_device():
if args.gpu_only:
return get_torch_device()
else:
return torch.device("cpu")
def vae_dtype(device=None, allowed_dtypes=[]):
global VAE_DTYPES
if args.fp16_vae:
return torch.float16
elif args.bf16_vae:
return torch.bfloat16
elif args.fp32_vae:
return torch.float32
for d in allowed_dtypes:
if d == torch.float16 and should_use_fp16(device, prioritize_performance=False):
return d
if d in VAE_DTYPES:
return d
return VAE_DTYPES[0]
def get_autocast_device(dev):
if hasattr(dev, 'type'):
return dev.type
return "cuda"
def supports_dtype(device, dtype): #TODO
if dtype == torch.float32:
return True
if is_device_cpu(device):
return False
if dtype == torch.float16:
return True
if dtype == torch.bfloat16:
return True
return False
def supports_cast(device, dtype): #TODO
if dtype == torch.float32:
return True
if dtype == torch.float16:
return True
if directml_enabled: #TODO: test this
return False
if dtype == torch.bfloat16:
return True
if is_device_mps(device):
return False
if dtype == torch.float8_e4m3fn:
return True
if dtype == torch.float8_e5m2:
return True
return False
def pick_weight_dtype(dtype, fallback_dtype, device=None):
if dtype is None:
dtype = fallback_dtype
elif dtype_size(dtype) > dtype_size(fallback_dtype):
dtype = fallback_dtype
if not supports_cast(device, dtype):
dtype = fallback_dtype
return dtype
def device_supports_non_blocking(device):
if is_device_mps(device):
return False #pytorch bug? mps doesn't support non blocking
if is_intel_xpu():
return False
if args.deterministic: #TODO: figure out why deterministic breaks non blocking from gpu to cpu (previews)
return False
if directml_enabled:
return False
return True
def device_should_use_non_blocking(device):
if not device_supports_non_blocking(device):
return False
return False
# return True #TODO: figure out why this causes memory issues on Nvidia and possibly others
def force_channels_last():
if args.force_channels_last:
return True
#TODO
return False
def cast_to_device(tensor, device, dtype, copy=False):
device_supports_cast = False
if tensor.dtype == torch.float32 or tensor.dtype == torch.float16:
device_supports_cast = True
elif tensor.dtype == torch.bfloat16:
if hasattr(device, 'type') and device.type.startswith("cuda"):
device_supports_cast = True
elif is_intel_xpu():
device_supports_cast = True
non_blocking = device_should_use_non_blocking(device)
if device_supports_cast:
if copy:
if tensor.device == device:
return tensor.to(dtype, copy=copy, non_blocking=non_blocking)
return tensor.to(device, copy=copy, non_blocking=non_blocking).to(dtype, non_blocking=non_blocking)
else:
return tensor.to(device, non_blocking=non_blocking).to(dtype, non_blocking=non_blocking)
else:
return tensor.to(device, dtype, copy=copy, non_blocking=non_blocking)
def xformers_enabled():
global directml_enabled
global cpu_state
if cpu_state != CPUState.GPU:
return False
if is_intel_xpu():
return False
if directml_enabled:
return False
return XFORMERS_IS_AVAILABLE
def xformers_enabled_vae():
enabled = xformers_enabled()
if not enabled:
return False
return XFORMERS_ENABLED_VAE
def pytorch_attention_enabled():
global ENABLE_PYTORCH_ATTENTION
return ENABLE_PYTORCH_ATTENTION
def pytorch_attention_flash_attention():
global ENABLE_PYTORCH_ATTENTION
if ENABLE_PYTORCH_ATTENTION:
#TODO: more reliable way of checking for flash attention?
if is_nvidia(): #pytorch flash attention only works on Nvidia
return True
if is_intel_xpu():
return True
return False
def force_upcast_attention_dtype():
upcast = args.force_upcast_attention
try:
if platform.mac_ver()[0] in ['14.5']: #black image bug on OSX Sonoma 14.5
upcast = True
except:
pass
if upcast:
return torch.float32
else:
return None
def get_free_memory(dev=None, torch_free_too=False):
global directml_enabled
if dev is None:
dev = get_torch_device()
if hasattr(dev, 'type') and (dev.type == 'cpu' or dev.type == 'mps'):
mem_free_total = psutil.virtual_memory().available
mem_free_torch = mem_free_total
else:
if directml_enabled:
mem_free_total = 1024 * 1024 * 1024 #TODO
mem_free_torch = mem_free_total
elif is_intel_xpu():
stats = torch.xpu.memory_stats(dev)
mem_active = stats['active_bytes.all.current']
mem_reserved = stats['reserved_bytes.all.current']
mem_free_torch = mem_reserved - mem_active
mem_free_xpu = torch.xpu.get_device_properties(dev).total_memory - mem_reserved
mem_free_total = mem_free_xpu + mem_free_torch
else:
stats = torch.cuda.memory_stats(dev)
mem_active = stats['active_bytes.all.current']
mem_reserved = stats['reserved_bytes.all.current']
mem_free_cuda, _ = torch.cuda.mem_get_info(dev)
mem_free_torch = mem_reserved - mem_active
mem_free_total = mem_free_cuda + mem_free_torch
if torch_free_too:
return (mem_free_total, mem_free_torch)
else:
return mem_free_total
def cpu_mode():
global cpu_state
return cpu_state == CPUState.CPU
def mps_mode():
global cpu_state
return cpu_state == CPUState.MPS
def is_device_type(device, type):
if hasattr(device, 'type'):
if (device.type == type):
return True
return False
def is_device_cpu(device):
return is_device_type(device, 'cpu')
def is_device_mps(device):
return is_device_type(device, 'mps')
def is_device_cuda(device):
return is_device_type(device, 'cuda')
def should_use_fp16(device=None, model_params=0, prioritize_performance=True, manual_cast=False):
global directml_enabled
if device is not None:
if is_device_cpu(device):
return False
if FORCE_FP16:
return True
if device is not None:
if is_device_mps(device):
return True
if FORCE_FP32:
return False
if directml_enabled:
return False
if mps_mode():
return True
if cpu_mode():
return False
if is_intel_xpu():
return True
if torch.version.hip:
return True
props = torch.cuda.get_device_properties("cuda")
if props.major >= 8:
return True
if props.major < 6:
return False
fp16_works = False
#FP16 is confirmed working on a 1080 (GP104) but it's a bit slower than FP32 so it should only be enabled
#when the model doesn't actually fit on the card
#TODO: actually test if GP106 and others have the same type of behavior
nvidia_10_series = ["1080", "1070", "titan x", "p3000", "p3200", "p4000", "p4200", "p5000", "p5200", "p6000", "1060", "1050", "p40", "p100", "p6", "p4"]
for x in nvidia_10_series:
if x in props.name.lower():
fp16_works = True
if fp16_works or manual_cast:
free_model_memory = (get_free_memory() * 0.9 - minimum_inference_memory())
if (not prioritize_performance) or model_params * 4 > free_model_memory:
return True
if props.major < 7:
return False
#FP16 is just broken on these cards
nvidia_16_series = ["1660", "1650", "1630", "T500", "T550", "T600", "MX550", "MX450", "CMP 30HX", "T2000", "T1000", "T1200"]
for x in nvidia_16_series:
if x in props.name:
return False
return True
def should_use_bf16(device=None, model_params=0, prioritize_performance=True, manual_cast=False):
if device is not None:
if is_device_cpu(device): #TODO ? bf16 works on CPU but is extremely slow
return False
if device is not None:
if is_device_mps(device):
return True
if FORCE_FP32:
return False
if directml_enabled:
return False
if mps_mode():
return True
if cpu_mode():
return False
if is_intel_xpu():
return True
if device is None:
device = torch.device("cuda")
props = torch.cuda.get_device_properties(device)
if props.major >= 8:
return True
bf16_works = torch.cuda.is_bf16_supported()
if bf16_works or manual_cast:
free_model_memory = (get_free_memory() * 0.9 - minimum_inference_memory())
if (not prioritize_performance) or model_params * 4 > free_model_memory:
return True
return False
def soft_empty_cache(force=False):
global cpu_state
if cpu_state == CPUState.MPS:
torch.mps.empty_cache()
elif is_intel_xpu():
torch.xpu.empty_cache()
elif torch.cuda.is_available():
if force or is_nvidia(): #This seems to make things worse on ROCm so I only do it for cuda
torch.cuda.empty_cache()
torch.cuda.ipc_collect()
def unload_all_models():
free_memory(1e30, get_torch_device())
def resolve_lowvram_weight(weight, model, key): #TODO: remove
print("WARNING: The comfy.model_management.resolve_lowvram_weight function will be removed soon, please stop using it.")
return weight
#TODO: might be cleaner to put this somewhere else
import threading
class InterruptProcessingException(Exception):
pass
interrupt_processing_mutex = threading.RLock()
interrupt_processing = False
def interrupt_current_processing(value=True):
global interrupt_processing
global interrupt_processing_mutex
with interrupt_processing_mutex:
interrupt_processing = value
def processing_interrupted():
global interrupt_processing
global interrupt_processing_mutex
with interrupt_processing_mutex:
return interrupt_processing
def throw_exception_if_processing_interrupted():
global interrupt_processing
global interrupt_processing_mutex
with interrupt_processing_mutex:
if interrupt_processing:
interrupt_processing = False
raise InterruptProcessingException()

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comfy/model_patcher.py Normal file
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import torch
import copy
import inspect
import logging
import uuid
import comfy.utils
import comfy.model_management
from comfy.types import UnetWrapperFunction
def weight_decompose(dora_scale, weight, lora_diff, alpha, strength):
dora_scale = comfy.model_management.cast_to_device(dora_scale, weight.device, torch.float32)
lora_diff *= alpha
weight_calc = weight + lora_diff.type(weight.dtype)
weight_norm = (
weight_calc.transpose(0, 1)
.reshape(weight_calc.shape[1], -1)
.norm(dim=1, keepdim=True)
.reshape(weight_calc.shape[1], *[1] * (weight_calc.dim() - 1))
.transpose(0, 1)
)
weight_calc *= (dora_scale / weight_norm).type(weight.dtype)
if strength != 1.0:
weight_calc -= weight
weight += strength * (weight_calc)
else:
weight[:] = weight_calc
return weight
def set_model_options_patch_replace(model_options, patch, name, block_name, number, transformer_index=None):
to = model_options["transformer_options"].copy()
if "patches_replace" not in to:
to["patches_replace"] = {}
else:
to["patches_replace"] = to["patches_replace"].copy()
if name not in to["patches_replace"]:
to["patches_replace"][name] = {}
else:
to["patches_replace"][name] = to["patches_replace"][name].copy()
if transformer_index is not None:
block = (block_name, number, transformer_index)
else:
block = (block_name, number)
to["patches_replace"][name][block] = patch
model_options["transformer_options"] = to
return model_options
def set_model_options_post_cfg_function(model_options, post_cfg_function, disable_cfg1_optimization=False):
model_options["sampler_post_cfg_function"] = model_options.get("sampler_post_cfg_function", []) + [post_cfg_function]
if disable_cfg1_optimization:
model_options["disable_cfg1_optimization"] = True
return model_options
def set_model_options_pre_cfg_function(model_options, pre_cfg_function, disable_cfg1_optimization=False):
model_options["sampler_pre_cfg_function"] = model_options.get("sampler_pre_cfg_function", []) + [pre_cfg_function]
if disable_cfg1_optimization:
model_options["disable_cfg1_optimization"] = True
return model_options
class ModelPatcher:
def __init__(self, model, load_device, offload_device, size=0, current_device=None, weight_inplace_update=False):
self.size = size
self.model = model
self.patches = {}
self.backup = {}
self.object_patches = {}
self.object_patches_backup = {}
self.model_options = {"transformer_options":{}}
self.model_size()
self.load_device = load_device
self.offload_device = offload_device
if current_device is None:
self.current_device = self.offload_device
else:
self.current_device = current_device
self.weight_inplace_update = weight_inplace_update
self.model_lowvram = False
self.lowvram_patch_counter = 0
self.patches_uuid = uuid.uuid4()
def model_size(self):
if self.size > 0:
return self.size
self.size = comfy.model_management.module_size(self.model)
return self.size
def clone(self):
n = ModelPatcher(self.model, self.load_device, self.offload_device, self.size, self.current_device, weight_inplace_update=self.weight_inplace_update)
n.patches = {}
for k in self.patches:
n.patches[k] = self.patches[k][:]
n.patches_uuid = self.patches_uuid
n.object_patches = self.object_patches.copy()
n.model_options = copy.deepcopy(self.model_options)
n.backup = self.backup
n.object_patches_backup = self.object_patches_backup
return n
def is_clone(self, other):
if hasattr(other, 'model') and self.model is other.model:
return True
return False
def clone_has_same_weights(self, clone):
if not self.is_clone(clone):
return False
if len(self.patches) == 0 and len(clone.patches) == 0:
return True
if self.patches_uuid == clone.patches_uuid:
if len(self.patches) != len(clone.patches):
logging.warning("WARNING: something went wrong, same patch uuid but different length of patches.")
else:
return True
def memory_required(self, input_shape):
return self.model.memory_required(input_shape=input_shape)
def set_model_sampler_cfg_function(self, sampler_cfg_function, disable_cfg1_optimization=False):
if len(inspect.signature(sampler_cfg_function).parameters) == 3:
self.model_options["sampler_cfg_function"] = lambda args: sampler_cfg_function(args["cond"], args["uncond"], args["cond_scale"]) #Old way
else:
self.model_options["sampler_cfg_function"] = sampler_cfg_function
if disable_cfg1_optimization:
self.model_options["disable_cfg1_optimization"] = True
def set_model_sampler_post_cfg_function(self, post_cfg_function, disable_cfg1_optimization=False):
self.model_options = set_model_options_post_cfg_function(self.model_options, post_cfg_function, disable_cfg1_optimization)
def set_model_sampler_pre_cfg_function(self, pre_cfg_function, disable_cfg1_optimization=False):
self.model_options = set_model_options_pre_cfg_function(self.model_options, pre_cfg_function, disable_cfg1_optimization)
def set_model_unet_function_wrapper(self, unet_wrapper_function: UnetWrapperFunction):
self.model_options["model_function_wrapper"] = unet_wrapper_function
def set_model_denoise_mask_function(self, denoise_mask_function):
self.model_options["denoise_mask_function"] = denoise_mask_function
def set_model_patch(self, patch, name):
to = self.model_options["transformer_options"]
if "patches" not in to:
to["patches"] = {}
to["patches"][name] = to["patches"].get(name, []) + [patch]
def set_model_patch_replace(self, patch, name, block_name, number, transformer_index=None):
self.model_options = set_model_options_patch_replace(self.model_options, patch, name, block_name, number, transformer_index=transformer_index)
def set_model_attn1_patch(self, patch):
self.set_model_patch(patch, "attn1_patch")
def set_model_attn2_patch(self, patch):
self.set_model_patch(patch, "attn2_patch")
def set_model_attn1_replace(self, patch, block_name, number, transformer_index=None):
self.set_model_patch_replace(patch, "attn1", block_name, number, transformer_index)
def set_model_attn2_replace(self, patch, block_name, number, transformer_index=None):
self.set_model_patch_replace(patch, "attn2", block_name, number, transformer_index)
def set_model_attn1_output_patch(self, patch):
self.set_model_patch(patch, "attn1_output_patch")
def set_model_attn2_output_patch(self, patch):
self.set_model_patch(patch, "attn2_output_patch")
def set_model_input_block_patch(self, patch):
self.set_model_patch(patch, "input_block_patch")
def set_model_input_block_patch_after_skip(self, patch):
self.set_model_patch(patch, "input_block_patch_after_skip")
def set_model_output_block_patch(self, patch):
self.set_model_patch(patch, "output_block_patch")
def add_object_patch(self, name, obj):
self.object_patches[name] = obj
def get_model_object(self, name):
if name in self.object_patches:
return self.object_patches[name]
else:
if name in self.object_patches_backup:
return self.object_patches_backup[name]
else:
return comfy.utils.get_attr(self.model, name)
def model_patches_to(self, device):
to = self.model_options["transformer_options"]
if "patches" in to:
patches = to["patches"]
for name in patches:
patch_list = patches[name]
for i in range(len(patch_list)):
if hasattr(patch_list[i], "to"):
patch_list[i] = patch_list[i].to(device)
if "patches_replace" in to:
patches = to["patches_replace"]
for name in patches:
patch_list = patches[name]
for k in patch_list:
if hasattr(patch_list[k], "to"):
patch_list[k] = patch_list[k].to(device)
if "model_function_wrapper" in self.model_options:
wrap_func = self.model_options["model_function_wrapper"]
if hasattr(wrap_func, "to"):
self.model_options["model_function_wrapper"] = wrap_func.to(device)
def model_dtype(self):
if hasattr(self.model, "get_dtype"):
return self.model.get_dtype()
def add_patches(self, patches, strength_patch=1.0, strength_model=1.0):
p = set()
model_sd = self.model.state_dict()
for k in patches:
offset = None
function = None
if isinstance(k, str):
key = k
else:
offset = k[1]
key = k[0]
if len(k) > 2:
function = k[2]
if key in model_sd:
p.add(k)
current_patches = self.patches.get(key, [])
current_patches.append((strength_patch, patches[k], strength_model, offset, function))
self.patches[key] = current_patches
self.patches_uuid = uuid.uuid4()
return list(p)
def get_key_patches(self, filter_prefix=None):
comfy.model_management.unload_model_clones(self)
model_sd = self.model_state_dict()
p = {}
for k in model_sd:
if filter_prefix is not None:
if not k.startswith(filter_prefix):
continue
if k in self.patches:
p[k] = [model_sd[k]] + self.patches[k]
else:
p[k] = (model_sd[k],)
return p
def model_state_dict(self, filter_prefix=None):
sd = self.model.state_dict()
keys = list(sd.keys())
if filter_prefix is not None:
for k in keys:
if not k.startswith(filter_prefix):
sd.pop(k)
return sd
def patch_weight_to_device(self, key, device_to=None):
if key not in self.patches:
return
weight = comfy.utils.get_attr(self.model, key)
inplace_update = self.weight_inplace_update
if key not in self.backup:
self.backup[key] = weight.to(device=self.offload_device, copy=inplace_update)
if device_to is not None:
temp_weight = comfy.model_management.cast_to_device(weight, device_to, torch.float32, copy=True)
else:
temp_weight = weight.to(torch.float32, copy=True)
out_weight = self.calculate_weight(self.patches[key], temp_weight, key).to(weight.dtype)
if inplace_update:
comfy.utils.copy_to_param(self.model, key, out_weight)
else:
comfy.utils.set_attr_param(self.model, key, out_weight)
def patch_model(self, device_to=None, patch_weights=True):
for k in self.object_patches:
old = comfy.utils.set_attr(self.model, k, self.object_patches[k])
if k not in self.object_patches_backup:
self.object_patches_backup[k] = old
if patch_weights:
model_sd = self.model_state_dict()
for key in self.patches:
if key not in model_sd:
logging.warning("could not patch. key doesn't exist in model: {}".format(key))
continue
self.patch_weight_to_device(key, device_to)
if device_to is not None:
self.model.to(device_to)
self.current_device = device_to
return self.model
def patch_model_lowvram(self, device_to=None, lowvram_model_memory=0, force_patch_weights=False):
self.patch_model(device_to, patch_weights=False)
logging.info("loading in lowvram mode {}".format(lowvram_model_memory/(1024 * 1024)))
class LowVramPatch:
def __init__(self, key, model_patcher):
self.key = key
self.model_patcher = model_patcher
def __call__(self, weight):
return self.model_patcher.calculate_weight(self.model_patcher.patches[self.key], weight, self.key)
mem_counter = 0
patch_counter = 0
for n, m in self.model.named_modules():
lowvram_weight = False
if hasattr(m, "comfy_cast_weights"):
module_mem = comfy.model_management.module_size(m)
if mem_counter + module_mem >= lowvram_model_memory:
lowvram_weight = True
weight_key = "{}.weight".format(n)
bias_key = "{}.bias".format(n)
if lowvram_weight:
if weight_key in self.patches:
if force_patch_weights:
self.patch_weight_to_device(weight_key)
else:
m.weight_function = LowVramPatch(weight_key, self)
patch_counter += 1
if bias_key in self.patches:
if force_patch_weights:
self.patch_weight_to_device(bias_key)
else:
m.bias_function = LowVramPatch(bias_key, self)
patch_counter += 1
m.prev_comfy_cast_weights = m.comfy_cast_weights
m.comfy_cast_weights = True
else:
if hasattr(m, "weight"):
self.patch_weight_to_device(weight_key, device_to)
self.patch_weight_to_device(bias_key, device_to)
m.to(device_to)
mem_counter += comfy.model_management.module_size(m)
logging.debug("lowvram: loaded module regularly {} {}".format(n, m))
self.model_lowvram = True
self.lowvram_patch_counter = patch_counter
return self.model
def calculate_weight(self, patches, weight, key):
for p in patches:
strength = p[0]
v = p[1]
strength_model = p[2]
offset = p[3]
function = p[4]
if function is None:
function = lambda a: a
old_weight = None
if offset is not None:
old_weight = weight
weight = weight.narrow(offset[0], offset[1], offset[2])
if strength_model != 1.0:
weight *= strength_model
if isinstance(v, list):
v = (self.calculate_weight(v[1:], v[0].clone(), key), )
if len(v) == 1:
patch_type = "diff"
elif len(v) == 2:
patch_type = v[0]
v = v[1]
if patch_type == "diff":
w1 = v[0]
if strength != 0.0:
if w1.shape != weight.shape:
logging.warning("WARNING SHAPE MISMATCH {} WEIGHT NOT MERGED {} != {}".format(key, w1.shape, weight.shape))
else:
weight += function(strength * comfy.model_management.cast_to_device(w1, weight.device, weight.dtype))
elif patch_type == "lora": #lora/locon
mat1 = comfy.model_management.cast_to_device(v[0], weight.device, torch.float32)
mat2 = comfy.model_management.cast_to_device(v[1], weight.device, torch.float32)
dora_scale = v[4]
if v[2] is not None:
alpha = v[2] / mat2.shape[0]
else:
alpha = 1.0
if v[3] is not None:
#locon mid weights, hopefully the math is fine because I didn't properly test it
mat3 = comfy.model_management.cast_to_device(v[3], weight.device, torch.float32)
final_shape = [mat2.shape[1], mat2.shape[0], mat3.shape[2], mat3.shape[3]]
mat2 = torch.mm(mat2.transpose(0, 1).flatten(start_dim=1), mat3.transpose(0, 1).flatten(start_dim=1)).reshape(final_shape).transpose(0, 1)
try:
lora_diff = torch.mm(mat1.flatten(start_dim=1), mat2.flatten(start_dim=1)).reshape(weight.shape)
if dora_scale is not None:
weight = function(weight_decompose(dora_scale, weight, lora_diff, alpha, strength))
else:
weight += function(((strength * alpha) * lora_diff).type(weight.dtype))
except Exception as e:
logging.error("ERROR {} {} {}".format(patch_type, key, e))
elif patch_type == "lokr":
w1 = v[0]
w2 = v[1]
w1_a = v[3]
w1_b = v[4]
w2_a = v[5]
w2_b = v[6]
t2 = v[7]
dora_scale = v[8]
dim = None
if w1 is None:
dim = w1_b.shape[0]
w1 = torch.mm(comfy.model_management.cast_to_device(w1_a, weight.device, torch.float32),
comfy.model_management.cast_to_device(w1_b, weight.device, torch.float32))
else:
w1 = comfy.model_management.cast_to_device(w1, weight.device, torch.float32)
if w2 is None:
dim = w2_b.shape[0]
if t2 is None:
w2 = torch.mm(comfy.model_management.cast_to_device(w2_a, weight.device, torch.float32),
comfy.model_management.cast_to_device(w2_b, weight.device, torch.float32))
else:
w2 = torch.einsum('i j k l, j r, i p -> p r k l',
comfy.model_management.cast_to_device(t2, weight.device, torch.float32),
comfy.model_management.cast_to_device(w2_b, weight.device, torch.float32),
comfy.model_management.cast_to_device(w2_a, weight.device, torch.float32))
else:
w2 = comfy.model_management.cast_to_device(w2, weight.device, torch.float32)
if len(w2.shape) == 4:
w1 = w1.unsqueeze(2).unsqueeze(2)
if v[2] is not None and dim is not None:
alpha = v[2] / dim
else:
alpha = 1.0
try:
lora_diff = torch.kron(w1, w2).reshape(weight.shape)
if dora_scale is not None:
weight = function(weight_decompose(dora_scale, weight, lora_diff, alpha, strength))
else:
weight += function(((strength * alpha) * lora_diff).type(weight.dtype))
except Exception as e:
logging.error("ERROR {} {} {}".format(patch_type, key, e))
elif patch_type == "loha":
w1a = v[0]
w1b = v[1]
if v[2] is not None:
alpha = v[2] / w1b.shape[0]
else:
alpha = 1.0
w2a = v[3]
w2b = v[4]
dora_scale = v[7]
if v[5] is not None: #cp decomposition
t1 = v[5]
t2 = v[6]
m1 = torch.einsum('i j k l, j r, i p -> p r k l',
comfy.model_management.cast_to_device(t1, weight.device, torch.float32),
comfy.model_management.cast_to_device(w1b, weight.device, torch.float32),
comfy.model_management.cast_to_device(w1a, weight.device, torch.float32))
m2 = torch.einsum('i j k l, j r, i p -> p r k l',
comfy.model_management.cast_to_device(t2, weight.device, torch.float32),
comfy.model_management.cast_to_device(w2b, weight.device, torch.float32),
comfy.model_management.cast_to_device(w2a, weight.device, torch.float32))
else:
m1 = torch.mm(comfy.model_management.cast_to_device(w1a, weight.device, torch.float32),
comfy.model_management.cast_to_device(w1b, weight.device, torch.float32))
m2 = torch.mm(comfy.model_management.cast_to_device(w2a, weight.device, torch.float32),
comfy.model_management.cast_to_device(w2b, weight.device, torch.float32))
try:
lora_diff = (m1 * m2).reshape(weight.shape)
if dora_scale is not None:
weight = function(weight_decompose(dora_scale, weight, lora_diff, alpha, strength))
else:
weight += function(((strength * alpha) * lora_diff).type(weight.dtype))
except Exception as e:
logging.error("ERROR {} {} {}".format(patch_type, key, e))
elif patch_type == "glora":
if v[4] is not None:
alpha = v[4] / v[0].shape[0]
else:
alpha = 1.0
dora_scale = v[5]
a1 = comfy.model_management.cast_to_device(v[0].flatten(start_dim=1), weight.device, torch.float32)
a2 = comfy.model_management.cast_to_device(v[1].flatten(start_dim=1), weight.device, torch.float32)
b1 = comfy.model_management.cast_to_device(v[2].flatten(start_dim=1), weight.device, torch.float32)
b2 = comfy.model_management.cast_to_device(v[3].flatten(start_dim=1), weight.device, torch.float32)
try:
lora_diff = (torch.mm(b2, b1) + torch.mm(torch.mm(weight.flatten(start_dim=1), a2), a1)).reshape(weight.shape)
if dora_scale is not None:
weight = function(weight_decompose(dora_scale, weight, lora_diff, alpha, strength))
else:
weight += function(((strength * alpha) * lora_diff).type(weight.dtype))
except Exception as e:
logging.error("ERROR {} {} {}".format(patch_type, key, e))
else:
logging.warning("patch type not recognized {} {}".format(patch_type, key))
if old_weight is not None:
weight = old_weight
return weight
def unpatch_model(self, device_to=None, unpatch_weights=True):
if unpatch_weights:
if self.model_lowvram:
for m in self.model.modules():
if hasattr(m, "prev_comfy_cast_weights"):
m.comfy_cast_weights = m.prev_comfy_cast_weights
del m.prev_comfy_cast_weights
m.weight_function = None
m.bias_function = None
self.model_lowvram = False
self.lowvram_patch_counter = 0
keys = list(self.backup.keys())
if self.weight_inplace_update:
for k in keys:
comfy.utils.copy_to_param(self.model, k, self.backup[k])
else:
for k in keys:
comfy.utils.set_attr_param(self.model, k, self.backup[k])
self.backup.clear()
if device_to is not None:
self.model.to(device_to)
self.current_device = device_to
keys = list(self.object_patches_backup.keys())
for k in keys:
comfy.utils.set_attr(self.model, k, self.object_patches_backup[k])
self.object_patches_backup.clear()

314
comfy/model_sampling.py Normal file
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import torch
from comfy.ldm.modules.diffusionmodules.util import make_beta_schedule
import math
class EPS:
def calculate_input(self, sigma, noise):
sigma = sigma.view(sigma.shape[:1] + (1,) * (noise.ndim - 1))
return noise / (sigma ** 2 + self.sigma_data ** 2) ** 0.5
def calculate_denoised(self, sigma, model_output, model_input):
sigma = sigma.view(sigma.shape[:1] + (1,) * (model_output.ndim - 1))
return model_input - model_output * sigma
def noise_scaling(self, sigma, noise, latent_image, max_denoise=False):
if max_denoise:
noise = noise * torch.sqrt(1.0 + sigma ** 2.0)
else:
noise = noise * sigma
noise += latent_image
return noise
def inverse_noise_scaling(self, sigma, latent):
return latent
class V_PREDICTION(EPS):
def calculate_denoised(self, sigma, model_output, model_input):
sigma = sigma.view(sigma.shape[:1] + (1,) * (model_output.ndim - 1))
return model_input * self.sigma_data ** 2 / (sigma ** 2 + self.sigma_data ** 2) - model_output * sigma * self.sigma_data / (sigma ** 2 + self.sigma_data ** 2) ** 0.5
class EDM(V_PREDICTION):
def calculate_denoised(self, sigma, model_output, model_input):
sigma = sigma.view(sigma.shape[:1] + (1,) * (model_output.ndim - 1))
return model_input * self.sigma_data ** 2 / (sigma ** 2 + self.sigma_data ** 2) + model_output * sigma * self.sigma_data / (sigma ** 2 + self.sigma_data ** 2) ** 0.5
class CONST:
def calculate_input(self, sigma, noise):
return noise
def calculate_denoised(self, sigma, model_output, model_input):
sigma = sigma.view(sigma.shape[:1] + (1,) * (model_output.ndim - 1))
return model_input - model_output * sigma
def noise_scaling(self, sigma, noise, latent_image, max_denoise=False):
return sigma * noise + (1.0 - sigma) * latent_image
def inverse_noise_scaling(self, sigma, latent):
return latent / (1.0 - sigma)
class ModelSamplingDiscrete(torch.nn.Module):
def __init__(self, model_config=None):
super().__init__()
if model_config is not None:
sampling_settings = model_config.sampling_settings
else:
sampling_settings = {}
beta_schedule = sampling_settings.get("beta_schedule", "linear")
linear_start = sampling_settings.get("linear_start", 0.00085)
linear_end = sampling_settings.get("linear_end", 0.012)
timesteps = sampling_settings.get("timesteps", 1000)
self._register_schedule(given_betas=None, beta_schedule=beta_schedule, timesteps=timesteps, linear_start=linear_start, linear_end=linear_end, cosine_s=8e-3)
self.sigma_data = 1.0
def _register_schedule(self, given_betas=None, beta_schedule="linear", timesteps=1000,
linear_start=1e-4, linear_end=2e-2, cosine_s=8e-3):
if given_betas is not None:
betas = given_betas
else:
betas = make_beta_schedule(beta_schedule, timesteps, linear_start=linear_start, linear_end=linear_end, cosine_s=cosine_s)
alphas = 1. - betas
alphas_cumprod = torch.cumprod(alphas, dim=0)
timesteps, = betas.shape
self.num_timesteps = int(timesteps)
self.linear_start = linear_start
self.linear_end = linear_end
# self.register_buffer('betas', torch.tensor(betas, dtype=torch.float32))
# self.register_buffer('alphas_cumprod', torch.tensor(alphas_cumprod, dtype=torch.float32))
# self.register_buffer('alphas_cumprod_prev', torch.tensor(alphas_cumprod_prev, dtype=torch.float32))
sigmas = ((1 - alphas_cumprod) / alphas_cumprod) ** 0.5
self.set_sigmas(sigmas)
def set_sigmas(self, sigmas):
self.register_buffer('sigmas', sigmas.float())
self.register_buffer('log_sigmas', sigmas.log().float())
@property
def sigma_min(self):
return self.sigmas[0]
@property
def sigma_max(self):
return self.sigmas[-1]
def timestep(self, sigma):
log_sigma = sigma.log()
dists = log_sigma.to(self.log_sigmas.device) - self.log_sigmas[:, None]
return dists.abs().argmin(dim=0).view(sigma.shape).to(sigma.device)
def sigma(self, timestep):
t = torch.clamp(timestep.float().to(self.log_sigmas.device), min=0, max=(len(self.sigmas) - 1))
low_idx = t.floor().long()
high_idx = t.ceil().long()
w = t.frac()
log_sigma = (1 - w) * self.log_sigmas[low_idx] + w * self.log_sigmas[high_idx]
return log_sigma.exp().to(timestep.device)
def percent_to_sigma(self, percent):
if percent <= 0.0:
return 999999999.9
if percent >= 1.0:
return 0.0
percent = 1.0 - percent
return self.sigma(torch.tensor(percent * 999.0)).item()
class ModelSamplingDiscreteEDM(ModelSamplingDiscrete):
def timestep(self, sigma):
return 0.25 * sigma.log()
def sigma(self, timestep):
return (timestep / 0.25).exp()
class ModelSamplingContinuousEDM(torch.nn.Module):
def __init__(self, model_config=None):
super().__init__()
if model_config is not None:
sampling_settings = model_config.sampling_settings
else:
sampling_settings = {}
sigma_min = sampling_settings.get("sigma_min", 0.002)
sigma_max = sampling_settings.get("sigma_max", 120.0)
sigma_data = sampling_settings.get("sigma_data", 1.0)
self.set_parameters(sigma_min, sigma_max, sigma_data)
def set_parameters(self, sigma_min, sigma_max, sigma_data):
self.sigma_data = sigma_data
sigmas = torch.linspace(math.log(sigma_min), math.log(sigma_max), 1000).exp()
self.register_buffer('sigmas', sigmas) #for compatibility with some schedulers
self.register_buffer('log_sigmas', sigmas.log())
@property
def sigma_min(self):
return self.sigmas[0]
@property
def sigma_max(self):
return self.sigmas[-1]
def timestep(self, sigma):
return 0.25 * sigma.log()
def sigma(self, timestep):
return (timestep / 0.25).exp()
def percent_to_sigma(self, percent):
if percent <= 0.0:
return 999999999.9
if percent >= 1.0:
return 0.0
percent = 1.0 - percent
log_sigma_min = math.log(self.sigma_min)
return math.exp((math.log(self.sigma_max) - log_sigma_min) * percent + log_sigma_min)
class ModelSamplingContinuousV(ModelSamplingContinuousEDM):
def timestep(self, sigma):
return sigma.atan() / math.pi * 2
def sigma(self, timestep):
return (timestep * math.pi / 2).tan()
def time_snr_shift(alpha, t):
if alpha == 1.0:
return t
return alpha * t / (1 + (alpha - 1) * t)
class ModelSamplingDiscreteFlow(torch.nn.Module):
def __init__(self, model_config=None):
super().__init__()
if model_config is not None:
sampling_settings = model_config.sampling_settings
else:
sampling_settings = {}
self.set_parameters(shift=sampling_settings.get("shift", 1.0), multiplier=sampling_settings.get("multiplier", 1000))
def set_parameters(self, shift=1.0, timesteps=1000, multiplier=1000):
self.shift = shift
self.multiplier = multiplier
ts = self.sigma((torch.arange(1, timesteps + 1, 1) / timesteps) * multiplier)
self.register_buffer('sigmas', ts)
@property
def sigma_min(self):
return self.sigmas[0]
@property
def sigma_max(self):
return self.sigmas[-1]
def timestep(self, sigma):
return sigma * self.multiplier
def sigma(self, timestep):
return time_snr_shift(self.shift, timestep / self.multiplier)
def percent_to_sigma(self, percent):
if percent <= 0.0:
return 1.0
if percent >= 1.0:
return 0.0
return 1.0 - percent
class StableCascadeSampling(ModelSamplingDiscrete):
def __init__(self, model_config=None):
super().__init__()
if model_config is not None:
sampling_settings = model_config.sampling_settings
else:
sampling_settings = {}
self.set_parameters(sampling_settings.get("shift", 1.0))
def set_parameters(self, shift=1.0, cosine_s=8e-3):
self.shift = shift
self.cosine_s = torch.tensor(cosine_s)
self._init_alpha_cumprod = torch.cos(self.cosine_s / (1 + self.cosine_s) * torch.pi * 0.5) ** 2
#This part is just for compatibility with some schedulers in the codebase
self.num_timesteps = 10000
sigmas = torch.empty((self.num_timesteps), dtype=torch.float32)
for x in range(self.num_timesteps):
t = (x + 1) / self.num_timesteps
sigmas[x] = self.sigma(t)
self.set_sigmas(sigmas)
def sigma(self, timestep):
alpha_cumprod = (torch.cos((timestep + self.cosine_s) / (1 + self.cosine_s) * torch.pi * 0.5) ** 2 / self._init_alpha_cumprod)
if self.shift != 1.0:
var = alpha_cumprod
logSNR = (var/(1-var)).log()
logSNR += 2 * torch.log(1.0 / torch.tensor(self.shift))
alpha_cumprod = logSNR.sigmoid()
alpha_cumprod = alpha_cumprod.clamp(0.0001, 0.9999)
return ((1 - alpha_cumprod) / alpha_cumprod) ** 0.5
def timestep(self, sigma):
var = 1 / ((sigma * sigma) + 1)
var = var.clamp(0, 1.0)
s, min_var = self.cosine_s.to(var.device), self._init_alpha_cumprod.to(var.device)
t = (((var * min_var) ** 0.5).acos() / (torch.pi * 0.5)) * (1 + s) - s
return t
def percent_to_sigma(self, percent):
if percent <= 0.0:
return 999999999.9
if percent >= 1.0:
return 0.0
percent = 1.0 - percent
return self.sigma(torch.tensor(percent))
def flux_time_shift(mu: float, sigma: float, t):
return math.exp(mu) / (math.exp(mu) + (1 / t - 1) ** sigma)
class ModelSamplingFlux(torch.nn.Module):
def __init__(self, model_config=None):
super().__init__()
if model_config is not None:
sampling_settings = model_config.sampling_settings
else:
sampling_settings = {}
self.set_parameters(shift=sampling_settings.get("shift", 1.15))
def set_parameters(self, shift=1.15, timesteps=10000):
self.shift = shift
ts = self.sigma((torch.arange(1, timesteps + 1, 1) / timesteps))
self.register_buffer('sigmas', ts)
@property
def sigma_min(self):
return self.sigmas[0]
@property
def sigma_max(self):
return self.sigmas[-1]
def timestep(self, sigma):
return sigma
def sigma(self, timestep):
return flux_time_shift(self.shift, 1.0, timestep)
def percent_to_sigma(self, percent):
if percent <= 0.0:
return 1.0
if percent >= 1.0:
return 0.0
return 1.0 - percent

240
comfy/ops.py Normal file
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"""
This file is part of ComfyUI.
Copyright (C) 2024 Stability AI
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
import torch
import comfy.model_management
def cast_to(weight, dtype=None, device=None, non_blocking=False):
return weight.to(device=device, dtype=dtype, non_blocking=non_blocking)
def cast_to_input(weight, input, non_blocking=False):
return cast_to(weight, input.dtype, input.device, non_blocking=non_blocking)
def cast_bias_weight(s, input=None, dtype=None, device=None):
if input is not None:
if dtype is None:
dtype = input.dtype
if device is None:
device = input.device
bias = None
non_blocking = comfy.model_management.device_should_use_non_blocking(device)
if s.bias is not None:
bias = cast_to(s.bias, dtype, device, non_blocking=non_blocking)
if s.bias_function is not None:
bias = s.bias_function(bias)
weight = cast_to(s.weight, dtype, device, non_blocking=non_blocking)
if s.weight_function is not None:
weight = s.weight_function(weight)
return weight, bias
class CastWeightBiasOp:
comfy_cast_weights = False
weight_function = None
bias_function = None
class disable_weight_init:
class Linear(torch.nn.Linear, CastWeightBiasOp):
def reset_parameters(self):
return None
def forward_comfy_cast_weights(self, input):
weight, bias = cast_bias_weight(self, input)
return torch.nn.functional.linear(input, weight, bias)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
return super().forward(*args, **kwargs)
class Conv1d(torch.nn.Conv1d, CastWeightBiasOp):
def reset_parameters(self):
return None
def forward_comfy_cast_weights(self, input):
weight, bias = cast_bias_weight(self, input)
return self._conv_forward(input, weight, bias)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
return super().forward(*args, **kwargs)
class Conv2d(torch.nn.Conv2d, CastWeightBiasOp):
def reset_parameters(self):
return None
def forward_comfy_cast_weights(self, input):
weight, bias = cast_bias_weight(self, input)
return self._conv_forward(input, weight, bias)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
return super().forward(*args, **kwargs)
class Conv3d(torch.nn.Conv3d, CastWeightBiasOp):
def reset_parameters(self):
return None
def forward_comfy_cast_weights(self, input):
weight, bias = cast_bias_weight(self, input)
return self._conv_forward(input, weight, bias)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
return super().forward(*args, **kwargs)
class GroupNorm(torch.nn.GroupNorm, CastWeightBiasOp):
def reset_parameters(self):
return None
def forward_comfy_cast_weights(self, input):
weight, bias = cast_bias_weight(self, input)
return torch.nn.functional.group_norm(input, self.num_groups, weight, bias, self.eps)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
return super().forward(*args, **kwargs)
class LayerNorm(torch.nn.LayerNorm, CastWeightBiasOp):
def reset_parameters(self):
return None
def forward_comfy_cast_weights(self, input):
if self.weight is not None:
weight, bias = cast_bias_weight(self, input)
else:
weight = None
bias = None
return torch.nn.functional.layer_norm(input, self.normalized_shape, weight, bias, self.eps)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
return super().forward(*args, **kwargs)
class ConvTranspose2d(torch.nn.ConvTranspose2d, CastWeightBiasOp):
def reset_parameters(self):
return None
def forward_comfy_cast_weights(self, input, output_size=None):
num_spatial_dims = 2
output_padding = self._output_padding(
input, output_size, self.stride, self.padding, self.kernel_size,
num_spatial_dims, self.dilation)
weight, bias = cast_bias_weight(self, input)
return torch.nn.functional.conv_transpose2d(
input, weight, bias, self.stride, self.padding,
output_padding, self.groups, self.dilation)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
return super().forward(*args, **kwargs)
class ConvTranspose1d(torch.nn.ConvTranspose1d, CastWeightBiasOp):
def reset_parameters(self):
return None
def forward_comfy_cast_weights(self, input, output_size=None):
num_spatial_dims = 1
output_padding = self._output_padding(
input, output_size, self.stride, self.padding, self.kernel_size,
num_spatial_dims, self.dilation)
weight, bias = cast_bias_weight(self, input)
return torch.nn.functional.conv_transpose1d(
input, weight, bias, self.stride, self.padding,
output_padding, self.groups, self.dilation)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
return super().forward(*args, **kwargs)
class Embedding(torch.nn.Embedding, CastWeightBiasOp):
def reset_parameters(self):
self.bias = None
return None
def forward_comfy_cast_weights(self, input, out_dtype=None):
output_dtype = out_dtype
if self.weight.dtype == torch.float16 or self.weight.dtype == torch.bfloat16:
out_dtype = None
weight, bias = cast_bias_weight(self, device=input.device, dtype=out_dtype)
return torch.nn.functional.embedding(input, weight, self.padding_idx, self.max_norm, self.norm_type, self.scale_grad_by_freq, self.sparse).to(dtype=output_dtype)
def forward(self, *args, **kwargs):
if self.comfy_cast_weights:
return self.forward_comfy_cast_weights(*args, **kwargs)
else:
if "out_dtype" in kwargs:
kwargs.pop("out_dtype")
return super().forward(*args, **kwargs)
@classmethod
def conv_nd(s, dims, *args, **kwargs):
if dims == 2:
return s.Conv2d(*args, **kwargs)
elif dims == 3:
return s.Conv3d(*args, **kwargs)
else:
raise ValueError(f"unsupported dimensions: {dims}")
class manual_cast(disable_weight_init):
class Linear(disable_weight_init.Linear):
comfy_cast_weights = True
class Conv1d(disable_weight_init.Conv1d):
comfy_cast_weights = True
class Conv2d(disable_weight_init.Conv2d):
comfy_cast_weights = True
class Conv3d(disable_weight_init.Conv3d):
comfy_cast_weights = True
class GroupNorm(disable_weight_init.GroupNorm):
comfy_cast_weights = True
class LayerNorm(disable_weight_init.LayerNorm):
comfy_cast_weights = True
class ConvTranspose2d(disable_weight_init.ConvTranspose2d):
comfy_cast_weights = True
class ConvTranspose1d(disable_weight_init.ConvTranspose1d):
comfy_cast_weights = True
class Embedding(disable_weight_init.Embedding):
comfy_cast_weights = True

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args_parsing = False
def enable_args_parsing(enable=True):
global args_parsing
args_parsing = enable

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import torch
import comfy.model_management
import comfy.samplers
import comfy.utils
import numpy as np
import logging
def prepare_noise(latent_image, seed, noise_inds=None):
"""
creates random noise given a latent image and a seed.
optional arg skip can be used to skip and discard x number of noise generations for a given seed
"""
generator = torch.manual_seed(seed)
if noise_inds is None:
return torch.randn(latent_image.size(), dtype=latent_image.dtype, layout=latent_image.layout, generator=generator, device="cpu")
unique_inds, inverse = np.unique(noise_inds, return_inverse=True)
noises = []
for i in range(unique_inds[-1]+1):
noise = torch.randn([1] + list(latent_image.size())[1:], dtype=latent_image.dtype, layout=latent_image.layout, generator=generator, device="cpu")
if i in unique_inds:
noises.append(noise)
noises = [noises[i] for i in inverse]
noises = torch.cat(noises, axis=0)
return noises
def fix_empty_latent_channels(model, latent_image):
latent_channels = model.get_model_object("latent_format").latent_channels #Resize the empty latent image so it has the right number of channels
if latent_channels != latent_image.shape[1] and torch.count_nonzero(latent_image) == 0:
latent_image = comfy.utils.repeat_to_batch_size(latent_image, latent_channels, dim=1)
return latent_image
def prepare_sampling(model, noise_shape, positive, negative, noise_mask):
logging.warning("Warning: comfy.sample.prepare_sampling isn't used anymore and can be removed")
return model, positive, negative, noise_mask, []
def cleanup_additional_models(models):
logging.warning("Warning: comfy.sample.cleanup_additional_models isn't used anymore and can be removed")
def sample(model, noise, steps, cfg, sampler_name, scheduler, positive, negative, latent_image, denoise=1.0, disable_noise=False, start_step=None, last_step=None, force_full_denoise=False, noise_mask=None, sigmas=None, callback=None, disable_pbar=False, seed=None):
sampler = comfy.samplers.KSampler(model, steps=steps, device=model.load_device, sampler=sampler_name, scheduler=scheduler, denoise=denoise, model_options=model.model_options)
samples = sampler.sample(noise, positive, negative, cfg=cfg, latent_image=latent_image, start_step=start_step, last_step=last_step, force_full_denoise=force_full_denoise, denoise_mask=noise_mask, sigmas=sigmas, callback=callback, disable_pbar=disable_pbar, seed=seed)
samples = samples.to(comfy.model_management.intermediate_device())
return samples
def sample_custom(model, noise, cfg, sampler, sigmas, positive, negative, latent_image, noise_mask=None, callback=None, disable_pbar=False, seed=None):
samples = comfy.samplers.sample(model, noise, positive, negative, cfg, model.load_device, sampler, sigmas, model_options=model.model_options, latent_image=latent_image, denoise_mask=noise_mask, callback=callback, disable_pbar=disable_pbar, seed=seed)
samples = samples.to(comfy.model_management.intermediate_device())
return samples

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import torch
import comfy.model_management
import comfy.conds
def prepare_mask(noise_mask, shape, device):
"""ensures noise mask is of proper dimensions"""
noise_mask = torch.nn.functional.interpolate(noise_mask.reshape((-1, 1, noise_mask.shape[-2], noise_mask.shape[-1])), size=(shape[2], shape[3]), mode="bilinear")
noise_mask = torch.cat([noise_mask] * shape[1], dim=1)
noise_mask = comfy.utils.repeat_to_batch_size(noise_mask, shape[0])
noise_mask = noise_mask.to(device)
return noise_mask
def get_models_from_cond(cond, model_type):
models = []
for c in cond:
if model_type in c:
models += [c[model_type]]
return models
def convert_cond(cond):
out = []
for c in cond:
temp = c[1].copy()
model_conds = temp.get("model_conds", {})
if c[0] is not None:
model_conds["c_crossattn"] = comfy.conds.CONDCrossAttn(c[0]) #TODO: remove
temp["cross_attn"] = c[0]
temp["model_conds"] = model_conds
out.append(temp)
return out
def get_additional_models(conds, dtype):
"""loads additional models in conditioning"""
cnets = []
gligen = []
for k in conds:
cnets += get_models_from_cond(conds[k], "control")
gligen += get_models_from_cond(conds[k], "gligen")
control_nets = set(cnets)
inference_memory = 0
control_models = []
for m in control_nets:
control_models += m.get_models()
inference_memory += m.inference_memory_requirements(dtype)
gligen = [x[1] for x in gligen]
models = control_models + gligen
return models, inference_memory
def cleanup_additional_models(models):
"""cleanup additional models that were loaded"""
for m in models:
if hasattr(m, 'cleanup'):
m.cleanup()
def prepare_sampling(model, noise_shape, conds):
device = model.load_device
real_model = None
models, inference_memory = get_additional_models(conds, model.model_dtype())
memory_required = model.memory_required([noise_shape[0] * 2] + list(noise_shape[1:])) + inference_memory
minimum_memory_required = model.memory_required([noise_shape[0]] + list(noise_shape[1:])) + inference_memory
comfy.model_management.load_models_gpu([model] + models, memory_required=memory_required, minimum_memory_required=minimum_memory_required)
real_model = model.model
return real_model, conds, models
def cleanup_models(conds, models):
cleanup_additional_models(models)
control_cleanup = []
for k in conds:
control_cleanup += get_models_from_cond(conds[k], "control")
cleanup_additional_models(set(control_cleanup))

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from .k_diffusion import sampling as k_diffusion_sampling
from .extra_samplers import uni_pc
import torch
import collections
from comfy import model_management
import math
import logging
import comfy.sampler_helpers
import scipy
import numpy
def get_area_and_mult(conds, x_in, timestep_in):
dims = tuple(x_in.shape[2:])
area = None
strength = 1.0
if 'timestep_start' in conds:
timestep_start = conds['timestep_start']
if timestep_in[0] > timestep_start:
return None
if 'timestep_end' in conds:
timestep_end = conds['timestep_end']
if timestep_in[0] < timestep_end:
return None
if 'area' in conds:
area = list(conds['area'])
if 'strength' in conds:
strength = conds['strength']
input_x = x_in
if area is not None:
for i in range(len(dims)):
area[i] = min(input_x.shape[i + 2] - area[len(dims) + i], area[i])
input_x = input_x.narrow(i + 2, area[len(dims) + i], area[i])
if 'mask' in conds:
# Scale the mask to the size of the input
# The mask should have been resized as we began the sampling process
mask_strength = 1.0
if "mask_strength" in conds:
mask_strength = conds["mask_strength"]
mask = conds['mask']
assert(mask.shape[1:] == x_in.shape[2:])
mask = mask[:input_x.shape[0]]
if area is not None:
for i in range(len(dims)):
mask = mask.narrow(i + 1, area[len(dims) + i], area[i])
mask = mask * mask_strength
mask = mask.unsqueeze(1).repeat(input_x.shape[0] // mask.shape[0], input_x.shape[1], 1, 1)
else:
mask = torch.ones_like(input_x)
mult = mask * strength
if 'mask' not in conds and area is not None:
rr = 8
for i in range(len(dims)):
if area[len(dims) + i] != 0:
for t in range(rr):
m = mult.narrow(i + 2, t, 1)
m *= ((1.0/rr) * (t + 1))
if (area[i] + area[len(dims) + i]) < x_in.shape[i + 2]:
for t in range(rr):
m = mult.narrow(i + 2, area[i] - 1 - t, 1)
m *= ((1.0/rr) * (t + 1))
conditioning = {}
model_conds = conds["model_conds"]
for c in model_conds:
conditioning[c] = model_conds[c].process_cond(batch_size=x_in.shape[0], device=x_in.device, area=area)
control = conds.get('control', None)
patches = None
if 'gligen' in conds:
gligen = conds['gligen']
patches = {}
gligen_type = gligen[0]
gligen_model = gligen[1]
if gligen_type == "position":
gligen_patch = gligen_model.model.set_position(input_x.shape, gligen[2], input_x.device)
else:
gligen_patch = gligen_model.model.set_empty(input_x.shape, input_x.device)
patches['middle_patch'] = [gligen_patch]
cond_obj = collections.namedtuple('cond_obj', ['input_x', 'mult', 'conditioning', 'area', 'control', 'patches'])
return cond_obj(input_x, mult, conditioning, area, control, patches)
def cond_equal_size(c1, c2):
if c1 is c2:
return True
if c1.keys() != c2.keys():
return False
for k in c1:
if not c1[k].can_concat(c2[k]):
return False
return True
def can_concat_cond(c1, c2):
if c1.input_x.shape != c2.input_x.shape:
return False
def objects_concatable(obj1, obj2):
if (obj1 is None) != (obj2 is None):
return False
if obj1 is not None:
if obj1 is not obj2:
return False
return True
if not objects_concatable(c1.control, c2.control):
return False
if not objects_concatable(c1.patches, c2.patches):
return False
return cond_equal_size(c1.conditioning, c2.conditioning)
def cond_cat(c_list):
c_crossattn = []
c_concat = []
c_adm = []
crossattn_max_len = 0
temp = {}
for x in c_list:
for k in x:
cur = temp.get(k, [])
cur.append(x[k])
temp[k] = cur
out = {}
for k in temp:
conds = temp[k]
out[k] = conds[0].concat(conds[1:])
return out
def calc_cond_batch(model, conds, x_in, timestep, model_options):
out_conds = []
out_counts = []
to_run = []
for i in range(len(conds)):
out_conds.append(torch.zeros_like(x_in))
out_counts.append(torch.ones_like(x_in) * 1e-37)
cond = conds[i]
if cond is not None:
for x in cond:
p = get_area_and_mult(x, x_in, timestep)
if p is None:
continue
to_run += [(p, i)]
while len(to_run) > 0:
first = to_run[0]
first_shape = first[0][0].shape
to_batch_temp = []
for x in range(len(to_run)):
if can_concat_cond(to_run[x][0], first[0]):
to_batch_temp += [x]
to_batch_temp.reverse()
to_batch = to_batch_temp[:1]
free_memory = model_management.get_free_memory(x_in.device)
for i in range(1, len(to_batch_temp) + 1):
batch_amount = to_batch_temp[:len(to_batch_temp)//i]
input_shape = [len(batch_amount) * first_shape[0]] + list(first_shape)[1:]
if model.memory_required(input_shape) < free_memory:
to_batch = batch_amount
break
input_x = []
mult = []
c = []
cond_or_uncond = []
area = []
control = None
patches = None
for x in to_batch:
o = to_run.pop(x)
p = o[0]
input_x.append(p.input_x)
mult.append(p.mult)
c.append(p.conditioning)
area.append(p.area)
cond_or_uncond.append(o[1])
control = p.control
patches = p.patches
batch_chunks = len(cond_or_uncond)
input_x = torch.cat(input_x)
c = cond_cat(c)
timestep_ = torch.cat([timestep] * batch_chunks)
if control is not None:
c['control'] = control.get_control(input_x, timestep_, c, len(cond_or_uncond))
transformer_options = {}
if 'transformer_options' in model_options:
transformer_options = model_options['transformer_options'].copy()
if patches is not None:
if "patches" in transformer_options:
cur_patches = transformer_options["patches"].copy()
for p in patches:
if p in cur_patches:
cur_patches[p] = cur_patches[p] + patches[p]
else:
cur_patches[p] = patches[p]
transformer_options["patches"] = cur_patches
else:
transformer_options["patches"] = patches
transformer_options["cond_or_uncond"] = cond_or_uncond[:]
transformer_options["sigmas"] = timestep
c['transformer_options'] = transformer_options
if 'model_function_wrapper' in model_options:
output = model_options['model_function_wrapper'](model.apply_model, {"input": input_x, "timestep": timestep_, "c": c, "cond_or_uncond": cond_or_uncond}).chunk(batch_chunks)
else:
output = model.apply_model(input_x, timestep_, **c).chunk(batch_chunks)
for o in range(batch_chunks):
cond_index = cond_or_uncond[o]
a = area[o]
if a is None:
out_conds[cond_index] += output[o] * mult[o]
out_counts[cond_index] += mult[o]
else:
out_c = out_conds[cond_index]
out_cts = out_counts[cond_index]
dims = len(a) // 2
for i in range(dims):
out_c = out_c.narrow(i + 2, a[i + dims], a[i])
out_cts = out_cts.narrow(i + 2, a[i + dims], a[i])
out_c += output[o] * mult[o]
out_cts += mult[o]
for i in range(len(out_conds)):
out_conds[i] /= out_counts[i]
return out_conds
def calc_cond_uncond_batch(model, cond, uncond, x_in, timestep, model_options): #TODO: remove
logging.warning("WARNING: The comfy.samplers.calc_cond_uncond_batch function is deprecated please use the calc_cond_batch one instead.")
return tuple(calc_cond_batch(model, [cond, uncond], x_in, timestep, model_options))
def cfg_function(model, cond_pred, uncond_pred, cond_scale, x, timestep, model_options={}, cond=None, uncond=None):
if "sampler_cfg_function" in model_options:
args = {"cond": x - cond_pred, "uncond": x - uncond_pred, "cond_scale": cond_scale, "timestep": timestep, "input": x, "sigma": timestep,
"cond_denoised": cond_pred, "uncond_denoised": uncond_pred, "model": model, "model_options": model_options}
cfg_result = x - model_options["sampler_cfg_function"](args)
else:
cfg_result = uncond_pred + (cond_pred - uncond_pred) * cond_scale
for fn in model_options.get("sampler_post_cfg_function", []):
args = {"denoised": cfg_result, "cond": cond, "uncond": uncond, "model": model, "uncond_denoised": uncond_pred, "cond_denoised": cond_pred,
"sigma": timestep, "model_options": model_options, "input": x}
cfg_result = fn(args)
return cfg_result
#The main sampling function shared by all the samplers
#Returns denoised
def sampling_function(model, x, timestep, uncond, cond, cond_scale, model_options={}, seed=None):
if math.isclose(cond_scale, 1.0) and model_options.get("disable_cfg1_optimization", False) == False:
uncond_ = None
else:
uncond_ = uncond
conds = [cond, uncond_]
out = calc_cond_batch(model, conds, x, timestep, model_options)
for fn in model_options.get("sampler_pre_cfg_function", []):
args = {"conds":conds, "conds_out": out, "cond_scale": cond_scale, "timestep": timestep,
"input": x, "sigma": timestep, "model": model, "model_options": model_options}
out = fn(args)
return cfg_function(model, out[0], out[1], cond_scale, x, timestep, model_options=model_options, cond=cond, uncond=uncond_)
class KSamplerX0Inpaint:
def __init__(self, model, sigmas):
self.inner_model = model
self.sigmas = sigmas
def __call__(self, x, sigma, denoise_mask, model_options={}, seed=None):
if denoise_mask is not None:
if "denoise_mask_function" in model_options:
denoise_mask = model_options["denoise_mask_function"](sigma, denoise_mask, extra_options={"model": self.inner_model, "sigmas": self.sigmas})
latent_mask = 1. - denoise_mask
x = x * denoise_mask + self.inner_model.inner_model.model_sampling.noise_scaling(sigma.reshape([sigma.shape[0]] + [1] * (len(self.noise.shape) - 1)), self.noise, self.latent_image) * latent_mask
out = self.inner_model(x, sigma, model_options=model_options, seed=seed)
if denoise_mask is not None:
out = out * denoise_mask + self.latent_image * latent_mask
return out
def simple_scheduler(model_sampling, steps):
s = model_sampling
sigs = []
ss = len(s.sigmas) / steps
for x in range(steps):
sigs += [float(s.sigmas[-(1 + int(x * ss))])]
sigs += [0.0]
return torch.FloatTensor(sigs)
def ddim_scheduler(model_sampling, steps):
s = model_sampling
sigs = []
x = 1
if math.isclose(float(s.sigmas[x]), 0, abs_tol=0.00001):
steps += 1
sigs = []
else:
sigs = [0.0]
ss = max(len(s.sigmas) // steps, 1)
while x < len(s.sigmas):
sigs += [float(s.sigmas[x])]
x += ss
sigs = sigs[::-1]
return torch.FloatTensor(sigs)
def normal_scheduler(model_sampling, steps, sgm=False, floor=False):
s = model_sampling
start = s.timestep(s.sigma_max)
end = s.timestep(s.sigma_min)
append_zero = True
if sgm:
timesteps = torch.linspace(start, end, steps + 1)[:-1]
else:
if math.isclose(float(s.sigma(end)), 0, abs_tol=0.00001):
steps += 1
append_zero = False
timesteps = torch.linspace(start, end, steps)
sigs = []
for x in range(len(timesteps)):
ts = timesteps[x]
sigs.append(float(s.sigma(ts)))
if append_zero:
sigs += [0.0]
return torch.FloatTensor(sigs)
# Implemented based on: https://arxiv.org/abs/2407.12173
def beta_scheduler(model_sampling, steps, alpha=0.6, beta=0.6):
total_timesteps = (len(model_sampling.sigmas) - 1)
ts = 1 - numpy.linspace(0, 1, steps, endpoint=False)
ts = numpy.rint(scipy.stats.beta.ppf(ts, alpha, beta) * total_timesteps)
sigs = []
for t in ts:
sigs += [float(model_sampling.sigmas[int(t)])]
sigs += [0.0]
return torch.FloatTensor(sigs)
def get_mask_aabb(masks):
if masks.numel() == 0:
return torch.zeros((0, 4), device=masks.device, dtype=torch.int)
b = masks.shape[0]
bounding_boxes = torch.zeros((b, 4), device=masks.device, dtype=torch.int)
is_empty = torch.zeros((b), device=masks.device, dtype=torch.bool)
for i in range(b):
mask = masks[i]
if mask.numel() == 0:
continue
if torch.max(mask != 0) == False:
is_empty[i] = True
continue
y, x = torch.where(mask)
bounding_boxes[i, 0] = torch.min(x)
bounding_boxes[i, 1] = torch.min(y)
bounding_boxes[i, 2] = torch.max(x)
bounding_boxes[i, 3] = torch.max(y)
return bounding_boxes, is_empty
def resolve_areas_and_cond_masks_multidim(conditions, dims, device):
# We need to decide on an area outside the sampling loop in order to properly generate opposite areas of equal sizes.
# While we're doing this, we can also resolve the mask device and scaling for performance reasons
for i in range(len(conditions)):
c = conditions[i]
if 'area' in c:
area = c['area']
if area[0] == "percentage":
modified = c.copy()
a = area[1:]
a_len = len(a) // 2
area = ()
for d in range(len(dims)):
area += (max(1, round(a[d] * dims[d])),)
for d in range(len(dims)):
area += (round(a[d + a_len] * dims[d]),)
modified['area'] = area
c = modified
conditions[i] = c
if 'mask' in c:
mask = c['mask']
mask = mask.to(device=device)
modified = c.copy()
if len(mask.shape) == len(dims):
mask = mask.unsqueeze(0)
if mask.shape[1:] != dims:
mask = torch.nn.functional.interpolate(mask.unsqueeze(1), size=dims, mode='bilinear', align_corners=False).squeeze(1)
if modified.get("set_area_to_bounds", False): #TODO: handle dim != 2
bounds = torch.max(torch.abs(mask),dim=0).values.unsqueeze(0)
boxes, is_empty = get_mask_aabb(bounds)
if is_empty[0]:
# Use the minimum possible size for efficiency reasons. (Since the mask is all-0, this becomes a noop anyway)
modified['area'] = (8, 8, 0, 0)
else:
box = boxes[0]
H, W, Y, X = (box[3] - box[1] + 1, box[2] - box[0] + 1, box[1], box[0])
H = max(8, H)
W = max(8, W)
area = (int(H), int(W), int(Y), int(X))
modified['area'] = area
modified['mask'] = mask
conditions[i] = modified
def resolve_areas_and_cond_masks(conditions, h, w, device):
logging.warning("WARNING: The comfy.samplers.resolve_areas_and_cond_masks function is deprecated please use the resolve_areas_and_cond_masks_multidim one instead.")
return resolve_areas_and_cond_masks_multidim(conditions, [h, w], device)
def create_cond_with_same_area_if_none(conds, c): #TODO: handle dim != 2
if 'area' not in c:
return
c_area = c['area']
smallest = None
for x in conds:
if 'area' in x:
a = x['area']
if c_area[2] >= a[2] and c_area[3] >= a[3]:
if a[0] + a[2] >= c_area[0] + c_area[2]:
if a[1] + a[3] >= c_area[1] + c_area[3]:
if smallest is None:
smallest = x
elif 'area' not in smallest:
smallest = x
else:
if smallest['area'][0] * smallest['area'][1] > a[0] * a[1]:
smallest = x
else:
if smallest is None:
smallest = x
if smallest is None:
return
if 'area' in smallest:
if smallest['area'] == c_area:
return
out = c.copy()
out['model_conds'] = smallest['model_conds'].copy() #TODO: which fields should be copied?
conds += [out]
def calculate_start_end_timesteps(model, conds):
s = model.model_sampling
for t in range(len(conds)):
x = conds[t]
timestep_start = None
timestep_end = None
if 'start_percent' in x:
timestep_start = s.percent_to_sigma(x['start_percent'])
if 'end_percent' in x:
timestep_end = s.percent_to_sigma(x['end_percent'])
if (timestep_start is not None) or (timestep_end is not None):
n = x.copy()
if (timestep_start is not None):
n['timestep_start'] = timestep_start
if (timestep_end is not None):
n['timestep_end'] = timestep_end
conds[t] = n
def pre_run_control(model, conds):
s = model.model_sampling
for t in range(len(conds)):
x = conds[t]
timestep_start = None
timestep_end = None
percent_to_timestep_function = lambda a: s.percent_to_sigma(a)
if 'control' in x:
x['control'].pre_run(model, percent_to_timestep_function)
def apply_empty_x_to_equal_area(conds, uncond, name, uncond_fill_func):
cond_cnets = []
cond_other = []
uncond_cnets = []
uncond_other = []
for t in range(len(conds)):
x = conds[t]
if 'area' not in x:
if name in x and x[name] is not None:
cond_cnets.append(x[name])
else:
cond_other.append((x, t))
for t in range(len(uncond)):
x = uncond[t]
if 'area' not in x:
if name in x and x[name] is not None:
uncond_cnets.append(x[name])
else:
uncond_other.append((x, t))
if len(uncond_cnets) > 0:
return
for x in range(len(cond_cnets)):
temp = uncond_other[x % len(uncond_other)]
o = temp[0]
if name in o and o[name] is not None:
n = o.copy()
n[name] = uncond_fill_func(cond_cnets, x)
uncond += [n]
else:
n = o.copy()
n[name] = uncond_fill_func(cond_cnets, x)
uncond[temp[1]] = n
def encode_model_conds(model_function, conds, noise, device, prompt_type, **kwargs):
for t in range(len(conds)):
x = conds[t]
params = x.copy()
params["device"] = device
params["noise"] = noise
default_width = None
if len(noise.shape) >= 4: #TODO: 8 multiple should be set by the model
default_width = noise.shape[3] * 8
params["width"] = params.get("width", default_width)
params["height"] = params.get("height", noise.shape[2] * 8)
params["prompt_type"] = params.get("prompt_type", prompt_type)
for k in kwargs:
if k not in params:
params[k] = kwargs[k]
out = model_function(**params)
x = x.copy()
model_conds = x['model_conds'].copy()
for k in out:
model_conds[k] = out[k]
x['model_conds'] = model_conds
conds[t] = x
return conds
class Sampler:
def sample(self):
pass
def max_denoise(self, model_wrap, sigmas):
max_sigma = float(model_wrap.inner_model.model_sampling.sigma_max)
sigma = float(sigmas[0])
return math.isclose(max_sigma, sigma, rel_tol=1e-05) or sigma > max_sigma
KSAMPLER_NAMES = ["euler", "euler_cfg_pp", "euler_ancestral", "euler_ancestral_cfg_pp", "heun", "heunpp2","dpm_2", "dpm_2_ancestral",
"lms", "dpm_fast", "dpm_adaptive", "dpmpp_2s_ancestral", "dpmpp_sde", "dpmpp_sde_gpu",
"dpmpp_2m", "dpmpp_2m_sde", "dpmpp_2m_sde_gpu", "dpmpp_3m_sde", "dpmpp_3m_sde_gpu", "ddpm", "lcm",
"ipndm", "ipndm_v", "deis"]
class KSAMPLER(Sampler):
def __init__(self, sampler_function, extra_options={}, inpaint_options={}):
self.sampler_function = sampler_function
self.extra_options = extra_options
self.inpaint_options = inpaint_options
def sample(self, model_wrap, sigmas, extra_args, callback, noise, latent_image=None, denoise_mask=None, disable_pbar=False):
extra_args["denoise_mask"] = denoise_mask
model_k = KSamplerX0Inpaint(model_wrap, sigmas)
model_k.latent_image = latent_image
if self.inpaint_options.get("random", False): #TODO: Should this be the default?
generator = torch.manual_seed(extra_args.get("seed", 41) + 1)
model_k.noise = torch.randn(noise.shape, generator=generator, device="cpu").to(noise.dtype).to(noise.device)
else:
model_k.noise = noise
noise = model_wrap.inner_model.model_sampling.noise_scaling(sigmas[0], noise, latent_image, self.max_denoise(model_wrap, sigmas))
k_callback = None
total_steps = len(sigmas) - 1
if callback is not None:
k_callback = lambda x: callback(x["i"], x["denoised"], x["x"], total_steps)
samples = self.sampler_function(model_k, noise, sigmas, extra_args=extra_args, callback=k_callback, disable=disable_pbar, **self.extra_options)
samples = model_wrap.inner_model.model_sampling.inverse_noise_scaling(sigmas[-1], samples)
return samples
def ksampler(sampler_name, extra_options={}, inpaint_options={}):
if sampler_name == "dpm_fast":
def dpm_fast_function(model, noise, sigmas, extra_args, callback, disable):
if len(sigmas) <= 1:
return noise
sigma_min = sigmas[-1]
if sigma_min == 0:
sigma_min = sigmas[-2]
total_steps = len(sigmas) - 1
return k_diffusion_sampling.sample_dpm_fast(model, noise, sigma_min, sigmas[0], total_steps, extra_args=extra_args, callback=callback, disable=disable)
sampler_function = dpm_fast_function
elif sampler_name == "dpm_adaptive":
def dpm_adaptive_function(model, noise, sigmas, extra_args, callback, disable, **extra_options):
if len(sigmas) <= 1:
return noise
sigma_min = sigmas[-1]
if sigma_min == 0:
sigma_min = sigmas[-2]
return k_diffusion_sampling.sample_dpm_adaptive(model, noise, sigma_min, sigmas[0], extra_args=extra_args, callback=callback, disable=disable, **extra_options)
sampler_function = dpm_adaptive_function
else:
sampler_function = getattr(k_diffusion_sampling, "sample_{}".format(sampler_name))
return KSAMPLER(sampler_function, extra_options, inpaint_options)
def process_conds(model, noise, conds, device, latent_image=None, denoise_mask=None, seed=None):
for k in conds:
conds[k] = conds[k][:]
resolve_areas_and_cond_masks_multidim(conds[k], noise.shape[2:], device)
for k in conds:
calculate_start_end_timesteps(model, conds[k])
if hasattr(model, 'extra_conds'):
for k in conds:
conds[k] = encode_model_conds(model.extra_conds, conds[k], noise, device, k, latent_image=latent_image, denoise_mask=denoise_mask, seed=seed)
#make sure each cond area has an opposite one with the same area
for k in conds:
for c in conds[k]:
for kk in conds:
if k != kk:
create_cond_with_same_area_if_none(conds[kk], c)
for k in conds:
pre_run_control(model, conds[k])
if "positive" in conds:
positive = conds["positive"]
for k in conds:
if k != "positive":
apply_empty_x_to_equal_area(list(filter(lambda c: c.get('control_apply_to_uncond', False) == True, positive)), conds[k], 'control', lambda cond_cnets, x: cond_cnets[x])
apply_empty_x_to_equal_area(positive, conds[k], 'gligen', lambda cond_cnets, x: cond_cnets[x])
return conds
class CFGGuider:
def __init__(self, model_patcher):
self.model_patcher = model_patcher
self.model_options = model_patcher.model_options
self.original_conds = {}
self.cfg = 1.0
def set_conds(self, positive, negative):
self.inner_set_conds({"positive": positive, "negative": negative})
def set_cfg(self, cfg):
self.cfg = cfg
def inner_set_conds(self, conds):
for k in conds:
self.original_conds[k] = comfy.sampler_helpers.convert_cond(conds[k])
def __call__(self, *args, **kwargs):
return self.predict_noise(*args, **kwargs)
def predict_noise(self, x, timestep, model_options={}, seed=None):
return sampling_function(self.inner_model, x, timestep, self.conds.get("negative", None), self.conds.get("positive", None), self.cfg, model_options=model_options, seed=seed)
def inner_sample(self, noise, latent_image, device, sampler, sigmas, denoise_mask, callback, disable_pbar, seed):
if latent_image is not None and torch.count_nonzero(latent_image) > 0: #Don't shift the empty latent image.
latent_image = self.inner_model.process_latent_in(latent_image)
self.conds = process_conds(self.inner_model, noise, self.conds, device, latent_image, denoise_mask, seed)
extra_args = {"model_options": self.model_options, "seed":seed}
samples = sampler.sample(self, sigmas, extra_args, callback, noise, latent_image, denoise_mask, disable_pbar)
return self.inner_model.process_latent_out(samples.to(torch.float32))
def sample(self, noise, latent_image, sampler, sigmas, denoise_mask=None, callback=None, disable_pbar=False, seed=None):
if sigmas.shape[-1] == 0:
return latent_image
self.conds = {}
for k in self.original_conds:
self.conds[k] = list(map(lambda a: a.copy(), self.original_conds[k]))
self.inner_model, self.conds, self.loaded_models = comfy.sampler_helpers.prepare_sampling(self.model_patcher, noise.shape, self.conds)
device = self.model_patcher.load_device
if denoise_mask is not None:
denoise_mask = comfy.sampler_helpers.prepare_mask(denoise_mask, noise.shape, device)
noise = noise.to(device)
latent_image = latent_image.to(device)
sigmas = sigmas.to(device)
output = self.inner_sample(noise, latent_image, device, sampler, sigmas, denoise_mask, callback, disable_pbar, seed)
comfy.sampler_helpers.cleanup_models(self.conds, self.loaded_models)
del self.inner_model
del self.conds
del self.loaded_models
return output
def sample(model, noise, positive, negative, cfg, device, sampler, sigmas, model_options={}, latent_image=None, denoise_mask=None, callback=None, disable_pbar=False, seed=None):
cfg_guider = CFGGuider(model)
cfg_guider.set_conds(positive, negative)
cfg_guider.set_cfg(cfg)
return cfg_guider.sample(noise, latent_image, sampler, sigmas, denoise_mask, callback, disable_pbar, seed)
SCHEDULER_NAMES = ["normal", "karras", "exponential", "sgm_uniform", "simple", "ddim_uniform", "beta"]
SAMPLER_NAMES = KSAMPLER_NAMES + ["ddim", "uni_pc", "uni_pc_bh2"]
def calculate_sigmas(model_sampling, scheduler_name, steps):
if scheduler_name == "karras":
sigmas = k_diffusion_sampling.get_sigmas_karras(n=steps, sigma_min=float(model_sampling.sigma_min), sigma_max=float(model_sampling.sigma_max))
elif scheduler_name == "exponential":
sigmas = k_diffusion_sampling.get_sigmas_exponential(n=steps, sigma_min=float(model_sampling.sigma_min), sigma_max=float(model_sampling.sigma_max))
elif scheduler_name == "normal":
sigmas = normal_scheduler(model_sampling, steps)
elif scheduler_name == "simple":
sigmas = simple_scheduler(model_sampling, steps)
elif scheduler_name == "ddim_uniform":
sigmas = ddim_scheduler(model_sampling, steps)
elif scheduler_name == "sgm_uniform":
sigmas = normal_scheduler(model_sampling, steps, sgm=True)
elif scheduler_name == "beta":
sigmas = beta_scheduler(model_sampling, steps)
else:
logging.error("error invalid scheduler {}".format(scheduler_name))
return sigmas
def sampler_object(name):
if name == "uni_pc":
sampler = KSAMPLER(uni_pc.sample_unipc)
elif name == "uni_pc_bh2":
sampler = KSAMPLER(uni_pc.sample_unipc_bh2)
elif name == "ddim":
sampler = ksampler("euler", inpaint_options={"random": True})
else:
sampler = ksampler(name)
return sampler
class KSampler:
SCHEDULERS = SCHEDULER_NAMES
SAMPLERS = SAMPLER_NAMES
DISCARD_PENULTIMATE_SIGMA_SAMPLERS = set(('dpm_2', 'dpm_2_ancestral', 'uni_pc', 'uni_pc_bh2'))
def __init__(self, model, steps, device, sampler=None, scheduler=None, denoise=None, model_options={}):
self.model = model
self.device = device
if scheduler not in self.SCHEDULERS:
scheduler = self.SCHEDULERS[0]
if sampler not in self.SAMPLERS:
sampler = self.SAMPLERS[0]
self.scheduler = scheduler
self.sampler = sampler
self.set_steps(steps, denoise)
self.denoise = denoise
self.model_options = model_options
def calculate_sigmas(self, steps):
sigmas = None
discard_penultimate_sigma = False
if self.sampler in self.DISCARD_PENULTIMATE_SIGMA_SAMPLERS:
steps += 1
discard_penultimate_sigma = True
sigmas = calculate_sigmas(self.model.get_model_object("model_sampling"), self.scheduler, steps)
if discard_penultimate_sigma:
sigmas = torch.cat([sigmas[:-2], sigmas[-1:]])
return sigmas
def set_steps(self, steps, denoise=None):
self.steps = steps
if denoise is None or denoise > 0.9999:
self.sigmas = self.calculate_sigmas(steps).to(self.device)
else:
if denoise <= 0.0:
self.sigmas = torch.FloatTensor([])
else:
new_steps = int(steps/denoise)
sigmas = self.calculate_sigmas(new_steps).to(self.device)
self.sigmas = sigmas[-(steps + 1):]
def sample(self, noise, positive, negative, cfg, latent_image=None, start_step=None, last_step=None, force_full_denoise=False, denoise_mask=None, sigmas=None, callback=None, disable_pbar=False, seed=None):
if sigmas is None:
sigmas = self.sigmas
if last_step is not None and last_step < (len(sigmas) - 1):
sigmas = sigmas[:last_step + 1]
if force_full_denoise:
sigmas[-1] = 0
if start_step is not None:
if start_step < (len(sigmas) - 1):
sigmas = sigmas[start_step:]
else:
if latent_image is not None:
return latent_image
else:
return torch.zeros_like(noise)
sampler = sampler_object(self.sampler)
return sample(self.model, noise, positive, negative, cfg, self.device, sampler, sigmas, self.model_options, latent_image=latent_image, denoise_mask=denoise_mask, callback=callback, disable_pbar=disable_pbar, seed=seed)

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comfy/sd.py Normal file
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import torch
from enum import Enum
import logging
from comfy import model_management
from .ldm.models.autoencoder import AutoencoderKL, AutoencodingEngine
from .ldm.cascade.stage_a import StageA
from .ldm.cascade.stage_c_coder import StageC_coder
from .ldm.audio.autoencoder import AudioOobleckVAE
import yaml
import comfy.utils
from . import clip_vision
from . import gligen
from . import diffusers_convert
from . import model_detection
from . import sd1_clip
from . import sdxl_clip
import comfy.text_encoders.sd2_clip
import comfy.text_encoders.sd3_clip
import comfy.text_encoders.sa_t5
import comfy.text_encoders.aura_t5
import comfy.text_encoders.hydit
import comfy.text_encoders.flux
import comfy.model_patcher
import comfy.lora
import comfy.t2i_adapter.adapter
import comfy.supported_models_base
import comfy.taesd.taesd
def load_lora_for_models(model, clip, lora, strength_model, strength_clip):
key_map = {}
if model is not None:
key_map = comfy.lora.model_lora_keys_unet(model.model, key_map)
if clip is not None:
key_map = comfy.lora.model_lora_keys_clip(clip.cond_stage_model, key_map)
loaded = comfy.lora.load_lora(lora, key_map)
if model is not None:
new_modelpatcher = model.clone()
k = new_modelpatcher.add_patches(loaded, strength_model)
else:
k = ()
new_modelpatcher = None
if clip is not None:
new_clip = clip.clone()
k1 = new_clip.add_patches(loaded, strength_clip)
else:
k1 = ()
new_clip = None
k = set(k)
k1 = set(k1)
for x in loaded:
if (x not in k) and (x not in k1):
logging.warning("NOT LOADED {}".format(x))
return (new_modelpatcher, new_clip)
class CLIP:
def __init__(self, target=None, embedding_directory=None, no_init=False, tokenizer_data={}):
if no_init:
return
params = target.params.copy()
clip = target.clip
tokenizer = target.tokenizer
load_device = model_management.text_encoder_device()
offload_device = model_management.text_encoder_offload_device()
params['device'] = offload_device
dtype = model_management.text_encoder_dtype(load_device)
params['dtype'] = dtype
self.cond_stage_model = clip(**(params))
for dt in self.cond_stage_model.dtypes:
if not model_management.supports_cast(load_device, dt):
load_device = offload_device
self.tokenizer = tokenizer(embedding_directory=embedding_directory, tokenizer_data=tokenizer_data)
self.patcher = comfy.model_patcher.ModelPatcher(self.cond_stage_model, load_device=load_device, offload_device=offload_device)
self.layer_idx = None
logging.debug("CLIP model load device: {}, offload device: {}".format(load_device, offload_device))
def clone(self):
n = CLIP(no_init=True)
n.patcher = self.patcher.clone()
n.cond_stage_model = self.cond_stage_model
n.tokenizer = self.tokenizer
n.layer_idx = self.layer_idx
return n
def add_patches(self, patches, strength_patch=1.0, strength_model=1.0):
return self.patcher.add_patches(patches, strength_patch, strength_model)
def clip_layer(self, layer_idx):
self.layer_idx = layer_idx
def tokenize(self, text, return_word_ids=False):
return self.tokenizer.tokenize_with_weights(text, return_word_ids)
def encode_from_tokens(self, tokens, return_pooled=False, return_dict=False):
self.cond_stage_model.reset_clip_options()
if self.layer_idx is not None:
self.cond_stage_model.set_clip_options({"layer": self.layer_idx})
if return_pooled == "unprojected":
self.cond_stage_model.set_clip_options({"projected_pooled": False})
self.load_model()
o = self.cond_stage_model.encode_token_weights(tokens)
cond, pooled = o[:2]
if return_dict:
out = {"cond": cond, "pooled_output": pooled}
if len(o) > 2:
for k in o[2]:
out[k] = o[2][k]
return out
if return_pooled:
return cond, pooled
return cond
def encode(self, text):
tokens = self.tokenize(text)
return self.encode_from_tokens(tokens)
def load_sd(self, sd, full_model=False):
if full_model:
return self.cond_stage_model.load_state_dict(sd, strict=False)
else:
return self.cond_stage_model.load_sd(sd)
def get_sd(self):
sd_clip = self.cond_stage_model.state_dict()
sd_tokenizer = self.tokenizer.state_dict()
for k in sd_tokenizer:
sd_clip[k] = sd_tokenizer[k]
return sd_clip
def load_model(self):
model_management.load_model_gpu(self.patcher)
return self.patcher
def get_key_patches(self):
return self.patcher.get_key_patches()
class VAE:
def __init__(self, sd=None, device=None, config=None, dtype=None):
if 'decoder.up_blocks.0.resnets.0.norm1.weight' in sd.keys(): #diffusers format
sd = diffusers_convert.convert_vae_state_dict(sd)
self.memory_used_encode = lambda shape, dtype: (1767 * shape[2] * shape[3]) * model_management.dtype_size(dtype) #These are for AutoencoderKL and need tweaking (should be lower)
self.memory_used_decode = lambda shape, dtype: (2178 * shape[2] * shape[3] * 64) * model_management.dtype_size(dtype)
self.downscale_ratio = 8
self.upscale_ratio = 8
self.latent_channels = 4
self.output_channels = 3
self.process_input = lambda image: image * 2.0 - 1.0
self.process_output = lambda image: torch.clamp((image + 1.0) / 2.0, min=0.0, max=1.0)
self.working_dtypes = [torch.bfloat16, torch.float32]
if config is None:
if "decoder.mid.block_1.mix_factor" in sd:
encoder_config = {'double_z': True, 'z_channels': 4, 'resolution': 256, 'in_channels': 3, 'out_ch': 3, 'ch': 128, 'ch_mult': [1, 2, 4, 4], 'num_res_blocks': 2, 'attn_resolutions': [], 'dropout': 0.0}
decoder_config = encoder_config.copy()
decoder_config["video_kernel_size"] = [3, 1, 1]
decoder_config["alpha"] = 0.0
self.first_stage_model = AutoencodingEngine(regularizer_config={'target': "comfy.ldm.models.autoencoder.DiagonalGaussianRegularizer"},
encoder_config={'target': "comfy.ldm.modules.diffusionmodules.model.Encoder", 'params': encoder_config},
decoder_config={'target': "comfy.ldm.modules.temporal_ae.VideoDecoder", 'params': decoder_config})
elif "taesd_decoder.1.weight" in sd:
self.latent_channels = sd["taesd_decoder.1.weight"].shape[1]
self.first_stage_model = comfy.taesd.taesd.TAESD(latent_channels=self.latent_channels)
elif "vquantizer.codebook.weight" in sd: #VQGan: stage a of stable cascade
self.first_stage_model = StageA()
self.downscale_ratio = 4
self.upscale_ratio = 4
#TODO
#self.memory_used_encode
#self.memory_used_decode
self.process_input = lambda image: image
self.process_output = lambda image: image
elif "backbone.1.0.block.0.1.num_batches_tracked" in sd: #effnet: encoder for stage c latent of stable cascade
self.first_stage_model = StageC_coder()
self.downscale_ratio = 32
self.latent_channels = 16
new_sd = {}
for k in sd:
new_sd["encoder.{}".format(k)] = sd[k]
sd = new_sd
elif "blocks.11.num_batches_tracked" in sd: #previewer: decoder for stage c latent of stable cascade
self.first_stage_model = StageC_coder()
self.latent_channels = 16
new_sd = {}
for k in sd:
new_sd["previewer.{}".format(k)] = sd[k]
sd = new_sd
elif "encoder.backbone.1.0.block.0.1.num_batches_tracked" in sd: #combined effnet and previewer for stable cascade
self.first_stage_model = StageC_coder()
self.downscale_ratio = 32
self.latent_channels = 16
elif "decoder.conv_in.weight" in sd:
#default SD1.x/SD2.x VAE parameters
ddconfig = {'double_z': True, 'z_channels': 4, 'resolution': 256, 'in_channels': 3, 'out_ch': 3, 'ch': 128, 'ch_mult': [1, 2, 4, 4], 'num_res_blocks': 2, 'attn_resolutions': [], 'dropout': 0.0}
if 'encoder.down.2.downsample.conv.weight' not in sd and 'decoder.up.3.upsample.conv.weight' not in sd: #Stable diffusion x4 upscaler VAE
ddconfig['ch_mult'] = [1, 2, 4]
self.downscale_ratio = 4
self.upscale_ratio = 4
self.latent_channels = ddconfig['z_channels'] = sd["decoder.conv_in.weight"].shape[1]
if 'quant_conv.weight' in sd:
self.first_stage_model = AutoencoderKL(ddconfig=ddconfig, embed_dim=4)
else:
self.first_stage_model = AutoencodingEngine(regularizer_config={'target': "comfy.ldm.models.autoencoder.DiagonalGaussianRegularizer"},
encoder_config={'target': "comfy.ldm.modules.diffusionmodules.model.Encoder", 'params': ddconfig},
decoder_config={'target': "comfy.ldm.modules.diffusionmodules.model.Decoder", 'params': ddconfig})
elif "decoder.layers.1.layers.0.beta" in sd:
self.first_stage_model = AudioOobleckVAE()
self.memory_used_encode = lambda shape, dtype: (1000 * shape[2]) * model_management.dtype_size(dtype)
self.memory_used_decode = lambda shape, dtype: (1000 * shape[2] * 2048) * model_management.dtype_size(dtype)
self.latent_channels = 64
self.output_channels = 2
self.upscale_ratio = 2048
self.downscale_ratio = 2048
self.process_output = lambda audio: audio
self.process_input = lambda audio: audio
self.working_dtypes = [torch.float16, torch.bfloat16, torch.float32]
else:
logging.warning("WARNING: No VAE weights detected, VAE not initalized.")
self.first_stage_model = None
return
else:
self.first_stage_model = AutoencoderKL(**(config['params']))
self.first_stage_model = self.first_stage_model.eval()
m, u = self.first_stage_model.load_state_dict(sd, strict=False)
if len(m) > 0:
logging.warning("Missing VAE keys {}".format(m))
if len(u) > 0:
logging.debug("Leftover VAE keys {}".format(u))
if device is None:
device = model_management.vae_device()
self.device = device
offload_device = model_management.vae_offload_device()
if dtype is None:
dtype = model_management.vae_dtype(self.device, self.working_dtypes)
self.vae_dtype = dtype
self.first_stage_model.to(self.vae_dtype)
self.output_device = model_management.intermediate_device()
self.patcher = comfy.model_patcher.ModelPatcher(self.first_stage_model, load_device=self.device, offload_device=offload_device)
logging.debug("VAE load device: {}, offload device: {}, dtype: {}".format(self.device, offload_device, self.vae_dtype))
def vae_encode_crop_pixels(self, pixels):
dims = pixels.shape[1:-1]
for d in range(len(dims)):
x = (dims[d] // self.downscale_ratio) * self.downscale_ratio
x_offset = (dims[d] % self.downscale_ratio) // 2
if x != dims[d]:
pixels = pixels.narrow(d + 1, x_offset, x)
return pixels
def decode_tiled_(self, samples, tile_x=64, tile_y=64, overlap = 16):
steps = samples.shape[0] * comfy.utils.get_tiled_scale_steps(samples.shape[3], samples.shape[2], tile_x, tile_y, overlap)
steps += samples.shape[0] * comfy.utils.get_tiled_scale_steps(samples.shape[3], samples.shape[2], tile_x // 2, tile_y * 2, overlap)
steps += samples.shape[0] * comfy.utils.get_tiled_scale_steps(samples.shape[3], samples.shape[2], tile_x * 2, tile_y // 2, overlap)
pbar = comfy.utils.ProgressBar(steps)
decode_fn = lambda a: self.first_stage_model.decode(a.to(self.vae_dtype).to(self.device)).float()
output = self.process_output(
(comfy.utils.tiled_scale(samples, decode_fn, tile_x // 2, tile_y * 2, overlap, upscale_amount = self.upscale_ratio, output_device=self.output_device, pbar = pbar) +
comfy.utils.tiled_scale(samples, decode_fn, tile_x * 2, tile_y // 2, overlap, upscale_amount = self.upscale_ratio, output_device=self.output_device, pbar = pbar) +
comfy.utils.tiled_scale(samples, decode_fn, tile_x, tile_y, overlap, upscale_amount = self.upscale_ratio, output_device=self.output_device, pbar = pbar))
/ 3.0)
return output
def decode_tiled_1d(self, samples, tile_x=128, overlap=32):
decode_fn = lambda a: self.first_stage_model.decode(a.to(self.vae_dtype).to(self.device)).float()
return comfy.utils.tiled_scale_multidim(samples, decode_fn, tile=(tile_x,), overlap=overlap, upscale_amount=self.upscale_ratio, out_channels=self.output_channels, output_device=self.output_device)
def encode_tiled_(self, pixel_samples, tile_x=512, tile_y=512, overlap = 64):
steps = pixel_samples.shape[0] * comfy.utils.get_tiled_scale_steps(pixel_samples.shape[3], pixel_samples.shape[2], tile_x, tile_y, overlap)
steps += pixel_samples.shape[0] * comfy.utils.get_tiled_scale_steps(pixel_samples.shape[3], pixel_samples.shape[2], tile_x // 2, tile_y * 2, overlap)
steps += pixel_samples.shape[0] * comfy.utils.get_tiled_scale_steps(pixel_samples.shape[3], pixel_samples.shape[2], tile_x * 2, tile_y // 2, overlap)
pbar = comfy.utils.ProgressBar(steps)
encode_fn = lambda a: self.first_stage_model.encode((self.process_input(a)).to(self.vae_dtype).to(self.device)).float()
samples = comfy.utils.tiled_scale(pixel_samples, encode_fn, tile_x, tile_y, overlap, upscale_amount = (1/self.downscale_ratio), out_channels=self.latent_channels, output_device=self.output_device, pbar=pbar)
samples += comfy.utils.tiled_scale(pixel_samples, encode_fn, tile_x * 2, tile_y // 2, overlap, upscale_amount = (1/self.downscale_ratio), out_channels=self.latent_channels, output_device=self.output_device, pbar=pbar)
samples += comfy.utils.tiled_scale(pixel_samples, encode_fn, tile_x // 2, tile_y * 2, overlap, upscale_amount = (1/self.downscale_ratio), out_channels=self.latent_channels, output_device=self.output_device, pbar=pbar)
samples /= 3.0
return samples
def encode_tiled_1d(self, samples, tile_x=128 * 2048, overlap=32 * 2048):
encode_fn = lambda a: self.first_stage_model.encode((self.process_input(a)).to(self.vae_dtype).to(self.device)).float()
return comfy.utils.tiled_scale_multidim(samples, encode_fn, tile=(tile_x,), overlap=overlap, upscale_amount=(1/self.downscale_ratio), out_channels=self.latent_channels, output_device=self.output_device)
def decode(self, samples_in):
try:
memory_used = self.memory_used_decode(samples_in.shape, self.vae_dtype)
model_management.load_models_gpu([self.patcher], memory_required=memory_used)
free_memory = model_management.get_free_memory(self.device)
batch_number = int(free_memory / memory_used)
batch_number = max(1, batch_number)
pixel_samples = torch.empty((samples_in.shape[0], self.output_channels) + tuple(map(lambda a: a * self.upscale_ratio, samples_in.shape[2:])), device=self.output_device)
for x in range(0, samples_in.shape[0], batch_number):
samples = samples_in[x:x+batch_number].to(self.vae_dtype).to(self.device)
pixel_samples[x:x+batch_number] = self.process_output(self.first_stage_model.decode(samples).to(self.output_device).float())
except model_management.OOM_EXCEPTION as e:
logging.warning("Warning: Ran out of memory when regular VAE decoding, retrying with tiled VAE decoding.")
if len(samples_in.shape) == 3:
pixel_samples = self.decode_tiled_1d(samples_in)
else:
pixel_samples = self.decode_tiled_(samples_in)
pixel_samples = pixel_samples.to(self.output_device).movedim(1,-1)
return pixel_samples
def decode_tiled(self, samples, tile_x=64, tile_y=64, overlap = 16):
model_management.load_model_gpu(self.patcher)
output = self.decode_tiled_(samples, tile_x, tile_y, overlap)
return output.movedim(1,-1)
def encode(self, pixel_samples):
pixel_samples = self.vae_encode_crop_pixels(pixel_samples)
pixel_samples = pixel_samples.movedim(-1,1)
try:
memory_used = self.memory_used_encode(pixel_samples.shape, self.vae_dtype)
model_management.load_models_gpu([self.patcher], memory_required=memory_used)
free_memory = model_management.get_free_memory(self.device)
batch_number = int(free_memory / memory_used)
batch_number = max(1, batch_number)
samples = torch.empty((pixel_samples.shape[0], self.latent_channels) + tuple(map(lambda a: a // self.downscale_ratio, pixel_samples.shape[2:])), device=self.output_device)
for x in range(0, pixel_samples.shape[0], batch_number):
pixels_in = self.process_input(pixel_samples[x:x+batch_number]).to(self.vae_dtype).to(self.device)
samples[x:x+batch_number] = self.first_stage_model.encode(pixels_in).to(self.output_device).float()
except model_management.OOM_EXCEPTION as e:
logging.warning("Warning: Ran out of memory when regular VAE encoding, retrying with tiled VAE encoding.")
if len(pixel_samples.shape) == 3:
samples = self.encode_tiled_1d(pixel_samples)
else:
samples = self.encode_tiled_(pixel_samples)
return samples
def encode_tiled(self, pixel_samples, tile_x=512, tile_y=512, overlap = 64):
pixel_samples = self.vae_encode_crop_pixels(pixel_samples)
model_management.load_model_gpu(self.patcher)
pixel_samples = pixel_samples.movedim(-1,1)
samples = self.encode_tiled_(pixel_samples, tile_x=tile_x, tile_y=tile_y, overlap=overlap)
return samples
def get_sd(self):
return self.first_stage_model.state_dict()
class StyleModel:
def __init__(self, model, device="cpu"):
self.model = model
def get_cond(self, input):
return self.model(input.last_hidden_state)
def load_style_model(ckpt_path):
model_data = comfy.utils.load_torch_file(ckpt_path, safe_load=True)
keys = model_data.keys()
if "style_embedding" in keys:
model = comfy.t2i_adapter.adapter.StyleAdapter(width=1024, context_dim=768, num_head=8, n_layes=3, num_token=8)
else:
raise Exception("invalid style model {}".format(ckpt_path))
model.load_state_dict(model_data)
return StyleModel(model)
class CLIPType(Enum):
STABLE_DIFFUSION = 1
STABLE_CASCADE = 2
SD3 = 3
STABLE_AUDIO = 4
HUNYUAN_DIT = 5
FLUX = 6
def load_clip(ckpt_paths, embedding_directory=None, clip_type=CLIPType.STABLE_DIFFUSION):
clip_data = []
for p in ckpt_paths:
clip_data.append(comfy.utils.load_torch_file(p, safe_load=True))
class EmptyClass:
pass
for i in range(len(clip_data)):
if "transformer.resblocks.0.ln_1.weight" in clip_data[i]:
clip_data[i] = comfy.utils.clip_text_transformers_convert(clip_data[i], "", "")
else:
if "text_projection" in clip_data[i]:
clip_data[i]["text_projection.weight"] = clip_data[i]["text_projection"].transpose(0, 1) #old models saved with the CLIPSave node
clip_target = EmptyClass()
clip_target.params = {}
if len(clip_data) == 1:
if "text_model.encoder.layers.30.mlp.fc1.weight" in clip_data[0]:
if clip_type == CLIPType.STABLE_CASCADE:
clip_target.clip = sdxl_clip.StableCascadeClipModel
clip_target.tokenizer = sdxl_clip.StableCascadeTokenizer
else:
clip_target.clip = sdxl_clip.SDXLRefinerClipModel
clip_target.tokenizer = sdxl_clip.SDXLTokenizer
elif "text_model.encoder.layers.22.mlp.fc1.weight" in clip_data[0]:
clip_target.clip = comfy.text_encoders.sd2_clip.SD2ClipModel
clip_target.tokenizer = comfy.text_encoders.sd2_clip.SD2Tokenizer
elif "encoder.block.23.layer.1.DenseReluDense.wi_1.weight" in clip_data[0]:
weight = clip_data[0]["encoder.block.23.layer.1.DenseReluDense.wi_1.weight"]
dtype_t5 = weight.dtype
if weight.shape[-1] == 4096:
clip_target.clip = comfy.text_encoders.sd3_clip.sd3_clip(clip_l=False, clip_g=False, t5=True, dtype_t5=dtype_t5)
clip_target.tokenizer = comfy.text_encoders.sd3_clip.SD3Tokenizer
elif weight.shape[-1] == 2048:
clip_target.clip = comfy.text_encoders.aura_t5.AuraT5Model
clip_target.tokenizer = comfy.text_encoders.aura_t5.AuraT5Tokenizer
elif "encoder.block.0.layer.0.SelfAttention.k.weight" in clip_data[0]:
clip_target.clip = comfy.text_encoders.sa_t5.SAT5Model
clip_target.tokenizer = comfy.text_encoders.sa_t5.SAT5Tokenizer
else:
clip_target.clip = sd1_clip.SD1ClipModel
clip_target.tokenizer = sd1_clip.SD1Tokenizer
elif len(clip_data) == 2:
if clip_type == CLIPType.SD3:
clip_target.clip = comfy.text_encoders.sd3_clip.sd3_clip(clip_l=True, clip_g=True, t5=False)
clip_target.tokenizer = comfy.text_encoders.sd3_clip.SD3Tokenizer
elif clip_type == CLIPType.HUNYUAN_DIT:
clip_target.clip = comfy.text_encoders.hydit.HyditModel
clip_target.tokenizer = comfy.text_encoders.hydit.HyditTokenizer
elif clip_type == CLIPType.FLUX:
weight_name = "encoder.block.23.layer.1.DenseReluDense.wi_1.weight"
weight = clip_data[0].get(weight_name, clip_data[1].get(weight_name, None))
dtype_t5 = None
if weight is not None:
dtype_t5 = weight.dtype
clip_target.clip = comfy.text_encoders.flux.flux_clip(dtype_t5=dtype_t5)
clip_target.tokenizer = comfy.text_encoders.flux.FluxTokenizer
else:
clip_target.clip = sdxl_clip.SDXLClipModel
clip_target.tokenizer = sdxl_clip.SDXLTokenizer
elif len(clip_data) == 3:
clip_target.clip = comfy.text_encoders.sd3_clip.SD3ClipModel
clip_target.tokenizer = comfy.text_encoders.sd3_clip.SD3Tokenizer
clip = CLIP(clip_target, embedding_directory=embedding_directory)
for c in clip_data:
m, u = clip.load_sd(c)
if len(m) > 0:
logging.warning("clip missing: {}".format(m))
if len(u) > 0:
logging.debug("clip unexpected: {}".format(u))
return clip
def load_gligen(ckpt_path):
data = comfy.utils.load_torch_file(ckpt_path, safe_load=True)
model = gligen.load_gligen(data)
if model_management.should_use_fp16():
model = model.half()
return comfy.model_patcher.ModelPatcher(model, load_device=model_management.get_torch_device(), offload_device=model_management.unet_offload_device())
def load_checkpoint(config_path=None, ckpt_path=None, output_vae=True, output_clip=True, embedding_directory=None, state_dict=None, config=None):
logging.warning("Warning: The load checkpoint with config function is deprecated and will eventually be removed, please use the other one.")
model, clip, vae, _ = load_checkpoint_guess_config(ckpt_path, output_vae=output_vae, output_clip=output_clip, output_clipvision=False, embedding_directory=embedding_directory, output_model=True)
#TODO: this function is a mess and should be removed eventually
if config is None:
with open(config_path, 'r') as stream:
config = yaml.safe_load(stream)
model_config_params = config['model']['params']
clip_config = model_config_params['cond_stage_config']
scale_factor = model_config_params['scale_factor']
if "parameterization" in model_config_params:
if model_config_params["parameterization"] == "v":
m = model.clone()
class ModelSamplingAdvanced(comfy.model_sampling.ModelSamplingDiscrete, comfy.model_sampling.V_PREDICTION):
pass
m.add_object_patch("model_sampling", ModelSamplingAdvanced(model.model.model_config))
model = m
layer_idx = clip_config.get("params", {}).get("layer_idx", None)
if layer_idx is not None:
clip.clip_layer(layer_idx)
return (model, clip, vae)
def load_checkpoint_guess_config(ckpt_path, output_vae=True, output_clip=True, output_clipvision=False, embedding_directory=None, output_model=True):
sd = comfy.utils.load_torch_file(ckpt_path)
sd_keys = sd.keys()
clip = None
clipvision = None
vae = None
model = None
model_patcher = None
clip_target = None
diffusion_model_prefix = model_detection.unet_prefix_from_state_dict(sd)
parameters = comfy.utils.calculate_parameters(sd, diffusion_model_prefix)
load_device = model_management.get_torch_device()
model_config = model_detection.model_config_from_unet(sd, diffusion_model_prefix)
if model_config is None:
raise RuntimeError("ERROR: Could not detect model type of: {}".format(ckpt_path))
unet_dtype = model_management.unet_dtype(model_params=parameters, supported_dtypes=model_config.supported_inference_dtypes)
manual_cast_dtype = model_management.unet_manual_cast(unet_dtype, load_device, model_config.supported_inference_dtypes)
model_config.set_inference_dtype(unet_dtype, manual_cast_dtype)
if model_config.clip_vision_prefix is not None:
if output_clipvision:
clipvision = clip_vision.load_clipvision_from_sd(sd, model_config.clip_vision_prefix, True)
if output_model:
inital_load_device = model_management.unet_inital_load_device(parameters, unet_dtype)
offload_device = model_management.unet_offload_device()
model = model_config.get_model(sd, diffusion_model_prefix, device=inital_load_device)
model.load_model_weights(sd, diffusion_model_prefix)
if output_vae:
vae_sd = comfy.utils.state_dict_prefix_replace(sd, {k: "" for k in model_config.vae_key_prefix}, filter_keys=True)
vae_sd = model_config.process_vae_state_dict(vae_sd)
vae = VAE(sd=vae_sd)
if output_clip:
clip_target = model_config.clip_target(state_dict=sd)
if clip_target is not None:
clip_sd = model_config.process_clip_state_dict(sd)
if len(clip_sd) > 0:
clip = CLIP(clip_target, embedding_directory=embedding_directory, tokenizer_data=clip_sd)
m, u = clip.load_sd(clip_sd, full_model=True)
if len(m) > 0:
m_filter = list(filter(lambda a: ".logit_scale" not in a and ".transformer.text_projection.weight" not in a, m))
if len(m_filter) > 0:
logging.warning("clip missing: {}".format(m))
else:
logging.debug("clip missing: {}".format(m))
if len(u) > 0:
logging.debug("clip unexpected {}:".format(u))
else:
logging.warning("no CLIP/text encoder weights in checkpoint, the text encoder model will not be loaded.")
left_over = sd.keys()
if len(left_over) > 0:
logging.debug("left over keys: {}".format(left_over))
if output_model:
model_patcher = comfy.model_patcher.ModelPatcher(model, load_device=load_device, offload_device=model_management.unet_offload_device(), current_device=inital_load_device)
if inital_load_device != torch.device("cpu"):
logging.info("loaded straight to GPU")
model_management.load_model_gpu(model_patcher)
return (model_patcher, clip, vae, clipvision)
def load_unet_state_dict(sd, dtype=None): #load unet in diffusers or regular format
#Allow loading unets from checkpoint files
diffusion_model_prefix = model_detection.unet_prefix_from_state_dict(sd)
temp_sd = comfy.utils.state_dict_prefix_replace(sd, {diffusion_model_prefix: ""}, filter_keys=True)
if len(temp_sd) > 0:
sd = temp_sd
parameters = comfy.utils.calculate_parameters(sd)
load_device = model_management.get_torch_device()
model_config = model_detection.model_config_from_unet(sd, "")
if model_config is not None:
new_sd = sd
else:
new_sd = model_detection.convert_diffusers_mmdit(sd, "")
if new_sd is not None: #diffusers mmdit
model_config = model_detection.model_config_from_unet(new_sd, "")
if model_config is None:
return None
else: #diffusers unet
model_config = model_detection.model_config_from_diffusers_unet(sd)
if model_config is None:
return None
diffusers_keys = comfy.utils.unet_to_diffusers(model_config.unet_config)
new_sd = {}
for k in diffusers_keys:
if k in sd:
new_sd[diffusers_keys[k]] = sd.pop(k)
else:
logging.warning("{} {}".format(diffusers_keys[k], k))
offload_device = model_management.unet_offload_device()
if dtype is None:
unet_dtype = model_management.unet_dtype(model_params=parameters, supported_dtypes=model_config.supported_inference_dtypes)
else:
unet_dtype = dtype
manual_cast_dtype = model_management.unet_manual_cast(unet_dtype, load_device, model_config.supported_inference_dtypes)
model_config.set_inference_dtype(unet_dtype, manual_cast_dtype)
model = model_config.get_model(new_sd, "")
model = model.to(offload_device)
model.load_model_weights(new_sd, "")
left_over = sd.keys()
if len(left_over) > 0:
logging.info("left over keys in unet: {}".format(left_over))
return comfy.model_patcher.ModelPatcher(model, load_device=load_device, offload_device=offload_device)
def load_unet(unet_path, dtype=None):
sd = comfy.utils.load_torch_file(unet_path)
model = load_unet_state_dict(sd, dtype=dtype)
if model is None:
logging.error("ERROR UNSUPPORTED UNET {}".format(unet_path))
raise RuntimeError("ERROR: Could not detect model type of: {}".format(unet_path))
return model
def save_checkpoint(output_path, model, clip=None, vae=None, clip_vision=None, metadata=None, extra_keys={}):
clip_sd = None
load_models = [model]
if clip is not None:
load_models.append(clip.load_model())
clip_sd = clip.get_sd()
model_management.load_models_gpu(load_models, force_patch_weights=True)
clip_vision_sd = clip_vision.get_sd() if clip_vision is not None else None
sd = model.model.state_dict_for_saving(clip_sd, vae.get_sd(), clip_vision_sd)
for k in extra_keys:
sd[k] = extra_keys[k]
for k in sd:
t = sd[k]
if not t.is_contiguous():
sd[k] = t.contiguous()
comfy.utils.save_torch_file(sd, output_path, metadata=metadata)

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comfy/sd1_clip.py Normal file
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import os
from transformers import CLIPTokenizer
import comfy.ops
import torch
import traceback
import zipfile
from . import model_management
import comfy.clip_model
import json
import logging
import numbers
def gen_empty_tokens(special_tokens, length):
start_token = special_tokens.get("start", None)
end_token = special_tokens.get("end", None)
pad_token = special_tokens.get("pad")
output = []
if start_token is not None:
output.append(start_token)
if end_token is not None:
output.append(end_token)
output += [pad_token] * (length - len(output))
return output
class ClipTokenWeightEncoder:
def encode_token_weights(self, token_weight_pairs):
to_encode = list()
max_token_len = 0
has_weights = False
for x in token_weight_pairs:
tokens = list(map(lambda a: a[0], x))
max_token_len = max(len(tokens), max_token_len)
has_weights = has_weights or not all(map(lambda a: a[1] == 1.0, x))
to_encode.append(tokens)
sections = len(to_encode)
if has_weights or sections == 0:
to_encode.append(gen_empty_tokens(self.special_tokens, max_token_len))
o = self.encode(to_encode)
out, pooled = o[:2]
if pooled is not None:
first_pooled = pooled[0:1].to(model_management.intermediate_device())
else:
first_pooled = pooled
output = []
for k in range(0, sections):
z = out[k:k+1]
if has_weights:
z_empty = out[-1]
for i in range(len(z)):
for j in range(len(z[i])):
weight = token_weight_pairs[k][j][1]
if weight != 1.0:
z[i][j] = (z[i][j] - z_empty[j]) * weight + z_empty[j]
output.append(z)
if (len(output) == 0):
r = (out[-1:].to(model_management.intermediate_device()), first_pooled)
else:
r = (torch.cat(output, dim=-2).to(model_management.intermediate_device()), first_pooled)
if len(o) > 2:
extra = {}
for k in o[2]:
v = o[2][k]
if k == "attention_mask":
v = v[:sections].flatten().unsqueeze(dim=0).to(model_management.intermediate_device())
extra[k] = v
r = r + (extra,)
return r
class SDClipModel(torch.nn.Module, ClipTokenWeightEncoder):
"""Uses the CLIP transformer encoder for text (from huggingface)"""
LAYERS = [
"last",
"pooled",
"hidden"
]
def __init__(self, version="openai/clip-vit-large-patch14", device="cpu", max_length=77,
freeze=True, layer="last", layer_idx=None, textmodel_json_config=None, dtype=None, model_class=comfy.clip_model.CLIPTextModel,
special_tokens={"start": 49406, "end": 49407, "pad": 49407}, layer_norm_hidden_state=True, enable_attention_masks=False, zero_out_masked=False,
return_projected_pooled=True, return_attention_masks=False): # clip-vit-base-patch32
super().__init__()
assert layer in self.LAYERS
if textmodel_json_config is None:
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "sd1_clip_config.json")
with open(textmodel_json_config) as f:
config = json.load(f)
self.operations = comfy.ops.manual_cast
self.transformer = model_class(config, dtype, device, self.operations)
self.num_layers = self.transformer.num_layers
self.max_length = max_length
if freeze:
self.freeze()
self.layer = layer
self.layer_idx = None
self.special_tokens = special_tokens
self.logit_scale = torch.nn.Parameter(torch.tensor(4.6055))
self.enable_attention_masks = enable_attention_masks
self.zero_out_masked = zero_out_masked
self.layer_norm_hidden_state = layer_norm_hidden_state
self.return_projected_pooled = return_projected_pooled
self.return_attention_masks = return_attention_masks
if layer == "hidden":
assert layer_idx is not None
assert abs(layer_idx) < self.num_layers
self.set_clip_options({"layer": layer_idx})
self.options_default = (self.layer, self.layer_idx, self.return_projected_pooled)
def freeze(self):
self.transformer = self.transformer.eval()
#self.train = disabled_train
for param in self.parameters():
param.requires_grad = False
def set_clip_options(self, options):
layer_idx = options.get("layer", self.layer_idx)
self.return_projected_pooled = options.get("projected_pooled", self.return_projected_pooled)
if layer_idx is None or abs(layer_idx) > self.num_layers:
self.layer = "last"
else:
self.layer = "hidden"
self.layer_idx = layer_idx
def reset_clip_options(self):
self.layer = self.options_default[0]
self.layer_idx = self.options_default[1]
self.return_projected_pooled = self.options_default[2]
def set_up_textual_embeddings(self, tokens, current_embeds):
out_tokens = []
next_new_token = token_dict_size = current_embeds.weight.shape[0]
embedding_weights = []
for x in tokens:
tokens_temp = []
for y in x:
if isinstance(y, numbers.Integral):
tokens_temp += [int(y)]
else:
if y.shape[0] == current_embeds.weight.shape[1]:
embedding_weights += [y]
tokens_temp += [next_new_token]
next_new_token += 1
else:
logging.warning("WARNING: shape mismatch when trying to apply embedding, embedding will be ignored {} != {}".format(y.shape[0], current_embeds.weight.shape[1]))
while len(tokens_temp) < len(x):
tokens_temp += [self.special_tokens["pad"]]
out_tokens += [tokens_temp]
n = token_dict_size
if len(embedding_weights) > 0:
new_embedding = self.operations.Embedding(next_new_token + 1, current_embeds.weight.shape[1], device=current_embeds.weight.device, dtype=current_embeds.weight.dtype)
new_embedding.weight[:token_dict_size] = current_embeds.weight
for x in embedding_weights:
new_embedding.weight[n] = x
n += 1
self.transformer.set_input_embeddings(new_embedding)
processed_tokens = []
for x in out_tokens:
processed_tokens += [list(map(lambda a: n if a == -1 else a, x))] #The EOS token should always be the largest one
return processed_tokens
def forward(self, tokens):
backup_embeds = self.transformer.get_input_embeddings()
device = backup_embeds.weight.device
tokens = self.set_up_textual_embeddings(tokens, backup_embeds)
tokens = torch.LongTensor(tokens).to(device)
attention_mask = None
if self.enable_attention_masks or self.zero_out_masked or self.return_attention_masks:
attention_mask = torch.zeros_like(tokens)
end_token = self.special_tokens.get("end", -1)
for x in range(attention_mask.shape[0]):
for y in range(attention_mask.shape[1]):
attention_mask[x, y] = 1
if tokens[x, y] == end_token:
break
attention_mask_model = None
if self.enable_attention_masks:
attention_mask_model = attention_mask
outputs = self.transformer(tokens, attention_mask_model, intermediate_output=self.layer_idx, final_layer_norm_intermediate=self.layer_norm_hidden_state, dtype=torch.float32)
self.transformer.set_input_embeddings(backup_embeds)
if self.layer == "last":
z = outputs[0].float()
else:
z = outputs[1].float()
if self.zero_out_masked:
z *= attention_mask.unsqueeze(-1).float()
pooled_output = None
if len(outputs) >= 3:
if not self.return_projected_pooled and len(outputs) >= 4 and outputs[3] is not None:
pooled_output = outputs[3].float()
elif outputs[2] is not None:
pooled_output = outputs[2].float()
extra = {}
if self.return_attention_masks:
extra["attention_mask"] = attention_mask
if len(extra) > 0:
return z, pooled_output, extra
return z, pooled_output
def encode(self, tokens):
return self(tokens)
def load_sd(self, sd):
return self.transformer.load_state_dict(sd, strict=False)
def parse_parentheses(string):
result = []
current_item = ""
nesting_level = 0
for char in string:
if char == "(":
if nesting_level == 0:
if current_item:
result.append(current_item)
current_item = "("
else:
current_item = "("
else:
current_item += char
nesting_level += 1
elif char == ")":
nesting_level -= 1
if nesting_level == 0:
result.append(current_item + ")")
current_item = ""
else:
current_item += char
else:
current_item += char
if current_item:
result.append(current_item)
return result
def token_weights(string, current_weight):
a = parse_parentheses(string)
out = []
for x in a:
weight = current_weight
if len(x) >= 2 and x[-1] == ')' and x[0] == '(':
x = x[1:-1]
xx = x.rfind(":")
weight *= 1.1
if xx > 0:
try:
weight = float(x[xx+1:])
x = x[:xx]
except:
pass
out += token_weights(x, weight)
else:
out += [(x, current_weight)]
return out
def escape_important(text):
text = text.replace("\\)", "\0\1")
text = text.replace("\\(", "\0\2")
return text
def unescape_important(text):
text = text.replace("\0\1", ")")
text = text.replace("\0\2", "(")
return text
def safe_load_embed_zip(embed_path):
with zipfile.ZipFile(embed_path) as myzip:
names = list(filter(lambda a: "data/" in a, myzip.namelist()))
names.reverse()
for n in names:
with myzip.open(n) as myfile:
data = myfile.read()
number = len(data) // 4
length_embed = 1024 #sd2.x
if number < 768:
continue
if number % 768 == 0:
length_embed = 768 #sd1.x
num_embeds = number // length_embed
embed = torch.frombuffer(data, dtype=torch.float)
out = embed.reshape((num_embeds, length_embed)).clone()
del embed
return out
def expand_directory_list(directories):
dirs = set()
for x in directories:
dirs.add(x)
for root, subdir, file in os.walk(x, followlinks=True):
dirs.add(root)
return list(dirs)
def load_embed(embedding_name, embedding_directory, embedding_size, embed_key=None):
if isinstance(embedding_directory, str):
embedding_directory = [embedding_directory]
embedding_directory = expand_directory_list(embedding_directory)
valid_file = None
for embed_dir in embedding_directory:
embed_path = os.path.abspath(os.path.join(embed_dir, embedding_name))
embed_dir = os.path.abspath(embed_dir)
try:
if os.path.commonpath((embed_dir, embed_path)) != embed_dir:
continue
except:
continue
if not os.path.isfile(embed_path):
extensions = ['.safetensors', '.pt', '.bin']
for x in extensions:
t = embed_path + x
if os.path.isfile(t):
valid_file = t
break
else:
valid_file = embed_path
if valid_file is not None:
break
if valid_file is None:
return None
embed_path = valid_file
embed_out = None
try:
if embed_path.lower().endswith(".safetensors"):
import safetensors.torch
embed = safetensors.torch.load_file(embed_path, device="cpu")
else:
if 'weights_only' in torch.load.__code__.co_varnames:
try:
embed = torch.load(embed_path, weights_only=True, map_location="cpu")
except:
embed_out = safe_load_embed_zip(embed_path)
else:
embed = torch.load(embed_path, map_location="cpu")
except Exception as e:
logging.warning("{}\n\nerror loading embedding, skipping loading: {}".format(traceback.format_exc(), embedding_name))
return None
if embed_out is None:
if 'string_to_param' in embed:
values = embed['string_to_param'].values()
embed_out = next(iter(values))
elif isinstance(embed, list):
out_list = []
for x in range(len(embed)):
for k in embed[x]:
t = embed[x][k]
if t.shape[-1] != embedding_size:
continue
out_list.append(t.reshape(-1, t.shape[-1]))
embed_out = torch.cat(out_list, dim=0)
elif embed_key is not None and embed_key in embed:
embed_out = embed[embed_key]
else:
values = embed.values()
embed_out = next(iter(values))
return embed_out
class SDTokenizer:
def __init__(self, tokenizer_path=None, max_length=77, pad_with_end=True, embedding_directory=None, embedding_size=768, embedding_key='clip_l', tokenizer_class=CLIPTokenizer, has_start_token=True, pad_to_max_length=True, min_length=None, pad_token=None, tokenizer_data={}):
if tokenizer_path is None:
tokenizer_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "sd1_tokenizer")
self.tokenizer = tokenizer_class.from_pretrained(tokenizer_path)
self.max_length = max_length
self.min_length = min_length
empty = self.tokenizer('')["input_ids"]
if has_start_token:
self.tokens_start = 1
self.start_token = empty[0]
self.end_token = empty[1]
else:
self.tokens_start = 0
self.start_token = None
self.end_token = empty[0]
if pad_token is not None:
self.pad_token = pad_token
elif pad_with_end:
self.pad_token = self.end_token
else:
self.pad_token = 0
self.pad_with_end = pad_with_end
self.pad_to_max_length = pad_to_max_length
vocab = self.tokenizer.get_vocab()
self.inv_vocab = {v: k for k, v in vocab.items()}
self.embedding_directory = embedding_directory
self.max_word_length = 8
self.embedding_identifier = "embedding:"
self.embedding_size = embedding_size
self.embedding_key = embedding_key
def _try_get_embedding(self, embedding_name:str):
'''
Takes a potential embedding name and tries to retrieve it.
Returns a Tuple consisting of the embedding and any leftover string, embedding can be None.
'''
embed = load_embed(embedding_name, self.embedding_directory, self.embedding_size, self.embedding_key)
if embed is None:
stripped = embedding_name.strip(',')
if len(stripped) < len(embedding_name):
embed = load_embed(stripped, self.embedding_directory, self.embedding_size, self.embedding_key)
return (embed, embedding_name[len(stripped):])
return (embed, "")
def tokenize_with_weights(self, text:str, return_word_ids=False):
'''
Takes a prompt and converts it to a list of (token, weight, word id) elements.
Tokens can both be integer tokens and pre computed CLIP tensors.
Word id values are unique per word and embedding, where the id 0 is reserved for non word tokens.
Returned list has the dimensions NxM where M is the input size of CLIP
'''
text = escape_important(text)
parsed_weights = token_weights(text, 1.0)
#tokenize words
tokens = []
for weighted_segment, weight in parsed_weights:
to_tokenize = unescape_important(weighted_segment).replace("\n", " ").split(' ')
to_tokenize = [x for x in to_tokenize if x != ""]
for word in to_tokenize:
#if we find an embedding, deal with the embedding
if word.startswith(self.embedding_identifier) and self.embedding_directory is not None:
embedding_name = word[len(self.embedding_identifier):].strip('\n')
embed, leftover = self._try_get_embedding(embedding_name)
if embed is None:
logging.warning(f"warning, embedding:{embedding_name} does not exist, ignoring")
else:
if len(embed.shape) == 1:
tokens.append([(embed, weight)])
else:
tokens.append([(embed[x], weight) for x in range(embed.shape[0])])
#if we accidentally have leftover text, continue parsing using leftover, else move on to next word
if leftover != "":
word = leftover
else:
continue
#parse word
tokens.append([(t, weight) for t in self.tokenizer(word)["input_ids"][self.tokens_start:-1]])
#reshape token array to CLIP input size
batched_tokens = []
batch = []
if self.start_token is not None:
batch.append((self.start_token, 1.0, 0))
batched_tokens.append(batch)
for i, t_group in enumerate(tokens):
#determine if we're going to try and keep the tokens in a single batch
is_large = len(t_group) >= self.max_word_length
while len(t_group) > 0:
if len(t_group) + len(batch) > self.max_length - 1:
remaining_length = self.max_length - len(batch) - 1
#break word in two and add end token
if is_large:
batch.extend([(t,w,i+1) for t,w in t_group[:remaining_length]])
batch.append((self.end_token, 1.0, 0))
t_group = t_group[remaining_length:]
#add end token and pad
else:
batch.append((self.end_token, 1.0, 0))
if self.pad_to_max_length:
batch.extend([(self.pad_token, 1.0, 0)] * (remaining_length))
#start new batch
batch = []
if self.start_token is not None:
batch.append((self.start_token, 1.0, 0))
batched_tokens.append(batch)
else:
batch.extend([(t,w,i+1) for t,w in t_group])
t_group = []
#fill last batch
batch.append((self.end_token, 1.0, 0))
if self.pad_to_max_length:
batch.extend([(self.pad_token, 1.0, 0)] * (self.max_length - len(batch)))
if self.min_length is not None and len(batch) < self.min_length:
batch.extend([(self.pad_token, 1.0, 0)] * (self.min_length - len(batch)))
if not return_word_ids:
batched_tokens = [[(t, w) for t, w,_ in x] for x in batched_tokens]
return batched_tokens
def untokenize(self, token_weight_pair):
return list(map(lambda a: (a, self.inv_vocab[a[0]]), token_weight_pair))
def state_dict(self):
return {}
class SD1Tokenizer:
def __init__(self, embedding_directory=None, tokenizer_data={}, clip_name="l", tokenizer=SDTokenizer):
self.clip_name = clip_name
self.clip = "clip_{}".format(self.clip_name)
setattr(self, self.clip, tokenizer(embedding_directory=embedding_directory, tokenizer_data=tokenizer_data))
def tokenize_with_weights(self, text:str, return_word_ids=False):
out = {}
out[self.clip_name] = getattr(self, self.clip).tokenize_with_weights(text, return_word_ids)
return out
def untokenize(self, token_weight_pair):
return getattr(self, self.clip).untokenize(token_weight_pair)
def state_dict(self):
return {}
class SD1ClipModel(torch.nn.Module):
def __init__(self, device="cpu", dtype=None, clip_name="l", clip_model=SDClipModel, name=None, **kwargs):
super().__init__()
if name is not None:
self.clip_name = name
self.clip = "{}".format(self.clip_name)
else:
self.clip_name = clip_name
self.clip = "clip_{}".format(self.clip_name)
setattr(self, self.clip, clip_model(device=device, dtype=dtype, **kwargs))
self.dtypes = set()
if dtype is not None:
self.dtypes.add(dtype)
def set_clip_options(self, options):
getattr(self, self.clip).set_clip_options(options)
def reset_clip_options(self):
getattr(self, self.clip).reset_clip_options()
def encode_token_weights(self, token_weight_pairs):
token_weight_pairs = token_weight_pairs[self.clip_name]
out = getattr(self, self.clip).encode_token_weights(token_weight_pairs)
return out
def load_sd(self, sd):
return getattr(self, self.clip).load_sd(sd)

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comfy/sd1_clip_config.json Normal file
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{
"_name_or_path": "openai/clip-vit-large-patch14",
"architectures": [
"CLIPTextModel"
],
"attention_dropout": 0.0,
"bos_token_id": 0,
"dropout": 0.0,
"eos_token_id": 49407,
"hidden_act": "quick_gelu",
"hidden_size": 768,
"initializer_factor": 1.0,
"initializer_range": 0.02,
"intermediate_size": 3072,
"layer_norm_eps": 1e-05,
"max_position_embeddings": 77,
"model_type": "clip_text_model",
"num_attention_heads": 12,
"num_hidden_layers": 12,
"pad_token_id": 1,
"projection_dim": 768,
"torch_dtype": "float32",
"transformers_version": "4.24.0",
"vocab_size": 49408
}

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comfy/sd1_tokenizer/special_tokens_map.json Normal file
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{
"bos_token": {
"content": "<|startoftext|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
},
"eos_token": {
"content": "<|endoftext|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
},
"pad_token": "<|endoftext|>",
"unk_token": {
"content": "<|endoftext|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
}
}

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comfy/sd1_tokenizer/tokenizer_config.json Normal file
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{
"add_prefix_space": false,
"bos_token": {
"__type": "AddedToken",
"content": "<|startoftext|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
},
"do_lower_case": true,
"eos_token": {
"__type": "AddedToken",
"content": "<|endoftext|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
},
"errors": "replace",
"model_max_length": 77,
"name_or_path": "openai/clip-vit-large-patch14",
"pad_token": "<|endoftext|>",
"special_tokens_map_file": "./special_tokens_map.json",
"tokenizer_class": "CLIPTokenizer",
"unk_token": {
"__type": "AddedToken",
"content": "<|endoftext|>",
"lstrip": false,
"normalized": true,
"rstrip": false,
"single_word": false
}
}

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comfy/sdxl_clip.py Normal file
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from comfy import sd1_clip
import torch
import os
class SDXLClipG(sd1_clip.SDClipModel):
def __init__(self, device="cpu", max_length=77, freeze=True, layer="penultimate", layer_idx=None, dtype=None):
if layer == "penultimate":
layer="hidden"
layer_idx=-2
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "clip_config_bigg.json")
super().__init__(device=device, freeze=freeze, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype,
special_tokens={"start": 49406, "end": 49407, "pad": 0}, layer_norm_hidden_state=False)
def load_sd(self, sd):
return super().load_sd(sd)
class SDXLClipGTokenizer(sd1_clip.SDTokenizer):
def __init__(self, tokenizer_path=None, embedding_directory=None, tokenizer_data={}):
super().__init__(tokenizer_path, pad_with_end=False, embedding_directory=embedding_directory, embedding_size=1280, embedding_key='clip_g')
class SDXLTokenizer:
def __init__(self, embedding_directory=None, tokenizer_data={}):
self.clip_l = sd1_clip.SDTokenizer(embedding_directory=embedding_directory)
self.clip_g = SDXLClipGTokenizer(embedding_directory=embedding_directory)
def tokenize_with_weights(self, text:str, return_word_ids=False):
out = {}
out["g"] = self.clip_g.tokenize_with_weights(text, return_word_ids)
out["l"] = self.clip_l.tokenize_with_weights(text, return_word_ids)
return out
def untokenize(self, token_weight_pair):
return self.clip_g.untokenize(token_weight_pair)
def state_dict(self):
return {}
class SDXLClipModel(torch.nn.Module):
def __init__(self, device="cpu", dtype=None):
super().__init__()
self.clip_l = sd1_clip.SDClipModel(layer="hidden", layer_idx=-2, device=device, dtype=dtype, layer_norm_hidden_state=False)
self.clip_g = SDXLClipG(device=device, dtype=dtype)
self.dtypes = set([dtype])
def set_clip_options(self, options):
self.clip_l.set_clip_options(options)
self.clip_g.set_clip_options(options)
def reset_clip_options(self):
self.clip_g.reset_clip_options()
self.clip_l.reset_clip_options()
def encode_token_weights(self, token_weight_pairs):
token_weight_pairs_g = token_weight_pairs["g"]
token_weight_pairs_l = token_weight_pairs["l"]
g_out, g_pooled = self.clip_g.encode_token_weights(token_weight_pairs_g)
l_out, l_pooled = self.clip_l.encode_token_weights(token_weight_pairs_l)
return torch.cat([l_out, g_out], dim=-1), g_pooled
def load_sd(self, sd):
if "text_model.encoder.layers.30.mlp.fc1.weight" in sd:
return self.clip_g.load_sd(sd)
else:
return self.clip_l.load_sd(sd)
class SDXLRefinerClipModel(sd1_clip.SD1ClipModel):
def __init__(self, device="cpu", dtype=None):
super().__init__(device=device, dtype=dtype, clip_name="g", clip_model=SDXLClipG)
class StableCascadeClipGTokenizer(sd1_clip.SDTokenizer):
def __init__(self, tokenizer_path=None, embedding_directory=None, tokenizer_data={}):
super().__init__(tokenizer_path, pad_with_end=True, embedding_directory=embedding_directory, embedding_size=1280, embedding_key='clip_g')
class StableCascadeTokenizer(sd1_clip.SD1Tokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
super().__init__(embedding_directory=embedding_directory, tokenizer_data=tokenizer_data, clip_name="g", tokenizer=StableCascadeClipGTokenizer)
class StableCascadeClipG(sd1_clip.SDClipModel):
def __init__(self, device="cpu", max_length=77, freeze=True, layer="hidden", layer_idx=-1, dtype=None):
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "clip_config_bigg.json")
super().__init__(device=device, freeze=freeze, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype,
special_tokens={"start": 49406, "end": 49407, "pad": 49407}, layer_norm_hidden_state=False, enable_attention_masks=True)
def load_sd(self, sd):
return super().load_sd(sd)
class StableCascadeClipModel(sd1_clip.SD1ClipModel):
def __init__(self, device="cpu", dtype=None):
super().__init__(device=device, dtype=dtype, clip_name="g", clip_model=StableCascadeClipG)

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import torch
from . import model_base
from . import utils
from . import sd1_clip
from . import sdxl_clip
import comfy.text_encoders.sd2_clip
import comfy.text_encoders.sd3_clip
import comfy.text_encoders.sa_t5
import comfy.text_encoders.aura_t5
import comfy.text_encoders.hydit
import comfy.text_encoders.flux
from . import supported_models_base
from . import latent_formats
from . import diffusers_convert
class SD15(supported_models_base.BASE):
unet_config = {
"context_dim": 768,
"model_channels": 320,
"use_linear_in_transformer": False,
"adm_in_channels": None,
"use_temporal_attention": False,
}
unet_extra_config = {
"num_heads": 8,
"num_head_channels": -1,
}
latent_format = latent_formats.SD15
def process_clip_state_dict(self, state_dict):
k = list(state_dict.keys())
for x in k:
if x.startswith("cond_stage_model.transformer.") and not x.startswith("cond_stage_model.transformer.text_model."):
y = x.replace("cond_stage_model.transformer.", "cond_stage_model.transformer.text_model.")
state_dict[y] = state_dict.pop(x)
if 'cond_stage_model.transformer.text_model.embeddings.position_ids' in state_dict:
ids = state_dict['cond_stage_model.transformer.text_model.embeddings.position_ids']
if ids.dtype == torch.float32:
state_dict['cond_stage_model.transformer.text_model.embeddings.position_ids'] = ids.round()
replace_prefix = {}
replace_prefix["cond_stage_model."] = "clip_l."
state_dict = utils.state_dict_prefix_replace(state_dict, replace_prefix, filter_keys=True)
return state_dict
def process_clip_state_dict_for_saving(self, state_dict):
pop_keys = ["clip_l.transformer.text_projection.weight", "clip_l.logit_scale"]
for p in pop_keys:
if p in state_dict:
state_dict.pop(p)
replace_prefix = {"clip_l.": "cond_stage_model."}
return utils.state_dict_prefix_replace(state_dict, replace_prefix)
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(sd1_clip.SD1Tokenizer, sd1_clip.SD1ClipModel)
class SD20(supported_models_base.BASE):
unet_config = {
"context_dim": 1024,
"model_channels": 320,
"use_linear_in_transformer": True,
"adm_in_channels": None,
"use_temporal_attention": False,
}
unet_extra_config = {
"num_heads": -1,
"num_head_channels": 64,
"attn_precision": torch.float32,
}
latent_format = latent_formats.SD15
def model_type(self, state_dict, prefix=""):
if self.unet_config["in_channels"] == 4: #SD2.0 inpainting models are not v prediction
k = "{}output_blocks.11.1.transformer_blocks.0.norm1.bias".format(prefix)
out = state_dict.get(k, None)
if out is not None and torch.std(out, unbiased=False) > 0.09: # not sure how well this will actually work. I guess we will find out.
return model_base.ModelType.V_PREDICTION
return model_base.ModelType.EPS
def process_clip_state_dict(self, state_dict):
replace_prefix = {}
replace_prefix["conditioner.embedders.0.model."] = "clip_h." #SD2 in sgm format
replace_prefix["cond_stage_model.model."] = "clip_h."
state_dict = utils.state_dict_prefix_replace(state_dict, replace_prefix, filter_keys=True)
state_dict = utils.clip_text_transformers_convert(state_dict, "clip_h.", "clip_h.transformer.")
return state_dict
def process_clip_state_dict_for_saving(self, state_dict):
replace_prefix = {}
replace_prefix["clip_h"] = "cond_stage_model.model"
state_dict = utils.state_dict_prefix_replace(state_dict, replace_prefix)
state_dict = diffusers_convert.convert_text_enc_state_dict_v20(state_dict)
return state_dict
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(comfy.text_encoders.sd2_clip.SD2Tokenizer, comfy.text_encoders.sd2_clip.SD2ClipModel)
class SD21UnclipL(SD20):
unet_config = {
"context_dim": 1024,
"model_channels": 320,
"use_linear_in_transformer": True,
"adm_in_channels": 1536,
"use_temporal_attention": False,
}
clip_vision_prefix = "embedder.model.visual."
noise_aug_config = {"noise_schedule_config": {"timesteps": 1000, "beta_schedule": "squaredcos_cap_v2"}, "timestep_dim": 768}
class SD21UnclipH(SD20):
unet_config = {
"context_dim": 1024,
"model_channels": 320,
"use_linear_in_transformer": True,
"adm_in_channels": 2048,
"use_temporal_attention": False,
}
clip_vision_prefix = "embedder.model.visual."
noise_aug_config = {"noise_schedule_config": {"timesteps": 1000, "beta_schedule": "squaredcos_cap_v2"}, "timestep_dim": 1024}
class SDXLRefiner(supported_models_base.BASE):
unet_config = {
"model_channels": 384,
"use_linear_in_transformer": True,
"context_dim": 1280,
"adm_in_channels": 2560,
"transformer_depth": [0, 0, 4, 4, 4, 4, 0, 0],
"use_temporal_attention": False,
}
latent_format = latent_formats.SDXL
def get_model(self, state_dict, prefix="", device=None):
return model_base.SDXLRefiner(self, device=device)
def process_clip_state_dict(self, state_dict):
keys_to_replace = {}
replace_prefix = {}
replace_prefix["conditioner.embedders.0.model."] = "clip_g."
state_dict = utils.state_dict_prefix_replace(state_dict, replace_prefix, filter_keys=True)
state_dict = utils.clip_text_transformers_convert(state_dict, "clip_g.", "clip_g.transformer.")
state_dict = utils.state_dict_key_replace(state_dict, keys_to_replace)
return state_dict
def process_clip_state_dict_for_saving(self, state_dict):
replace_prefix = {}
state_dict_g = diffusers_convert.convert_text_enc_state_dict_v20(state_dict, "clip_g")
if "clip_g.transformer.text_model.embeddings.position_ids" in state_dict_g:
state_dict_g.pop("clip_g.transformer.text_model.embeddings.position_ids")
replace_prefix["clip_g"] = "conditioner.embedders.0.model"
state_dict_g = utils.state_dict_prefix_replace(state_dict_g, replace_prefix)
return state_dict_g
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(sdxl_clip.SDXLTokenizer, sdxl_clip.SDXLRefinerClipModel)
class SDXL(supported_models_base.BASE):
unet_config = {
"model_channels": 320,
"use_linear_in_transformer": True,
"transformer_depth": [0, 0, 2, 2, 10, 10],
"context_dim": 2048,
"adm_in_channels": 2816,
"use_temporal_attention": False,
}
latent_format = latent_formats.SDXL
def model_type(self, state_dict, prefix=""):
if 'edm_mean' in state_dict and 'edm_std' in state_dict: #Playground V2.5
self.latent_format = latent_formats.SDXL_Playground_2_5()
self.sampling_settings["sigma_data"] = 0.5
self.sampling_settings["sigma_max"] = 80.0
self.sampling_settings["sigma_min"] = 0.002
return model_base.ModelType.EDM
elif "edm_vpred.sigma_max" in state_dict:
self.sampling_settings["sigma_max"] = float(state_dict["edm_vpred.sigma_max"].item())
if "edm_vpred.sigma_min" in state_dict:
self.sampling_settings["sigma_min"] = float(state_dict["edm_vpred.sigma_min"].item())
return model_base.ModelType.V_PREDICTION_EDM
elif "v_pred" in state_dict:
return model_base.ModelType.V_PREDICTION
else:
return model_base.ModelType.EPS
def get_model(self, state_dict, prefix="", device=None):
out = model_base.SDXL(self, model_type=self.model_type(state_dict, prefix), device=device)
if self.inpaint_model():
out.set_inpaint()
return out
def process_clip_state_dict(self, state_dict):
keys_to_replace = {}
replace_prefix = {}
replace_prefix["conditioner.embedders.0.transformer.text_model"] = "clip_l.transformer.text_model"
replace_prefix["conditioner.embedders.1.model."] = "clip_g."
state_dict = utils.state_dict_prefix_replace(state_dict, replace_prefix, filter_keys=True)
state_dict = utils.state_dict_key_replace(state_dict, keys_to_replace)
state_dict = utils.clip_text_transformers_convert(state_dict, "clip_g.", "clip_g.transformer.")
return state_dict
def process_clip_state_dict_for_saving(self, state_dict):
replace_prefix = {}
keys_to_replace = {}
state_dict_g = diffusers_convert.convert_text_enc_state_dict_v20(state_dict, "clip_g")
for k in state_dict:
if k.startswith("clip_l"):
state_dict_g[k] = state_dict[k]
state_dict_g["clip_l.transformer.text_model.embeddings.position_ids"] = torch.arange(77).expand((1, -1))
pop_keys = ["clip_l.transformer.text_projection.weight", "clip_l.logit_scale"]
for p in pop_keys:
if p in state_dict_g:
state_dict_g.pop(p)
replace_prefix["clip_g"] = "conditioner.embedders.1.model"
replace_prefix["clip_l"] = "conditioner.embedders.0"
state_dict_g = utils.state_dict_prefix_replace(state_dict_g, replace_prefix)
return state_dict_g
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(sdxl_clip.SDXLTokenizer, sdxl_clip.SDXLClipModel)
class SSD1B(SDXL):
unet_config = {
"model_channels": 320,
"use_linear_in_transformer": True,
"transformer_depth": [0, 0, 2, 2, 4, 4],
"context_dim": 2048,
"adm_in_channels": 2816,
"use_temporal_attention": False,
}
class Segmind_Vega(SDXL):
unet_config = {
"model_channels": 320,
"use_linear_in_transformer": True,
"transformer_depth": [0, 0, 1, 1, 2, 2],
"context_dim": 2048,
"adm_in_channels": 2816,
"use_temporal_attention": False,
}
class KOALA_700M(SDXL):
unet_config = {
"model_channels": 320,
"use_linear_in_transformer": True,
"transformer_depth": [0, 2, 5],
"context_dim": 2048,
"adm_in_channels": 2816,
"use_temporal_attention": False,
}
class KOALA_1B(SDXL):
unet_config = {
"model_channels": 320,
"use_linear_in_transformer": True,
"transformer_depth": [0, 2, 6],
"context_dim": 2048,
"adm_in_channels": 2816,
"use_temporal_attention": False,
}
class SVD_img2vid(supported_models_base.BASE):
unet_config = {
"model_channels": 320,
"in_channels": 8,
"use_linear_in_transformer": True,
"transformer_depth": [1, 1, 1, 1, 1, 1, 0, 0],
"context_dim": 1024,
"adm_in_channels": 768,
"use_temporal_attention": True,
"use_temporal_resblock": True
}
unet_extra_config = {
"num_heads": -1,
"num_head_channels": 64,
"attn_precision": torch.float32,
}
clip_vision_prefix = "conditioner.embedders.0.open_clip.model.visual."
latent_format = latent_formats.SD15
sampling_settings = {"sigma_max": 700.0, "sigma_min": 0.002}
def get_model(self, state_dict, prefix="", device=None):
out = model_base.SVD_img2vid(self, device=device)
return out
def clip_target(self, state_dict={}):
return None
class SV3D_u(SVD_img2vid):
unet_config = {
"model_channels": 320,
"in_channels": 8,
"use_linear_in_transformer": True,
"transformer_depth": [1, 1, 1, 1, 1, 1, 0, 0],
"context_dim": 1024,
"adm_in_channels": 256,
"use_temporal_attention": True,
"use_temporal_resblock": True
}
vae_key_prefix = ["conditioner.embedders.1.encoder."]
def get_model(self, state_dict, prefix="", device=None):
out = model_base.SV3D_u(self, device=device)
return out
class SV3D_p(SV3D_u):
unet_config = {
"model_channels": 320,
"in_channels": 8,
"use_linear_in_transformer": True,
"transformer_depth": [1, 1, 1, 1, 1, 1, 0, 0],
"context_dim": 1024,
"adm_in_channels": 1280,
"use_temporal_attention": True,
"use_temporal_resblock": True
}
def get_model(self, state_dict, prefix="", device=None):
out = model_base.SV3D_p(self, device=device)
return out
class Stable_Zero123(supported_models_base.BASE):
unet_config = {
"context_dim": 768,
"model_channels": 320,
"use_linear_in_transformer": False,
"adm_in_channels": None,
"use_temporal_attention": False,
"in_channels": 8,
}
unet_extra_config = {
"num_heads": 8,
"num_head_channels": -1,
}
required_keys = {
"cc_projection.weight": None,
"cc_projection.bias": None,
}
clip_vision_prefix = "cond_stage_model.model.visual."
latent_format = latent_formats.SD15
def get_model(self, state_dict, prefix="", device=None):
out = model_base.Stable_Zero123(self, device=device, cc_projection_weight=state_dict["cc_projection.weight"], cc_projection_bias=state_dict["cc_projection.bias"])
return out
def clip_target(self, state_dict={}):
return None
class SD_X4Upscaler(SD20):
unet_config = {
"context_dim": 1024,
"model_channels": 256,
'in_channels': 7,
"use_linear_in_transformer": True,
"adm_in_channels": None,
"use_temporal_attention": False,
}
unet_extra_config = {
"disable_self_attentions": [True, True, True, False],
"num_classes": 1000,
"num_heads": 8,
"num_head_channels": -1,
}
latent_format = latent_formats.SD_X4
sampling_settings = {
"linear_start": 0.0001,
"linear_end": 0.02,
}
def get_model(self, state_dict, prefix="", device=None):
out = model_base.SD_X4Upscaler(self, device=device)
return out
class Stable_Cascade_C(supported_models_base.BASE):
unet_config = {
"stable_cascade_stage": 'c',
}
unet_extra_config = {}
latent_format = latent_formats.SC_Prior
supported_inference_dtypes = [torch.bfloat16, torch.float32]
sampling_settings = {
"shift": 2.0,
}
vae_key_prefix = ["vae."]
text_encoder_key_prefix = ["text_encoder."]
clip_vision_prefix = "clip_l_vision."
def process_unet_state_dict(self, state_dict):
key_list = list(state_dict.keys())
for y in ["weight", "bias"]:
suffix = "in_proj_{}".format(y)
keys = filter(lambda a: a.endswith(suffix), key_list)
for k_from in keys:
weights = state_dict.pop(k_from)
prefix = k_from[:-(len(suffix) + 1)]
shape_from = weights.shape[0] // 3
for x in range(3):
p = ["to_q", "to_k", "to_v"]
k_to = "{}.{}.{}".format(prefix, p[x], y)
state_dict[k_to] = weights[shape_from*x:shape_from*(x + 1)]
return state_dict
def process_clip_state_dict(self, state_dict):
state_dict = utils.state_dict_prefix_replace(state_dict, {k: "" for k in self.text_encoder_key_prefix}, filter_keys=True)
if "clip_g.text_projection" in state_dict:
state_dict["clip_g.transformer.text_projection.weight"] = state_dict.pop("clip_g.text_projection").transpose(0, 1)
return state_dict
def get_model(self, state_dict, prefix="", device=None):
out = model_base.StableCascade_C(self, device=device)
return out
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(sdxl_clip.StableCascadeTokenizer, sdxl_clip.StableCascadeClipModel)
class Stable_Cascade_B(Stable_Cascade_C):
unet_config = {
"stable_cascade_stage": 'b',
}
unet_extra_config = {}
latent_format = latent_formats.SC_B
supported_inference_dtypes = [torch.float16, torch.bfloat16, torch.float32]
sampling_settings = {
"shift": 1.0,
}
clip_vision_prefix = None
def get_model(self, state_dict, prefix="", device=None):
out = model_base.StableCascade_B(self, device=device)
return out
class SD15_instructpix2pix(SD15):
unet_config = {
"context_dim": 768,
"model_channels": 320,
"use_linear_in_transformer": False,
"adm_in_channels": None,
"use_temporal_attention": False,
"in_channels": 8,
}
def get_model(self, state_dict, prefix="", device=None):
return model_base.SD15_instructpix2pix(self, device=device)
class SDXL_instructpix2pix(SDXL):
unet_config = {
"model_channels": 320,
"use_linear_in_transformer": True,
"transformer_depth": [0, 0, 2, 2, 10, 10],
"context_dim": 2048,
"adm_in_channels": 2816,
"use_temporal_attention": False,
"in_channels": 8,
}
def get_model(self, state_dict, prefix="", device=None):
return model_base.SDXL_instructpix2pix(self, model_type=self.model_type(state_dict, prefix), device=device)
class SD3(supported_models_base.BASE):
unet_config = {
"in_channels": 16,
"pos_embed_scaling_factor": None,
}
sampling_settings = {
"shift": 3.0,
}
unet_extra_config = {}
latent_format = latent_formats.SD3
text_encoder_key_prefix = ["text_encoders."]
def get_model(self, state_dict, prefix="", device=None):
out = model_base.SD3(self, device=device)
return out
def clip_target(self, state_dict={}):
clip_l = False
clip_g = False
t5 = False
dtype_t5 = None
pref = self.text_encoder_key_prefix[0]
if "{}clip_l.transformer.text_model.final_layer_norm.weight".format(pref) in state_dict:
clip_l = True
if "{}clip_g.transformer.text_model.final_layer_norm.weight".format(pref) in state_dict:
clip_g = True
t5_key = "{}t5xxl.transformer.encoder.final_layer_norm.weight".format(pref)
if t5_key in state_dict:
t5 = True
dtype_t5 = state_dict[t5_key].dtype
return supported_models_base.ClipTarget(comfy.text_encoders.sd3_clip.SD3Tokenizer, comfy.text_encoders.sd3_clip.sd3_clip(clip_l=clip_l, clip_g=clip_g, t5=t5, dtype_t5=dtype_t5))
class StableAudio(supported_models_base.BASE):
unet_config = {
"audio_model": "dit1.0",
}
sampling_settings = {"sigma_max": 500.0, "sigma_min": 0.03}
unet_extra_config = {}
latent_format = latent_formats.StableAudio1
text_encoder_key_prefix = ["text_encoders."]
vae_key_prefix = ["pretransform.model."]
def get_model(self, state_dict, prefix="", device=None):
seconds_start_sd = utils.state_dict_prefix_replace(state_dict, {"conditioner.conditioners.seconds_start.": ""}, filter_keys=True)
seconds_total_sd = utils.state_dict_prefix_replace(state_dict, {"conditioner.conditioners.seconds_total.": ""}, filter_keys=True)
return model_base.StableAudio1(self, seconds_start_embedder_weights=seconds_start_sd, seconds_total_embedder_weights=seconds_total_sd, device=device)
def process_unet_state_dict(self, state_dict):
for k in list(state_dict.keys()):
if k.endswith(".cross_attend_norm.beta") or k.endswith(".ff_norm.beta") or k.endswith(".pre_norm.beta"): #These weights are all zero
state_dict.pop(k)
return state_dict
def process_unet_state_dict_for_saving(self, state_dict):
replace_prefix = {"": "model.model."}
return utils.state_dict_prefix_replace(state_dict, replace_prefix)
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(comfy.text_encoders.sa_t5.SAT5Tokenizer, comfy.text_encoders.sa_t5.SAT5Model)
class AuraFlow(supported_models_base.BASE):
unet_config = {
"cond_seq_dim": 2048,
}
sampling_settings = {
"multiplier": 1.0,
"shift": 1.73,
}
unet_extra_config = {}
latent_format = latent_formats.SDXL
vae_key_prefix = ["vae."]
text_encoder_key_prefix = ["text_encoders."]
def get_model(self, state_dict, prefix="", device=None):
out = model_base.AuraFlow(self, device=device)
return out
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(comfy.text_encoders.aura_t5.AuraT5Tokenizer, comfy.text_encoders.aura_t5.AuraT5Model)
class HunyuanDiT(supported_models_base.BASE):
unet_config = {
"image_model": "hydit",
}
unet_extra_config = {
"attn_precision": torch.float32,
}
sampling_settings = {
"linear_start": 0.00085,
"linear_end": 0.018,
}
latent_format = latent_formats.SDXL
vae_key_prefix = ["vae."]
text_encoder_key_prefix = ["text_encoders."]
def get_model(self, state_dict, prefix="", device=None):
out = model_base.HunyuanDiT(self, device=device)
return out
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(comfy.text_encoders.hydit.HyditTokenizer, comfy.text_encoders.hydit.HyditModel)
class HunyuanDiT1(HunyuanDiT):
unet_config = {
"image_model": "hydit1",
}
unet_extra_config = {}
sampling_settings = {
"linear_start" : 0.00085,
"linear_end" : 0.03,
}
class Flux(supported_models_base.BASE):
unet_config = {
"image_model": "flux",
"guidance_embed": True,
}
sampling_settings = {
}
unet_extra_config = {}
latent_format = latent_formats.Flux
supported_inference_dtypes = [torch.bfloat16, torch.float32]
vae_key_prefix = ["vae."]
text_encoder_key_prefix = ["text_encoders."]
def get_model(self, state_dict, prefix="", device=None):
out = model_base.Flux(self, device=device)
return out
def clip_target(self, state_dict={}):
return supported_models_base.ClipTarget(comfy.text_encoders.flux.FluxTokenizer, comfy.text_encoders.flux.FluxClipModel)
class FluxSchnell(Flux):
unet_config = {
"image_model": "flux",
"guidance_embed": False,
}
sampling_settings = {
"multiplier": 1.0,
"shift": 1.0,
}
def get_model(self, state_dict, prefix="", device=None):
out = model_base.Flux(self, model_type=model_base.ModelType.FLOW, device=device)
return out
models = [Stable_Zero123, SD15_instructpix2pix, SD15, SD20, SD21UnclipL, SD21UnclipH, SDXL_instructpix2pix, SDXLRefiner, SDXL, SSD1B, KOALA_700M, KOALA_1B, Segmind_Vega, SD_X4Upscaler, Stable_Cascade_C, Stable_Cascade_B, SV3D_u, SV3D_p, SD3, StableAudio, AuraFlow, HunyuanDiT, HunyuanDiT1, Flux, FluxSchnell]
models += [SVD_img2vid]

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import torch
from . import model_base
from . import utils
from . import latent_formats
class ClipTarget:
def __init__(self, tokenizer, clip):
self.clip = clip
self.tokenizer = tokenizer
self.params = {}
class BASE:
unet_config = {}
unet_extra_config = {
"num_heads": -1,
"num_head_channels": 64,
}
required_keys = {}
clip_prefix = []
clip_vision_prefix = None
noise_aug_config = None
sampling_settings = {}
latent_format = latent_formats.LatentFormat
vae_key_prefix = ["first_stage_model."]
text_encoder_key_prefix = ["cond_stage_model."]
supported_inference_dtypes = [torch.float16, torch.bfloat16, torch.float32]
manual_cast_dtype = None
@classmethod
def matches(s, unet_config, state_dict=None):
for k in s.unet_config:
if k not in unet_config or s.unet_config[k] != unet_config[k]:
return False
if state_dict is not None:
for k in s.required_keys:
if k not in state_dict:
return False
return True
def model_type(self, state_dict, prefix=""):
return model_base.ModelType.EPS
def inpaint_model(self):
return self.unet_config["in_channels"] > 4
def __init__(self, unet_config):
self.unet_config = unet_config.copy()
self.sampling_settings = self.sampling_settings.copy()
self.latent_format = self.latent_format()
for x in self.unet_extra_config:
self.unet_config[x] = self.unet_extra_config[x]
def get_model(self, state_dict, prefix="", device=None):
if self.noise_aug_config is not None:
out = model_base.SD21UNCLIP(self, self.noise_aug_config, model_type=self.model_type(state_dict, prefix), device=device)
else:
out = model_base.BaseModel(self, model_type=self.model_type(state_dict, prefix), device=device)
if self.inpaint_model():
out.set_inpaint()
return out
def process_clip_state_dict(self, state_dict):
state_dict = utils.state_dict_prefix_replace(state_dict, {k: "" for k in self.text_encoder_key_prefix}, filter_keys=True)
return state_dict
def process_unet_state_dict(self, state_dict):
return state_dict
def process_vae_state_dict(self, state_dict):
return state_dict
def process_clip_state_dict_for_saving(self, state_dict):
replace_prefix = {"": self.text_encoder_key_prefix[0]}
return utils.state_dict_prefix_replace(state_dict, replace_prefix)
def process_clip_vision_state_dict_for_saving(self, state_dict):
replace_prefix = {}
if self.clip_vision_prefix is not None:
replace_prefix[""] = self.clip_vision_prefix
return utils.state_dict_prefix_replace(state_dict, replace_prefix)
def process_unet_state_dict_for_saving(self, state_dict):
replace_prefix = {"": "model.diffusion_model."}
return utils.state_dict_prefix_replace(state_dict, replace_prefix)
def process_vae_state_dict_for_saving(self, state_dict):
replace_prefix = {"": self.vae_key_prefix[0]}
return utils.state_dict_prefix_replace(state_dict, replace_prefix)
def set_inference_dtype(self, dtype, manual_cast_dtype):
self.unet_config['dtype'] = dtype
self.manual_cast_dtype = manual_cast_dtype

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#taken from https://github.com/TencentARC/T2I-Adapter
import torch
import torch.nn as nn
from collections import OrderedDict
def conv_nd(dims, *args, **kwargs):
"""
Create a 1D, 2D, or 3D convolution module.
"""
if dims == 1:
return nn.Conv1d(*args, **kwargs)
elif dims == 2:
return nn.Conv2d(*args, **kwargs)
elif dims == 3:
return nn.Conv3d(*args, **kwargs)
raise ValueError(f"unsupported dimensions: {dims}")
def avg_pool_nd(dims, *args, **kwargs):
"""
Create a 1D, 2D, or 3D average pooling module.
"""
if dims == 1:
return nn.AvgPool1d(*args, **kwargs)
elif dims == 2:
return nn.AvgPool2d(*args, **kwargs)
elif dims == 3:
return nn.AvgPool3d(*args, **kwargs)
raise ValueError(f"unsupported dimensions: {dims}")
class Downsample(nn.Module):
"""
A downsampling layer with an optional convolution.
:param channels: channels in the inputs and outputs.
:param use_conv: a bool determining if a convolution is applied.
:param dims: determines if the signal is 1D, 2D, or 3D. If 3D, then
downsampling occurs in the inner-two dimensions.
"""
def __init__(self, channels, use_conv, dims=2, out_channels=None, padding=1):
super().__init__()
self.channels = channels
self.out_channels = out_channels or channels
self.use_conv = use_conv
self.dims = dims
stride = 2 if dims != 3 else (1, 2, 2)
if use_conv:
self.op = conv_nd(
dims, self.channels, self.out_channels, 3, stride=stride, padding=padding
)
else:
assert self.channels == self.out_channels
self.op = avg_pool_nd(dims, kernel_size=stride, stride=stride)
def forward(self, x):
assert x.shape[1] == self.channels
if not self.use_conv:
padding = [x.shape[2] % 2, x.shape[3] % 2]
self.op.padding = padding
x = self.op(x)
return x
class ResnetBlock(nn.Module):
def __init__(self, in_c, out_c, down, ksize=3, sk=False, use_conv=True):
super().__init__()
ps = ksize // 2
if in_c != out_c or sk == False:
self.in_conv = nn.Conv2d(in_c, out_c, ksize, 1, ps)
else:
# print('n_in')
self.in_conv = None
self.block1 = nn.Conv2d(out_c, out_c, 3, 1, 1)
self.act = nn.ReLU()
self.block2 = nn.Conv2d(out_c, out_c, ksize, 1, ps)
if sk == False:
self.skep = nn.Conv2d(in_c, out_c, ksize, 1, ps)
else:
self.skep = None
self.down = down
if self.down == True:
self.down_opt = Downsample(in_c, use_conv=use_conv)
def forward(self, x):
if self.down == True:
x = self.down_opt(x)
if self.in_conv is not None: # edit
x = self.in_conv(x)
h = self.block1(x)
h = self.act(h)
h = self.block2(h)
if self.skep is not None:
return h + self.skep(x)
else:
return h + x
class Adapter(nn.Module):
def __init__(self, channels=[320, 640, 1280, 1280], nums_rb=3, cin=64, ksize=3, sk=False, use_conv=True, xl=True):
super(Adapter, self).__init__()
self.unshuffle_amount = 8
resblock_no_downsample = []
resblock_downsample = [3, 2, 1]
self.xl = xl
if self.xl:
self.unshuffle_amount = 16
resblock_no_downsample = [1]
resblock_downsample = [2]
self.input_channels = cin // (self.unshuffle_amount * self.unshuffle_amount)
self.unshuffle = nn.PixelUnshuffle(self.unshuffle_amount)
self.channels = channels
self.nums_rb = nums_rb
self.body = []
for i in range(len(channels)):
for j in range(nums_rb):
if (i in resblock_downsample) and (j == 0):
self.body.append(
ResnetBlock(channels[i - 1], channels[i], down=True, ksize=ksize, sk=sk, use_conv=use_conv))
elif (i in resblock_no_downsample) and (j == 0):
self.body.append(
ResnetBlock(channels[i - 1], channels[i], down=False, ksize=ksize, sk=sk, use_conv=use_conv))
else:
self.body.append(
ResnetBlock(channels[i], channels[i], down=False, ksize=ksize, sk=sk, use_conv=use_conv))
self.body = nn.ModuleList(self.body)
self.conv_in = nn.Conv2d(cin, channels[0], 3, 1, 1)
def forward(self, x):
# unshuffle
x = self.unshuffle(x)
# extract features
features = []
x = self.conv_in(x)
for i in range(len(self.channels)):
for j in range(self.nums_rb):
idx = i * self.nums_rb + j
x = self.body[idx](x)
if self.xl:
features.append(None)
if i == 0:
features.append(None)
features.append(None)
if i == 2:
features.append(None)
else:
features.append(None)
features.append(None)
features.append(x)
features = features[::-1]
if self.xl:
return {"input": features[1:], "middle": features[:1]}
else:
return {"input": features}
class LayerNorm(nn.LayerNorm):
"""Subclass torch's LayerNorm to handle fp16."""
def forward(self, x: torch.Tensor):
orig_type = x.dtype
ret = super().forward(x.type(torch.float32))
return ret.type(orig_type)
class QuickGELU(nn.Module):
def forward(self, x: torch.Tensor):
return x * torch.sigmoid(1.702 * x)
class ResidualAttentionBlock(nn.Module):
def __init__(self, d_model: int, n_head: int, attn_mask: torch.Tensor = None):
super().__init__()
self.attn = nn.MultiheadAttention(d_model, n_head)
self.ln_1 = LayerNorm(d_model)
self.mlp = nn.Sequential(
OrderedDict([("c_fc", nn.Linear(d_model, d_model * 4)), ("gelu", QuickGELU()),
("c_proj", nn.Linear(d_model * 4, d_model))]))
self.ln_2 = LayerNorm(d_model)
self.attn_mask = attn_mask
def attention(self, x: torch.Tensor):
self.attn_mask = self.attn_mask.to(dtype=x.dtype, device=x.device) if self.attn_mask is not None else None
return self.attn(x, x, x, need_weights=False, attn_mask=self.attn_mask)[0]
def forward(self, x: torch.Tensor):
x = x + self.attention(self.ln_1(x))
x = x + self.mlp(self.ln_2(x))
return x
class StyleAdapter(nn.Module):
def __init__(self, width=1024, context_dim=768, num_head=8, n_layes=3, num_token=4):
super().__init__()
scale = width ** -0.5
self.transformer_layes = nn.Sequential(*[ResidualAttentionBlock(width, num_head) for _ in range(n_layes)])
self.num_token = num_token
self.style_embedding = nn.Parameter(torch.randn(1, num_token, width) * scale)
self.ln_post = LayerNorm(width)
self.ln_pre = LayerNorm(width)
self.proj = nn.Parameter(scale * torch.randn(width, context_dim))
def forward(self, x):
# x shape [N, HW+1, C]
style_embedding = self.style_embedding + torch.zeros(
(x.shape[0], self.num_token, self.style_embedding.shape[-1]), device=x.device)
x = torch.cat([x, style_embedding], dim=1)
x = self.ln_pre(x)
x = x.permute(1, 0, 2) # NLD -> LND
x = self.transformer_layes(x)
x = x.permute(1, 0, 2) # LND -> NLD
x = self.ln_post(x[:, -self.num_token:, :])
x = x @ self.proj
return x
class ResnetBlock_light(nn.Module):
def __init__(self, in_c):
super().__init__()
self.block1 = nn.Conv2d(in_c, in_c, 3, 1, 1)
self.act = nn.ReLU()
self.block2 = nn.Conv2d(in_c, in_c, 3, 1, 1)
def forward(self, x):
h = self.block1(x)
h = self.act(h)
h = self.block2(h)
return h + x
class extractor(nn.Module):
def __init__(self, in_c, inter_c, out_c, nums_rb, down=False):
super().__init__()
self.in_conv = nn.Conv2d(in_c, inter_c, 1, 1, 0)
self.body = []
for _ in range(nums_rb):
self.body.append(ResnetBlock_light(inter_c))
self.body = nn.Sequential(*self.body)
self.out_conv = nn.Conv2d(inter_c, out_c, 1, 1, 0)
self.down = down
if self.down == True:
self.down_opt = Downsample(in_c, use_conv=False)
def forward(self, x):
if self.down == True:
x = self.down_opt(x)
x = self.in_conv(x)
x = self.body(x)
x = self.out_conv(x)
return x
class Adapter_light(nn.Module):
def __init__(self, channels=[320, 640, 1280, 1280], nums_rb=3, cin=64):
super(Adapter_light, self).__init__()
self.unshuffle_amount = 8
self.unshuffle = nn.PixelUnshuffle(self.unshuffle_amount)
self.input_channels = cin // (self.unshuffle_amount * self.unshuffle_amount)
self.channels = channels
self.nums_rb = nums_rb
self.body = []
self.xl = False
for i in range(len(channels)):
if i == 0:
self.body.append(extractor(in_c=cin, inter_c=channels[i]//4, out_c=channels[i], nums_rb=nums_rb, down=False))
else:
self.body.append(extractor(in_c=channels[i-1], inter_c=channels[i]//4, out_c=channels[i], nums_rb=nums_rb, down=True))
self.body = nn.ModuleList(self.body)
def forward(self, x):
# unshuffle
x = self.unshuffle(x)
# extract features
features = []
for i in range(len(self.channels)):
x = self.body[i](x)
features.append(None)
features.append(None)
features.append(x)
return {"input": features[::-1]}

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#!/usr/bin/env python3
"""
Tiny AutoEncoder for Stable Diffusion
(DNN for encoding / decoding SD's latent space)
"""
import torch
import torch.nn as nn
import comfy.utils
import comfy.ops
def conv(n_in, n_out, **kwargs):
return comfy.ops.disable_weight_init.Conv2d(n_in, n_out, 3, padding=1, **kwargs)
class Clamp(nn.Module):
def forward(self, x):
return torch.tanh(x / 3) * 3
class Block(nn.Module):
def __init__(self, n_in, n_out):
super().__init__()
self.conv = nn.Sequential(conv(n_in, n_out), nn.ReLU(), conv(n_out, n_out), nn.ReLU(), conv(n_out, n_out))
self.skip = comfy.ops.disable_weight_init.Conv2d(n_in, n_out, 1, bias=False) if n_in != n_out else nn.Identity()
self.fuse = nn.ReLU()
def forward(self, x):
return self.fuse(self.conv(x) + self.skip(x))
def Encoder(latent_channels=4):
return nn.Sequential(
conv(3, 64), Block(64, 64),
conv(64, 64, stride=2, bias=False), Block(64, 64), Block(64, 64), Block(64, 64),
conv(64, 64, stride=2, bias=False), Block(64, 64), Block(64, 64), Block(64, 64),
conv(64, 64, stride=2, bias=False), Block(64, 64), Block(64, 64), Block(64, 64),
conv(64, latent_channels),
)
def Decoder(latent_channels=4):
return nn.Sequential(
Clamp(), conv(latent_channels, 64), nn.ReLU(),
Block(64, 64), Block(64, 64), Block(64, 64), nn.Upsample(scale_factor=2), conv(64, 64, bias=False),
Block(64, 64), Block(64, 64), Block(64, 64), nn.Upsample(scale_factor=2), conv(64, 64, bias=False),
Block(64, 64), Block(64, 64), Block(64, 64), nn.Upsample(scale_factor=2), conv(64, 64, bias=False),
Block(64, 64), conv(64, 3),
)
class TAESD(nn.Module):
latent_magnitude = 3
latent_shift = 0.5
def __init__(self, encoder_path=None, decoder_path=None, latent_channels=4):
"""Initialize pretrained TAESD on the given device from the given checkpoints."""
super().__init__()
self.taesd_encoder = Encoder(latent_channels=latent_channels)
self.taesd_decoder = Decoder(latent_channels=latent_channels)
self.vae_scale = torch.nn.Parameter(torch.tensor(1.0))
self.vae_shift = torch.nn.Parameter(torch.tensor(0.0))
if encoder_path is not None:
self.taesd_encoder.load_state_dict(comfy.utils.load_torch_file(encoder_path, safe_load=True))
if decoder_path is not None:
self.taesd_decoder.load_state_dict(comfy.utils.load_torch_file(decoder_path, safe_load=True))
@staticmethod
def scale_latents(x):
"""raw latents -> [0, 1]"""
return x.div(2 * TAESD.latent_magnitude).add(TAESD.latent_shift).clamp(0, 1)
@staticmethod
def unscale_latents(x):
"""[0, 1] -> raw latents"""
return x.sub(TAESD.latent_shift).mul(2 * TAESD.latent_magnitude)
def decode(self, x):
x_sample = self.taesd_decoder((x - self.vae_shift) * self.vae_scale)
x_sample = x_sample.sub(0.5).mul(2)
return x_sample
def encode(self, x):
return (self.taesd_encoder(x * 0.5 + 0.5) / self.vae_scale) + self.vae_shift

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comfy/text_encoders/aura_t5.py Normal file
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from comfy import sd1_clip
from .spiece_tokenizer import SPieceTokenizer
import comfy.text_encoders.t5
import os
class PT5XlModel(sd1_clip.SDClipModel):
def __init__(self, device="cpu", layer="last", layer_idx=None, dtype=None):
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_pile_config_xl.json")
super().__init__(device=device, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype, special_tokens={"end": 2, "pad": 1}, model_class=comfy.text_encoders.t5.T5, enable_attention_masks=True, zero_out_masked=True)
class PT5XlTokenizer(sd1_clip.SDTokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
tokenizer_path = os.path.join(os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_pile_tokenizer"), "tokenizer.model")
super().__init__(tokenizer_path, pad_with_end=False, embedding_size=2048, embedding_key='pile_t5xl', tokenizer_class=SPieceTokenizer, has_start_token=False, pad_to_max_length=False, max_length=99999999, min_length=256, pad_token=1)
class AuraT5Tokenizer(sd1_clip.SD1Tokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
super().__init__(embedding_directory=embedding_directory, tokenizer_data=tokenizer_data, clip_name="pile_t5xl", tokenizer=PT5XlTokenizer)
class AuraT5Model(sd1_clip.SD1ClipModel):
def __init__(self, device="cpu", dtype=None, **kwargs):
super().__init__(device=device, dtype=dtype, name="pile_t5xl", clip_model=PT5XlModel, **kwargs)

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import torch
from comfy.ldm.modules.attention import optimized_attention_for_device
import comfy.ops
class BertAttention(torch.nn.Module):
def __init__(self, embed_dim, heads, dtype, device, operations):
super().__init__()
self.heads = heads
self.query = operations.Linear(embed_dim, embed_dim, bias=True, dtype=dtype, device=device)
self.key = operations.Linear(embed_dim, embed_dim, bias=True, dtype=dtype, device=device)
self.value = operations.Linear(embed_dim, embed_dim, bias=True, dtype=dtype, device=device)
def forward(self, x, mask=None, optimized_attention=None):
q = self.query(x)
k = self.key(x)
v = self.value(x)
out = optimized_attention(q, k, v, self.heads, mask)
return out
class BertOutput(torch.nn.Module):
def __init__(self, input_dim, output_dim, layer_norm_eps, dtype, device, operations):
super().__init__()
self.dense = operations.Linear(input_dim, output_dim, dtype=dtype, device=device)
self.LayerNorm = operations.LayerNorm(output_dim, eps=layer_norm_eps, dtype=dtype, device=device)
# self.dropout = nn.Dropout(0.0)
def forward(self, x, y):
x = self.dense(x)
# hidden_states = self.dropout(hidden_states)
x = self.LayerNorm(x + y)
return x
class BertAttentionBlock(torch.nn.Module):
def __init__(self, embed_dim, heads, layer_norm_eps, dtype, device, operations):
super().__init__()
self.self = BertAttention(embed_dim, heads, dtype, device, operations)
self.output = BertOutput(embed_dim, embed_dim, layer_norm_eps, dtype, device, operations)
def forward(self, x, mask, optimized_attention):
y = self.self(x, mask, optimized_attention)
return self.output(y, x)
class BertIntermediate(torch.nn.Module):
def __init__(self, embed_dim, intermediate_dim, dtype, device, operations):
super().__init__()
self.dense = operations.Linear(embed_dim, intermediate_dim, dtype=dtype, device=device)
def forward(self, x):
x = self.dense(x)
return torch.nn.functional.gelu(x)
class BertBlock(torch.nn.Module):
def __init__(self, embed_dim, intermediate_dim, heads, layer_norm_eps, dtype, device, operations):
super().__init__()
self.attention = BertAttentionBlock(embed_dim, heads, layer_norm_eps, dtype, device, operations)
self.intermediate = BertIntermediate(embed_dim, intermediate_dim, dtype, device, operations)
self.output = BertOutput(intermediate_dim, embed_dim, layer_norm_eps, dtype, device, operations)
def forward(self, x, mask, optimized_attention):
x = self.attention(x, mask, optimized_attention)
y = self.intermediate(x)
return self.output(y, x)
class BertEncoder(torch.nn.Module):
def __init__(self, num_layers, embed_dim, intermediate_dim, heads, layer_norm_eps, dtype, device, operations):
super().__init__()
self.layer = torch.nn.ModuleList([BertBlock(embed_dim, intermediate_dim, heads, layer_norm_eps, dtype, device, operations) for i in range(num_layers)])
def forward(self, x, mask=None, intermediate_output=None):
optimized_attention = optimized_attention_for_device(x.device, mask=mask is not None, small_input=True)
if intermediate_output is not None:
if intermediate_output < 0:
intermediate_output = len(self.layer) + intermediate_output
intermediate = None
for i, l in enumerate(self.layer):
x = l(x, mask, optimized_attention)
if i == intermediate_output:
intermediate = x.clone()
return x, intermediate
class BertEmbeddings(torch.nn.Module):
def __init__(self, vocab_size, max_position_embeddings, type_vocab_size, pad_token_id, embed_dim, layer_norm_eps, dtype, device, operations):
super().__init__()
self.word_embeddings = operations.Embedding(vocab_size, embed_dim, padding_idx=pad_token_id, dtype=dtype, device=device)
self.position_embeddings = operations.Embedding(max_position_embeddings, embed_dim, dtype=dtype, device=device)
self.token_type_embeddings = operations.Embedding(type_vocab_size, embed_dim, dtype=dtype, device=device)
self.LayerNorm = operations.LayerNorm(embed_dim, eps=layer_norm_eps, dtype=dtype, device=device)
def forward(self, input_tokens, token_type_ids=None, dtype=None):
x = self.word_embeddings(input_tokens, out_dtype=dtype)
x += comfy.ops.cast_to_input(self.position_embeddings.weight[:x.shape[1]], x)
if token_type_ids is not None:
x += self.token_type_embeddings(token_type_ids, out_dtype=x.dtype)
else:
x += comfy.ops.cast_to_input(self.token_type_embeddings.weight[0], x)
x = self.LayerNorm(x)
return x
class BertModel_(torch.nn.Module):
def __init__(self, config_dict, dtype, device, operations):
super().__init__()
embed_dim = config_dict["hidden_size"]
layer_norm_eps = config_dict["layer_norm_eps"]
self.embeddings = BertEmbeddings(config_dict["vocab_size"], config_dict["max_position_embeddings"], config_dict["type_vocab_size"], config_dict["pad_token_id"], embed_dim, layer_norm_eps, dtype, device, operations)
self.encoder = BertEncoder(config_dict["num_hidden_layers"], embed_dim, config_dict["intermediate_size"], config_dict["num_attention_heads"], layer_norm_eps, dtype, device, operations)
def forward(self, input_tokens, attention_mask=None, intermediate_output=None, final_layer_norm_intermediate=True, dtype=None):
x = self.embeddings(input_tokens, dtype=dtype)
mask = None
if attention_mask is not None:
mask = 1.0 - attention_mask.to(x.dtype).reshape((attention_mask.shape[0], 1, -1, attention_mask.shape[-1])).expand(attention_mask.shape[0], 1, attention_mask.shape[-1], attention_mask.shape[-1])
mask = mask.masked_fill(mask.to(torch.bool), float("-inf"))
x, i = self.encoder(x, mask, intermediate_output)
return x, i
class BertModel(torch.nn.Module):
def __init__(self, config_dict, dtype, device, operations):
super().__init__()
self.bert = BertModel_(config_dict, dtype, device, operations)
self.num_layers = config_dict["num_hidden_layers"]
def get_input_embeddings(self):
return self.bert.embeddings.word_embeddings
def set_input_embeddings(self, embeddings):
self.bert.embeddings.word_embeddings = embeddings
def forward(self, *args, **kwargs):
return self.bert(*args, **kwargs)

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from comfy import sd1_clip
import comfy.text_encoders.t5
import comfy.model_management
from transformers import T5TokenizerFast
import torch
import os
class T5XXLModel(sd1_clip.SDClipModel):
def __init__(self, device="cpu", layer="last", layer_idx=None, dtype=None):
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_config_xxl.json")
super().__init__(device=device, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype, special_tokens={"end": 1, "pad": 0}, model_class=comfy.text_encoders.t5.T5)
class T5XXLTokenizer(sd1_clip.SDTokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
tokenizer_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_tokenizer")
super().__init__(tokenizer_path, pad_with_end=False, embedding_size=4096, embedding_key='t5xxl', tokenizer_class=T5TokenizerFast, has_start_token=False, pad_to_max_length=False, max_length=99999999, min_length=256)
class FluxTokenizer:
def __init__(self, embedding_directory=None, tokenizer_data={}):
self.clip_l = sd1_clip.SDTokenizer(embedding_directory=embedding_directory)
self.t5xxl = T5XXLTokenizer(embedding_directory=embedding_directory)
def tokenize_with_weights(self, text:str, return_word_ids=False):
out = {}
out["l"] = self.clip_l.tokenize_with_weights(text, return_word_ids)
out["t5xxl"] = self.t5xxl.tokenize_with_weights(text, return_word_ids)
return out
def untokenize(self, token_weight_pair):
return self.clip_l.untokenize(token_weight_pair)
def state_dict(self):
return {}
class FluxClipModel(torch.nn.Module):
def __init__(self, dtype_t5=None, device="cpu", dtype=None):
super().__init__()
dtype_t5 = comfy.model_management.pick_weight_dtype(dtype_t5, dtype, device)
self.clip_l = sd1_clip.SDClipModel(device=device, dtype=dtype, return_projected_pooled=False)
self.t5xxl = T5XXLModel(device=device, dtype=dtype_t5)
self.dtypes = set([dtype, dtype_t5])
def set_clip_options(self, options):
self.clip_l.set_clip_options(options)
self.t5xxl.set_clip_options(options)
def reset_clip_options(self):
self.clip_l.reset_clip_options()
self.t5xxl.reset_clip_options()
def encode_token_weights(self, token_weight_pairs):
token_weight_pairs_l = token_weight_pairs["l"]
token_weight_pars_t5 = token_weight_pairs["t5xxl"]
t5_out, t5_pooled = self.t5xxl.encode_token_weights(token_weight_pars_t5)
l_out, l_pooled = self.clip_l.encode_token_weights(token_weight_pairs_l)
return t5_out, l_pooled
def load_sd(self, sd):
if "text_model.encoder.layers.1.mlp.fc1.weight" in sd:
return self.clip_l.load_sd(sd)
else:
return self.t5xxl.load_sd(sd)
def flux_clip(dtype_t5=None):
class FluxClipModel_(FluxClipModel):
def __init__(self, device="cpu", dtype=None):
super().__init__(dtype_t5=dtype_t5, device=device, dtype=dtype)
return FluxClipModel_

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comfy/text_encoders/hydit.py Normal file
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from comfy import sd1_clip
from transformers import BertTokenizer
from .spiece_tokenizer import SPieceTokenizer
from .bert import BertModel
import comfy.text_encoders.t5
import os
import torch
class HyditBertModel(sd1_clip.SDClipModel):
def __init__(self, device="cpu", layer="last", layer_idx=None, dtype=None):
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "hydit_clip.json")
super().__init__(device=device, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype, special_tokens={"start": 101, "end": 102, "pad": 0}, model_class=BertModel, enable_attention_masks=True, return_attention_masks=True)
class HyditBertTokenizer(sd1_clip.SDTokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
tokenizer_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "hydit_clip_tokenizer")
super().__init__(tokenizer_path, pad_with_end=False, embedding_size=1024, embedding_key='chinese_roberta', tokenizer_class=BertTokenizer, pad_to_max_length=False, max_length=512, min_length=77)
class MT5XLModel(sd1_clip.SDClipModel):
def __init__(self, device="cpu", layer="last", layer_idx=None, dtype=None):
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "mt5_config_xl.json")
super().__init__(device=device, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype, special_tokens={"end": 1, "pad": 0}, model_class=comfy.text_encoders.t5.T5, enable_attention_masks=True, return_attention_masks=True)
class MT5XLTokenizer(sd1_clip.SDTokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
#tokenizer_path = os.path.join(os.path.join(os.path.dirname(os.path.realpath(__file__)), "mt5_tokenizer"), "spiece.model")
tokenizer = tokenizer_data.get("spiece_model", None)
super().__init__(tokenizer, pad_with_end=False, embedding_size=2048, embedding_key='mt5xl', tokenizer_class=SPieceTokenizer, has_start_token=False, pad_to_max_length=False, max_length=99999999, min_length=256)
def state_dict(self):
return {"spiece_model": self.tokenizer.serialize_model()}
class HyditTokenizer:
def __init__(self, embedding_directory=None, tokenizer_data={}):
mt5_tokenizer_data = tokenizer_data.get("mt5xl.spiece_model", None)
self.hydit_clip = HyditBertTokenizer(embedding_directory=embedding_directory)
self.mt5xl = MT5XLTokenizer(tokenizer_data={"spiece_model": mt5_tokenizer_data}, embedding_directory=embedding_directory)
def tokenize_with_weights(self, text:str, return_word_ids=False):
out = {}
out["hydit_clip"] = self.hydit_clip.tokenize_with_weights(text, return_word_ids)
out["mt5xl"] = self.mt5xl.tokenize_with_weights(text, return_word_ids)
return out
def untokenize(self, token_weight_pair):
return self.hydit_clip.untokenize(token_weight_pair)
def state_dict(self):
return {"mt5xl.spiece_model": self.mt5xl.state_dict()["spiece_model"]}
class HyditModel(torch.nn.Module):
def __init__(self, device="cpu", dtype=None):
super().__init__()
self.hydit_clip = HyditBertModel(dtype=dtype)
self.mt5xl = MT5XLModel(dtype=dtype)
self.dtypes = set()
if dtype is not None:
self.dtypes.add(dtype)
def encode_token_weights(self, token_weight_pairs):
hydit_out = self.hydit_clip.encode_token_weights(token_weight_pairs["hydit_clip"])
mt5_out = self.mt5xl.encode_token_weights(token_weight_pairs["mt5xl"])
return hydit_out[0], hydit_out[1], {"attention_mask": hydit_out[2]["attention_mask"], "conditioning_mt5xl": mt5_out[0], "attention_mask_mt5xl": mt5_out[2]["attention_mask"]}
def load_sd(self, sd):
if "bert.encoder.layer.0.attention.self.query.weight" in sd:
return self.hydit_clip.load_sd(sd)
else:
return self.mt5xl.load_sd(sd)
def set_clip_options(self, options):
self.hydit_clip.set_clip_options(options)
self.mt5xl.set_clip_options(options)
def reset_clip_options(self):
self.hydit_clip.reset_clip_options()
self.mt5xl.reset_clip_options()

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comfy/text_encoders/hydit_clip.json Normal file
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{
"_name_or_path": "hfl/chinese-roberta-wwm-ext-large",
"architectures": [
"BertModel"
],
"attention_probs_dropout_prob": 0.1,
"bos_token_id": 0,
"classifier_dropout": null,
"directionality": "bidi",
"eos_token_id": 2,
"hidden_act": "gelu",
"hidden_dropout_prob": 0.1,
"hidden_size": 1024,
"initializer_range": 0.02,
"intermediate_size": 4096,
"layer_norm_eps": 1e-12,
"max_position_embeddings": 512,
"model_type": "bert",
"num_attention_heads": 16,
"num_hidden_layers": 24,
"output_past": true,
"pad_token_id": 0,
"pooler_fc_size": 768,
"pooler_num_attention_heads": 12,
"pooler_num_fc_layers": 3,
"pooler_size_per_head": 128,
"pooler_type": "first_token_transform",
"position_embedding_type": "absolute",
"torch_dtype": "float32",
"transformers_version": "4.22.1",
"type_vocab_size": 2,
"use_cache": true,
"vocab_size": 47020
}

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comfy/text_encoders/hydit_clip_tokenizer/special_tokens_map.json Normal file
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{
"cls_token": "[CLS]",
"mask_token": "[MASK]",
"pad_token": "[PAD]",
"sep_token": "[SEP]",
"unk_token": "[UNK]"
}

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comfy/text_encoders/hydit_clip_tokenizer/tokenizer_config.json Normal file
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{
"cls_token": "[CLS]",
"do_basic_tokenize": true,
"do_lower_case": true,
"mask_token": "[MASK]",
"name_or_path": "hfl/chinese-roberta-wwm-ext",
"never_split": null,
"pad_token": "[PAD]",
"sep_token": "[SEP]",
"special_tokens_map_file": "/home/chenweifeng/.cache/huggingface/hub/models--hfl--chinese-roberta-wwm-ext/snapshots/5c58d0b8ec1d9014354d691c538661bf00bfdb44/special_tokens_map.json",
"strip_accents": null,
"tokenize_chinese_chars": true,
"tokenizer_class": "BertTokenizer",
"unk_token": "[UNK]",
"model_max_length": 77
}

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comfy/text_encoders/hydit_clip_tokenizer/vocab.txt Normal file
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comfy/text_encoders/mt5_config_xl.json Normal file
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{
"d_ff": 5120,
"d_kv": 64,
"d_model": 2048,
"decoder_start_token_id": 0,
"dropout_rate": 0.1,
"eos_token_id": 1,
"dense_act_fn": "gelu_pytorch_tanh",
"initializer_factor": 1.0,
"is_encoder_decoder": true,
"is_gated_act": true,
"layer_norm_epsilon": 1e-06,
"model_type": "mt5",
"num_decoder_layers": 24,
"num_heads": 32,
"num_layers": 24,
"output_past": true,
"pad_token_id": 0,
"relative_attention_num_buckets": 32,
"tie_word_embeddings": false,
"vocab_size": 250112
}

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comfy/text_encoders/sa_t5.py Normal file
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from comfy import sd1_clip
from transformers import T5TokenizerFast
import comfy.text_encoders.t5
import os
class T5BaseModel(sd1_clip.SDClipModel):
def __init__(self, device="cpu", layer="last", layer_idx=None, dtype=None):
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_config_base.json")
super().__init__(device=device, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype, special_tokens={"end": 1, "pad": 0}, model_class=comfy.text_encoders.t5.T5, enable_attention_masks=True, zero_out_masked=True)
class T5BaseTokenizer(sd1_clip.SDTokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
tokenizer_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_tokenizer")
super().__init__(tokenizer_path, pad_with_end=False, embedding_size=768, embedding_key='t5base', tokenizer_class=T5TokenizerFast, has_start_token=False, pad_to_max_length=False, max_length=99999999, min_length=128)
class SAT5Tokenizer(sd1_clip.SD1Tokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
super().__init__(embedding_directory=embedding_directory, tokenizer_data=tokenizer_data, clip_name="t5base", tokenizer=T5BaseTokenizer)
class SAT5Model(sd1_clip.SD1ClipModel):
def __init__(self, device="cpu", dtype=None, **kwargs):
super().__init__(device=device, dtype=dtype, name="t5base", clip_model=T5BaseModel, **kwargs)

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comfy/text_encoders/sd2_clip.py Normal file
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from comfy import sd1_clip
import os
class SD2ClipHModel(sd1_clip.SDClipModel):
def __init__(self, arch="ViT-H-14", device="cpu", max_length=77, freeze=True, layer="penultimate", layer_idx=None, dtype=None):
if layer == "penultimate":
layer="hidden"
layer_idx=-2
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "sd2_clip_config.json")
super().__init__(device=device, freeze=freeze, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype, special_tokens={"start": 49406, "end": 49407, "pad": 0})
class SD2ClipHTokenizer(sd1_clip.SDTokenizer):
def __init__(self, tokenizer_path=None, embedding_directory=None, tokenizer_data={}):
super().__init__(tokenizer_path, pad_with_end=False, embedding_directory=embedding_directory, embedding_size=1024)
class SD2Tokenizer(sd1_clip.SD1Tokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
super().__init__(embedding_directory=embedding_directory, tokenizer_data=tokenizer_data, clip_name="h", tokenizer=SD2ClipHTokenizer)
class SD2ClipModel(sd1_clip.SD1ClipModel):
def __init__(self, device="cpu", dtype=None, **kwargs):
super().__init__(device=device, dtype=dtype, clip_name="h", clip_model=SD2ClipHModel, **kwargs)

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comfy/text_encoders/sd2_clip_config.json Normal file
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{
"architectures": [
"CLIPTextModel"
],
"attention_dropout": 0.0,
"bos_token_id": 0,
"dropout": 0.0,
"eos_token_id": 49407,
"hidden_act": "gelu",
"hidden_size": 1024,
"initializer_factor": 1.0,
"initializer_range": 0.02,
"intermediate_size": 4096,
"layer_norm_eps": 1e-05,
"max_position_embeddings": 77,
"model_type": "clip_text_model",
"num_attention_heads": 16,
"num_hidden_layers": 24,
"pad_token_id": 1,
"projection_dim": 1024,
"torch_dtype": "float32",
"vocab_size": 49408
}

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comfy/text_encoders/sd3_clip.py Normal file
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from comfy import sd1_clip
from comfy import sdxl_clip
from transformers import T5TokenizerFast
import comfy.text_encoders.t5
import torch
import os
import comfy.model_management
import logging
class T5XXLModel(sd1_clip.SDClipModel):
def __init__(self, device="cpu", layer="last", layer_idx=None, dtype=None):
textmodel_json_config = os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_config_xxl.json")
super().__init__(device=device, layer=layer, layer_idx=layer_idx, textmodel_json_config=textmodel_json_config, dtype=dtype, special_tokens={"end": 1, "pad": 0}, model_class=comfy.text_encoders.t5.T5)
class T5XXLTokenizer(sd1_clip.SDTokenizer):
def __init__(self, embedding_directory=None, tokenizer_data={}):
tokenizer_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "t5_tokenizer")
super().__init__(tokenizer_path, pad_with_end=False, embedding_size=4096, embedding_key='t5xxl', tokenizer_class=T5TokenizerFast, has_start_token=False, pad_to_max_length=False, max_length=99999999, min_length=77)
class SD3Tokenizer:
def __init__(self, embedding_directory=None, tokenizer_data={}):
self.clip_l = sd1_clip.SDTokenizer(embedding_directory=embedding_directory)
self.clip_g = sdxl_clip.SDXLClipGTokenizer(embedding_directory=embedding_directory)
self.t5xxl = T5XXLTokenizer(embedding_directory=embedding_directory)
def tokenize_with_weights(self, text:str, return_word_ids=False):
out = {}
out["g"] = self.clip_g.tokenize_with_weights(text, return_word_ids)
out["l"] = self.clip_l.tokenize_with_weights(text, return_word_ids)
out["t5xxl"] = self.t5xxl.tokenize_with_weights(text, return_word_ids)
return out
def untokenize(self, token_weight_pair):
return self.clip_g.untokenize(token_weight_pair)
def state_dict(self):
return {}
class SD3ClipModel(torch.nn.Module):
def __init__(self, clip_l=True, clip_g=True, t5=True, dtype_t5=None, device="cpu", dtype=None):
super().__init__()
self.dtypes = set()
if clip_l:
self.clip_l = sd1_clip.SDClipModel(layer="hidden", layer_idx=-2, device=device, dtype=dtype, layer_norm_hidden_state=False, return_projected_pooled=False)
self.dtypes.add(dtype)
else:
self.clip_l = None
if clip_g:
self.clip_g = sdxl_clip.SDXLClipG(device=device, dtype=dtype)
self.dtypes.add(dtype)
else:
self.clip_g = None
if t5:
dtype_t5 = comfy.model_management.pick_weight_dtype(dtype_t5, dtype, device)
self.t5xxl = T5XXLModel(device=device, dtype=dtype_t5)
self.dtypes.add(dtype_t5)
else:
self.t5xxl = None
logging.debug("Created SD3 text encoder with: clip_l {}, clip_g {}, t5xxl {}:{}".format(clip_l, clip_g, t5, dtype_t5))
def set_clip_options(self, options):
if self.clip_l is not None:
self.clip_l.set_clip_options(options)
if self.clip_g is not None:
self.clip_g.set_clip_options(options)
if self.t5xxl is not None:
self.t5xxl.set_clip_options(options)
def reset_clip_options(self):
if self.clip_l is not None:
self.clip_l.reset_clip_options()
if self.clip_g is not None:
self.clip_g.reset_clip_options()
if self.t5xxl is not None:
self.t5xxl.reset_clip_options()
def encode_token_weights(self, token_weight_pairs):
token_weight_pairs_l = token_weight_pairs["l"]
token_weight_pairs_g = token_weight_pairs["g"]
token_weight_pars_t5 = token_weight_pairs["t5xxl"]
lg_out = None
pooled = None
out = None
if len(token_weight_pairs_g) > 0 or len(token_weight_pairs_l) > 0:
if self.clip_l is not None:
lg_out, l_pooled = self.clip_l.encode_token_weights(token_weight_pairs_l)
else:
l_pooled = torch.zeros((1, 768), device=comfy.model_management.intermediate_device())
if self.clip_g is not None:
g_out, g_pooled = self.clip_g.encode_token_weights(token_weight_pairs_g)
if lg_out is not None:
lg_out = torch.cat([lg_out, g_out], dim=-1)
else:
lg_out = torch.nn.functional.pad(g_out, (768, 0))
else:
g_out = None
g_pooled = torch.zeros((1, 1280), device=comfy.model_management.intermediate_device())
if lg_out is not None:
lg_out = torch.nn.functional.pad(lg_out, (0, 4096 - lg_out.shape[-1]))
out = lg_out
pooled = torch.cat((l_pooled, g_pooled), dim=-1)
if self.t5xxl is not None:
t5_out, t5_pooled = self.t5xxl.encode_token_weights(token_weight_pars_t5)
if lg_out is not None:
out = torch.cat([lg_out, t5_out], dim=-2)
else:
out = t5_out
if out is None:
out = torch.zeros((1, 77, 4096), device=comfy.model_management.intermediate_device())
if pooled is None:
pooled = torch.zeros((1, 768 + 1280), device=comfy.model_management.intermediate_device())
return out, pooled
def load_sd(self, sd):
if "text_model.encoder.layers.30.mlp.fc1.weight" in sd:
return self.clip_g.load_sd(sd)
elif "text_model.encoder.layers.1.mlp.fc1.weight" in sd:
return self.clip_l.load_sd(sd)
else:
return self.t5xxl.load_sd(sd)
def sd3_clip(clip_l=True, clip_g=True, t5=True, dtype_t5=None):
class SD3ClipModel_(SD3ClipModel):
def __init__(self, device="cpu", dtype=None):
super().__init__(clip_l=clip_l, clip_g=clip_g, t5=t5, dtype_t5=dtype_t5, device=device, dtype=dtype)
return SD3ClipModel_

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comfy/text_encoders/spiece_tokenizer.py Normal file
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import os
import torch
class SPieceTokenizer:
add_eos = True
@staticmethod
def from_pretrained(path):
return SPieceTokenizer(path)
def __init__(self, tokenizer_path):
import sentencepiece
if torch.is_tensor(tokenizer_path):
tokenizer_path = tokenizer_path.numpy().tobytes()
if isinstance(tokenizer_path, bytes):
self.tokenizer = sentencepiece.SentencePieceProcessor(model_proto=tokenizer_path, add_eos=self.add_eos)
else:
self.tokenizer = sentencepiece.SentencePieceProcessor(model_file=tokenizer_path, add_eos=self.add_eos)
def get_vocab(self):
out = {}
for i in range(self.tokenizer.get_piece_size()):
out[self.tokenizer.id_to_piece(i)] = i
return out
def __call__(self, string):
out = self.tokenizer.encode(string)
return {"input_ids": out}
def serialize_model(self):
return torch.ByteTensor(list(self.tokenizer.serialized_model_proto()))

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import torch
import math
from comfy.ldm.modules.attention import optimized_attention_for_device
import comfy.ops
class T5LayerNorm(torch.nn.Module):
def __init__(self, hidden_size, eps=1e-6, dtype=None, device=None, operations=None):
super().__init__()
self.weight = torch.nn.Parameter(torch.empty(hidden_size, dtype=dtype, device=device))
self.variance_epsilon = eps
def forward(self, x):
variance = x.pow(2).mean(-1, keepdim=True)
x = x * torch.rsqrt(variance + self.variance_epsilon)
return comfy.ops.cast_to_input(self.weight, x) * x
activations = {
"gelu_pytorch_tanh": lambda a: torch.nn.functional.gelu(a, approximate="tanh"),
"relu": torch.nn.functional.relu,
}
class T5DenseActDense(torch.nn.Module):
def __init__(self, model_dim, ff_dim, ff_activation, dtype, device, operations):
super().__init__()
self.wi = operations.Linear(model_dim, ff_dim, bias=False, dtype=dtype, device=device)
self.wo = operations.Linear(ff_dim, model_dim, bias=False, dtype=dtype, device=device)
# self.dropout = nn.Dropout(config.dropout_rate)
self.act = activations[ff_activation]
def forward(self, x):
x = self.act(self.wi(x))
# x = self.dropout(x)
x = self.wo(x)
return x
class T5DenseGatedActDense(torch.nn.Module):
def __init__(self, model_dim, ff_dim, ff_activation, dtype, device, operations):
super().__init__()
self.wi_0 = operations.Linear(model_dim, ff_dim, bias=False, dtype=dtype, device=device)
self.wi_1 = operations.Linear(model_dim, ff_dim, bias=False, dtype=dtype, device=device)
self.wo = operations.Linear(ff_dim, model_dim, bias=False, dtype=dtype, device=device)
# self.dropout = nn.Dropout(config.dropout_rate)
self.act = activations[ff_activation]
def forward(self, x):
hidden_gelu = self.act(self.wi_0(x))
hidden_linear = self.wi_1(x)
x = hidden_gelu * hidden_linear
# x = self.dropout(x)
x = self.wo(x)
return x
class T5LayerFF(torch.nn.Module):
def __init__(self, model_dim, ff_dim, ff_activation, gated_act, dtype, device, operations):
super().__init__()
if gated_act:
self.DenseReluDense = T5DenseGatedActDense(model_dim, ff_dim, ff_activation, dtype, device, operations)
else:
self.DenseReluDense = T5DenseActDense(model_dim, ff_dim, ff_activation, dtype, device, operations)
self.layer_norm = T5LayerNorm(model_dim, dtype=dtype, device=device, operations=operations)
# self.dropout = nn.Dropout(config.dropout_rate)
def forward(self, x):
forwarded_states = self.layer_norm(x)
forwarded_states = self.DenseReluDense(forwarded_states)
# x = x + self.dropout(forwarded_states)
x += forwarded_states
return x
class T5Attention(torch.nn.Module):
def __init__(self, model_dim, inner_dim, num_heads, relative_attention_bias, dtype, device, operations):
super().__init__()
# Mesh TensorFlow initialization to avoid scaling before softmax
self.q = operations.Linear(model_dim, inner_dim, bias=False, dtype=dtype, device=device)
self.k = operations.Linear(model_dim, inner_dim, bias=False, dtype=dtype, device=device)
self.v = operations.Linear(model_dim, inner_dim, bias=False, dtype=dtype, device=device)
self.o = operations.Linear(inner_dim, model_dim, bias=False, dtype=dtype, device=device)
self.num_heads = num_heads
self.relative_attention_bias = None
if relative_attention_bias:
self.relative_attention_num_buckets = 32
self.relative_attention_max_distance = 128
self.relative_attention_bias = operations.Embedding(self.relative_attention_num_buckets, self.num_heads, device=device, dtype=dtype)
@staticmethod
def _relative_position_bucket(relative_position, bidirectional=True, num_buckets=32, max_distance=128):
"""
Adapted from Mesh Tensorflow:
https://github.com/tensorflow/mesh/blob/0cb87fe07da627bf0b7e60475d59f95ed6b5be3d/mesh_tensorflow/transformer/transformer_layers.py#L593
Translate relative position to a bucket number for relative attention. The relative position is defined as
memory_position - query_position, i.e. the distance in tokens from the attending position to the attended-to
position. If bidirectional=False, then positive relative positions are invalid. We use smaller buckets for
small absolute relative_position and larger buckets for larger absolute relative_positions. All relative
positions >=max_distance map to the same bucket. All relative positions <=-max_distance map to the same bucket.
This should allow for more graceful generalization to longer sequences than the model has been trained on
Args:
relative_position: an int32 Tensor
bidirectional: a boolean - whether the attention is bidirectional
num_buckets: an integer
max_distance: an integer
Returns:
a Tensor with the same shape as relative_position, containing int32 values in the range [0, num_buckets)
"""
relative_buckets = 0
if bidirectional:
num_buckets //= 2
relative_buckets += (relative_position > 0).to(torch.long) * num_buckets
relative_position = torch.abs(relative_position)
else:
relative_position = -torch.min(relative_position, torch.zeros_like(relative_position))
# now relative_position is in the range [0, inf)
# half of the buckets are for exact increments in positions
max_exact = num_buckets // 2
is_small = relative_position < max_exact
# The other half of the buckets are for logarithmically bigger bins in positions up to max_distance
relative_position_if_large = max_exact + (
torch.log(relative_position.float() / max_exact)
/ math.log(max_distance / max_exact)
* (num_buckets - max_exact)
).to(torch.long)
relative_position_if_large = torch.min(
relative_position_if_large, torch.full_like(relative_position_if_large, num_buckets - 1)
)
relative_buckets += torch.where(is_small, relative_position, relative_position_if_large)
return relative_buckets
def compute_bias(self, query_length, key_length, device, dtype):
"""Compute binned relative position bias"""
context_position = torch.arange(query_length, dtype=torch.long, device=device)[:, None]
memory_position = torch.arange(key_length, dtype=torch.long, device=device)[None, :]
relative_position = memory_position - context_position # shape (query_length, key_length)
relative_position_bucket = self._relative_position_bucket(
relative_position, # shape (query_length, key_length)
bidirectional=True,
num_buckets=self.relative_attention_num_buckets,
max_distance=self.relative_attention_max_distance,
)
values = self.relative_attention_bias(relative_position_bucket, out_dtype=dtype) # shape (query_length, key_length, num_heads)
values = values.permute([2, 0, 1]).unsqueeze(0) # shape (1, num_heads, query_length, key_length)
return values
def forward(self, x, mask=None, past_bias=None, optimized_attention=None):
q = self.q(x)
k = self.k(x)
v = self.v(x)
if self.relative_attention_bias is not None:
past_bias = self.compute_bias(x.shape[1], x.shape[1], x.device, x.dtype)
if past_bias is not None:
if mask is not None:
mask = mask + past_bias
else:
mask = past_bias
out = optimized_attention(q, k * ((k.shape[-1] / self.num_heads) ** 0.5), v, self.num_heads, mask)
return self.o(out), past_bias
class T5LayerSelfAttention(torch.nn.Module):
def __init__(self, model_dim, inner_dim, ff_dim, num_heads, relative_attention_bias, dtype, device, operations):
super().__init__()
self.SelfAttention = T5Attention(model_dim, inner_dim, num_heads, relative_attention_bias, dtype, device, operations)
self.layer_norm = T5LayerNorm(model_dim, dtype=dtype, device=device, operations=operations)
# self.dropout = nn.Dropout(config.dropout_rate)
def forward(self, x, mask=None, past_bias=None, optimized_attention=None):
normed_hidden_states = self.layer_norm(x)
output, past_bias = self.SelfAttention(self.layer_norm(x), mask=mask, past_bias=past_bias, optimized_attention=optimized_attention)
# x = x + self.dropout(attention_output)
x += output
return x, past_bias
class T5Block(torch.nn.Module):
def __init__(self, model_dim, inner_dim, ff_dim, ff_activation, gated_act, num_heads, relative_attention_bias, dtype, device, operations):
super().__init__()
self.layer = torch.nn.ModuleList()
self.layer.append(T5LayerSelfAttention(model_dim, inner_dim, ff_dim, num_heads, relative_attention_bias, dtype, device, operations))
self.layer.append(T5LayerFF(model_dim, ff_dim, ff_activation, gated_act, dtype, device, operations))
def forward(self, x, mask=None, past_bias=None, optimized_attention=None):
x, past_bias = self.layer[0](x, mask, past_bias, optimized_attention)
x = self.layer[-1](x)
return x, past_bias
class T5Stack(torch.nn.Module):
def __init__(self, num_layers, model_dim, inner_dim, ff_dim, ff_activation, gated_act, num_heads, relative_attention, dtype, device, operations):
super().__init__()
self.block = torch.nn.ModuleList(
[T5Block(model_dim, inner_dim, ff_dim, ff_activation, gated_act, num_heads, relative_attention_bias=((not relative_attention) or (i == 0)), dtype=dtype, device=device, operations=operations) for i in range(num_layers)]
)
self.final_layer_norm = T5LayerNorm(model_dim, dtype=dtype, device=device, operations=operations)
# self.dropout = nn.Dropout(config.dropout_rate)
def forward(self, x, attention_mask=None, intermediate_output=None, final_layer_norm_intermediate=True, dtype=None):
mask = None
if attention_mask is not None:
mask = 1.0 - attention_mask.to(x.dtype).reshape((attention_mask.shape[0], 1, -1, attention_mask.shape[-1])).expand(attention_mask.shape[0], 1, attention_mask.shape[-1], attention_mask.shape[-1])
mask = mask.masked_fill(mask.to(torch.bool), float("-inf"))
intermediate = None
optimized_attention = optimized_attention_for_device(x.device, mask=attention_mask is not None, small_input=True)
past_bias = None
for i, l in enumerate(self.block):
x, past_bias = l(x, mask, past_bias, optimized_attention)
if i == intermediate_output:
intermediate = x.clone()
x = self.final_layer_norm(x)
if intermediate is not None and final_layer_norm_intermediate:
intermediate = self.final_layer_norm(intermediate)
return x, intermediate
class T5(torch.nn.Module):
def __init__(self, config_dict, dtype, device, operations):
super().__init__()
self.num_layers = config_dict["num_layers"]
model_dim = config_dict["d_model"]
self.encoder = T5Stack(self.num_layers, model_dim, model_dim, config_dict["d_ff"], config_dict["dense_act_fn"], config_dict["is_gated_act"], config_dict["num_heads"], config_dict["model_type"] != "umt5", dtype, device, operations)
self.dtype = dtype
self.shared = operations.Embedding(config_dict["vocab_size"], model_dim, device=device, dtype=dtype)
def get_input_embeddings(self):
return self.shared
def set_input_embeddings(self, embeddings):
self.shared = embeddings
def forward(self, input_ids, *args, **kwargs):
x = self.shared(input_ids, out_dtype=kwargs.get("dtype", torch.float32))
if self.dtype not in [torch.float32, torch.float16, torch.bfloat16]:
x = torch.nan_to_num(x) #Fix for fp8 T5 base
return self.encoder(x, *args, **kwargs)

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{
"d_ff": 3072,
"d_kv": 64,
"d_model": 768,
"decoder_start_token_id": 0,
"dropout_rate": 0.1,
"eos_token_id": 1,
"dense_act_fn": "relu",
"initializer_factor": 1.0,
"is_encoder_decoder": true,
"is_gated_act": false,
"layer_norm_epsilon": 1e-06,
"model_type": "t5",
"num_decoder_layers": 12,
"num_heads": 12,
"num_layers": 12,
"output_past": true,
"pad_token_id": 0,
"relative_attention_num_buckets": 32,
"tie_word_embeddings": false,
"vocab_size": 32128
}

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comfy/text_encoders/t5_config_xxl.json Normal file
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{
"d_ff": 10240,
"d_kv": 64,
"d_model": 4096,
"decoder_start_token_id": 0,
"dropout_rate": 0.1,
"eos_token_id": 1,
"dense_act_fn": "gelu_pytorch_tanh",
"initializer_factor": 1.0,
"is_encoder_decoder": true,
"is_gated_act": true,
"layer_norm_epsilon": 1e-06,
"model_type": "t5",
"num_decoder_layers": 24,
"num_heads": 64,
"num_layers": 24,
"output_past": true,
"pad_token_id": 0,
"relative_attention_num_buckets": 32,
"tie_word_embeddings": false,
"vocab_size": 32128
}

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comfy/text_encoders/t5_pile_config_xl.json Normal file
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{
"d_ff": 5120,
"d_kv": 64,
"d_model": 2048,
"decoder_start_token_id": 0,
"dropout_rate": 0.1,
"eos_token_id": 2,
"dense_act_fn": "gelu_pytorch_tanh",
"initializer_factor": 1.0,
"is_encoder_decoder": true,
"is_gated_act": true,
"layer_norm_epsilon": 1e-06,
"model_type": "umt5",
"num_decoder_layers": 24,
"num_heads": 32,
"num_layers": 24,
"output_past": true,
"pad_token_id": 1,
"relative_attention_num_buckets": 32,
"tie_word_embeddings": false,
"vocab_size": 32128
}

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comfy/text_encoders/t5_tokenizer/special_tokens_map.json Normal file
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{
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}

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