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2112 lines (1842 loc) 路 94.1 KB
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# Copyright 2026 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from dataclasses import dataclass
from typing import Any
import torch
import torch.nn as nn
import torch.nn.functional as F
from ...configuration_utils import ConfigMixin, FrozenDict, register_to_config
from ...loaders import FromOriginalModelMixin, PeftAdapterMixin, UNet2DConditionLoadersMixin
from ...utils import BaseOutput, apply_lora_scale, deprecate, logging
from ...utils.torch_utils import apply_freeu, maybe_adjust_dtype_for_device
from ..attention import AttentionMixin, BasicTransformerBlock
from ..attention_processor import (
ADDED_KV_ATTENTION_PROCESSORS,
CROSS_ATTENTION_PROCESSORS,
Attention,
AttnAddedKVProcessor,
AttnProcessor,
AttnProcessor2_0,
FusedAttnProcessor2_0,
IPAdapterAttnProcessor,
IPAdapterAttnProcessor2_0,
)
from ..embeddings import TimestepEmbedding, Timesteps
from ..modeling_utils import ModelMixin
from ..resnet import Downsample2D, ResnetBlock2D, Upsample2D
from ..transformers.dual_transformer_2d import DualTransformer2DModel
from ..transformers.transformer_2d import Transformer2DModel
from .unet_2d_blocks import UNetMidBlock2DCrossAttn
from .unet_2d_condition import UNet2DConditionModel
logger = logging.get_logger(__name__) # pylint: disable=invalid-name
@dataclass
class UNetMotionOutput(BaseOutput):
"""
The output of [`UNetMotionOutput`].
Args:
sample (`torch.Tensor` of shape `(batch_size, num_channels, num_frames, height, width)`):
The hidden states output conditioned on `encoder_hidden_states` input. Output of last layer of model.
"""
sample: torch.Tensor
class AnimateDiffTransformer3D(nn.Module):
"""
A Transformer model for video-like data.
Parameters:
num_attention_heads (`int`, *optional*, defaults to 16): The number of heads to use for multi-head attention.
attention_head_dim (`int`, *optional*, defaults to 88): The number of channels in each head.
in_channels (`int`, *optional*):
The number of channels in the input and output (specify if the input is **continuous**).
num_layers (`int`, *optional*, defaults to 1): The number of layers of Transformer blocks to use.
dropout (`float`, *optional*, defaults to 0.0): The dropout probability to use.
cross_attention_dim (`int`, *optional*): The number of `encoder_hidden_states` dimensions to use.
attention_bias (`bool`, *optional*):
Configure if the `TransformerBlock` attention should contain a bias parameter.
sample_size (`int`, *optional*): The width of the latent images (specify if the input is **discrete**).
This is fixed during training since it is used to learn a number of position embeddings.
activation_fn (`str`, *optional*, defaults to `"geglu"`):
Activation function to use in feed-forward. See `diffusers.models.activations.get_activation` for supported
activation functions.
norm_elementwise_affine (`bool`, *optional*):
Configure if the `TransformerBlock` should use learnable elementwise affine parameters for normalization.
double_self_attention (`bool`, *optional*):
Configure if each `TransformerBlock` should contain two self-attention layers.
positional_embeddings: (`str`, *optional*):
The type of positional embeddings to apply to the sequence input before passing use.
num_positional_embeddings: (`int`, *optional*):
The maximum length of the sequence over which to apply positional embeddings.
"""
def __init__(
self,
num_attention_heads: int = 16,
attention_head_dim: int = 88,
in_channels: int | None = None,
out_channels: int | None = None,
num_layers: int = 1,
dropout: float = 0.0,
norm_num_groups: int = 32,
cross_attention_dim: int | None = None,
attention_bias: bool = False,
sample_size: int | None = None,
activation_fn: str = "geglu",
norm_elementwise_affine: bool = True,
double_self_attention: bool = True,
positional_embeddings: str | None = None,
num_positional_embeddings: int | None = None,
):
super().__init__()
self.num_attention_heads = num_attention_heads
self.attention_head_dim = attention_head_dim
inner_dim = num_attention_heads * attention_head_dim
self.in_channels = in_channels
self.norm = nn.GroupNorm(num_groups=norm_num_groups, num_channels=in_channels, eps=1e-6, affine=True)
self.proj_in = nn.Linear(in_channels, inner_dim)
# 3. Define transformers blocks
self.transformer_blocks = nn.ModuleList(
[
BasicTransformerBlock(
inner_dim,
num_attention_heads,
attention_head_dim,
dropout=dropout,
cross_attention_dim=cross_attention_dim,
activation_fn=activation_fn,
attention_bias=attention_bias,
double_self_attention=double_self_attention,
norm_elementwise_affine=norm_elementwise_affine,
positional_embeddings=positional_embeddings,
num_positional_embeddings=num_positional_embeddings,
)
for _ in range(num_layers)
]
)
self.proj_out = nn.Linear(inner_dim, in_channels)
def forward(
self,
hidden_states: torch.Tensor,
encoder_hidden_states: torch.LongTensor | None = None,
timestep: torch.LongTensor | None = None,
class_labels: torch.LongTensor | None = None,
num_frames: int = 1,
cross_attention_kwargs: dict[str, Any] | None = None,
) -> torch.Tensor:
"""
The [`AnimateDiffTransformer3D`] forward method.
Args:
hidden_states (`torch.LongTensor` of shape `(batch size, num latent pixels)` if discrete, `torch.Tensor` of shape `(batch size, channel, height, width)` if continuous):
Input hidden_states.
encoder_hidden_states ( `torch.LongTensor` of shape `(batch size, encoder_hidden_states dim)`, *optional*):
Conditional embeddings for cross attention layer. If not given, cross-attention defaults to
self-attention.
timestep ( `torch.LongTensor`, *optional*):
Used to indicate denoising step. Optional timestep to be applied as an embedding in `AdaLayerNorm`.
class_labels ( `torch.LongTensor` of shape `(batch size, num classes)`, *optional*):
Used to indicate class labels conditioning. Optional class labels to be applied as an embedding in
`AdaLayerZeroNorm`.
num_frames (`int`, *optional*, defaults to 1):
The number of frames to be processed per batch. This is used to reshape the hidden states.
cross_attention_kwargs (`dict`, *optional*):
A kwargs dictionary that if specified is passed along to the `AttentionProcessor` as defined under
`self.processor` in
[diffusers.models.attention_processor](https://github.com/huggingface/diffusers/blob/main/src/diffusers/models/attention_processor.py).
Returns:
torch.Tensor:
The output tensor.
"""
# 1. Input
batch_frames, channel, height, width = hidden_states.shape
batch_size = batch_frames // num_frames
residual = hidden_states
hidden_states = hidden_states[None, :].reshape(batch_size, num_frames, channel, height, width)
hidden_states = hidden_states.permute(0, 2, 1, 3, 4)
hidden_states = self.norm(hidden_states)
hidden_states = hidden_states.permute(0, 3, 4, 2, 1).reshape(batch_size * height * width, num_frames, channel)
hidden_states = self.proj_in(input=hidden_states)
# 2. Blocks
for block in self.transformer_blocks:
hidden_states = block(
hidden_states=hidden_states,
encoder_hidden_states=encoder_hidden_states,
timestep=timestep,
cross_attention_kwargs=cross_attention_kwargs,
class_labels=class_labels,
)
# 3. Output
hidden_states = self.proj_out(input=hidden_states)
hidden_states = (
hidden_states[None, None, :]
.reshape(batch_size, height, width, num_frames, channel)
.permute(0, 3, 4, 1, 2)
.contiguous()
)
hidden_states = hidden_states.reshape(batch_frames, channel, height, width)
output = hidden_states + residual
return output
class DownBlockMotion(nn.Module):
def __init__(
self,
in_channels: int,
out_channels: int,
temb_channels: int,
dropout: float = 0.0,
num_layers: int = 1,
resnet_eps: float = 1e-6,
resnet_time_scale_shift: str = "default",
resnet_act_fn: str = "swish",
resnet_groups: int = 32,
resnet_pre_norm: bool = True,
output_scale_factor: float = 1.0,
add_downsample: bool = True,
downsample_padding: int = 1,
temporal_num_attention_heads: int | tuple[int] = 1,
temporal_cross_attention_dim: int | None = None,
temporal_max_seq_length: int = 32,
temporal_transformer_layers_per_block: int | tuple[int] = 1,
temporal_double_self_attention: bool = True,
):
super().__init__()
resnets = []
motion_modules = []
# support for variable transformer layers per temporal block
if isinstance(temporal_transformer_layers_per_block, int):
temporal_transformer_layers_per_block = (temporal_transformer_layers_per_block,) * num_layers
elif len(temporal_transformer_layers_per_block) != num_layers:
raise ValueError(
f"`temporal_transformer_layers_per_block` must be an integer or a tuple of integers of length {num_layers}"
)
# support for variable number of attention head per temporal layers
if isinstance(temporal_num_attention_heads, int):
temporal_num_attention_heads = (temporal_num_attention_heads,) * num_layers
elif len(temporal_num_attention_heads) != num_layers:
raise ValueError(
f"`temporal_num_attention_heads` must be an integer or a tuple of integers of length {num_layers}"
)
for i in range(num_layers):
in_channels = in_channels if i == 0 else out_channels
resnets.append(
ResnetBlock2D(
in_channels=in_channels,
out_channels=out_channels,
temb_channels=temb_channels,
eps=resnet_eps,
groups=resnet_groups,
dropout=dropout,
time_embedding_norm=resnet_time_scale_shift,
non_linearity=resnet_act_fn,
output_scale_factor=output_scale_factor,
pre_norm=resnet_pre_norm,
)
)
motion_modules.append(
AnimateDiffTransformer3D(
num_attention_heads=temporal_num_attention_heads[i],
in_channels=out_channels,
num_layers=temporal_transformer_layers_per_block[i],
norm_num_groups=resnet_groups,
cross_attention_dim=temporal_cross_attention_dim,
attention_bias=False,
activation_fn="geglu",
positional_embeddings="sinusoidal",
num_positional_embeddings=temporal_max_seq_length,
attention_head_dim=out_channels // temporal_num_attention_heads[i],
double_self_attention=temporal_double_self_attention,
)
)
self.resnets = nn.ModuleList(resnets)
self.motion_modules = nn.ModuleList(motion_modules)
if add_downsample:
self.downsamplers = nn.ModuleList(
[
Downsample2D(
out_channels,
use_conv=True,
out_channels=out_channels,
padding=downsample_padding,
name="op",
)
]
)
else:
self.downsamplers = None
self.gradient_checkpointing = False
def forward(
self,
hidden_states: torch.Tensor,
temb: torch.Tensor | None = None,
num_frames: int = 1,
*args,
**kwargs,
) -> torch.Tensor | tuple[torch.Tensor, ...]:
if len(args) > 0 or kwargs.get("scale", None) is not None:
deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`."
deprecate("scale", "1.0.0", deprecation_message)
output_states = ()
blocks = zip(self.resnets, self.motion_modules)
for resnet, motion_module in blocks:
if torch.is_grad_enabled() and self.gradient_checkpointing:
hidden_states = self._gradient_checkpointing_func(resnet, hidden_states, temb)
else:
hidden_states = resnet(input_tensor=hidden_states, temb=temb)
hidden_states = motion_module(hidden_states, num_frames=num_frames)
output_states = output_states + (hidden_states,)
if self.downsamplers is not None:
for downsampler in self.downsamplers:
hidden_states = downsampler(hidden_states=hidden_states)
output_states = output_states + (hidden_states,)
return hidden_states, output_states
class CrossAttnDownBlockMotion(nn.Module):
def __init__(
self,
in_channels: int,
out_channels: int,
temb_channels: int,
dropout: float = 0.0,
num_layers: int = 1,
transformer_layers_per_block: int | tuple[int] = 1,
resnet_eps: float = 1e-6,
resnet_time_scale_shift: str = "default",
resnet_act_fn: str = "swish",
resnet_groups: int = 32,
resnet_pre_norm: bool = True,
num_attention_heads: int = 1,
cross_attention_dim: int = 1280,
output_scale_factor: float = 1.0,
downsample_padding: int = 1,
add_downsample: bool = True,
dual_cross_attention: bool = False,
use_linear_projection: bool = False,
only_cross_attention: bool = False,
upcast_attention: bool = False,
attention_type: str = "default",
temporal_cross_attention_dim: int | None = None,
temporal_num_attention_heads: int = 8,
temporal_max_seq_length: int = 32,
temporal_transformer_layers_per_block: int | tuple[int] = 1,
temporal_double_self_attention: bool = True,
):
super().__init__()
resnets = []
attentions = []
motion_modules = []
self.has_cross_attention = True
self.num_attention_heads = num_attention_heads
# support for variable transformer layers per block
if isinstance(transformer_layers_per_block, int):
transformer_layers_per_block = (transformer_layers_per_block,) * num_layers
elif len(transformer_layers_per_block) != num_layers:
raise ValueError(
f"transformer_layers_per_block must be an integer or a list of integers of length {num_layers}"
)
# support for variable transformer layers per temporal block
if isinstance(temporal_transformer_layers_per_block, int):
temporal_transformer_layers_per_block = (temporal_transformer_layers_per_block,) * num_layers
elif len(temporal_transformer_layers_per_block) != num_layers:
raise ValueError(
f"temporal_transformer_layers_per_block must be an integer or a list of integers of length {num_layers}"
)
for i in range(num_layers):
in_channels = in_channels if i == 0 else out_channels
resnets.append(
ResnetBlock2D(
in_channels=in_channels,
out_channels=out_channels,
temb_channels=temb_channels,
eps=resnet_eps,
groups=resnet_groups,
dropout=dropout,
time_embedding_norm=resnet_time_scale_shift,
non_linearity=resnet_act_fn,
output_scale_factor=output_scale_factor,
pre_norm=resnet_pre_norm,
)
)
if not dual_cross_attention:
attentions.append(
Transformer2DModel(
num_attention_heads,
out_channels // num_attention_heads,
in_channels=out_channels,
num_layers=transformer_layers_per_block[i],
cross_attention_dim=cross_attention_dim,
norm_num_groups=resnet_groups,
use_linear_projection=use_linear_projection,
only_cross_attention=only_cross_attention,
upcast_attention=upcast_attention,
attention_type=attention_type,
)
)
else:
attentions.append(
DualTransformer2DModel(
num_attention_heads,
out_channels // num_attention_heads,
in_channels=out_channels,
num_layers=1,
cross_attention_dim=cross_attention_dim,
norm_num_groups=resnet_groups,
)
)
motion_modules.append(
AnimateDiffTransformer3D(
num_attention_heads=temporal_num_attention_heads,
in_channels=out_channels,
num_layers=temporal_transformer_layers_per_block[i],
norm_num_groups=resnet_groups,
cross_attention_dim=temporal_cross_attention_dim,
attention_bias=False,
activation_fn="geglu",
positional_embeddings="sinusoidal",
num_positional_embeddings=temporal_max_seq_length,
attention_head_dim=out_channels // temporal_num_attention_heads,
double_self_attention=temporal_double_self_attention,
)
)
self.attentions = nn.ModuleList(attentions)
self.resnets = nn.ModuleList(resnets)
self.motion_modules = nn.ModuleList(motion_modules)
if add_downsample:
self.downsamplers = nn.ModuleList(
[
Downsample2D(
out_channels,
use_conv=True,
out_channels=out_channels,
padding=downsample_padding,
name="op",
)
]
)
else:
self.downsamplers = None
self.gradient_checkpointing = False
def forward(
self,
hidden_states: torch.Tensor,
temb: torch.Tensor | None = None,
encoder_hidden_states: torch.Tensor | None = None,
attention_mask: torch.Tensor | None = None,
num_frames: int = 1,
encoder_attention_mask: torch.Tensor | None = None,
cross_attention_kwargs: dict[str, Any] | None = None,
additional_residuals: torch.Tensor | None = None,
):
if cross_attention_kwargs is not None:
if cross_attention_kwargs.get("scale", None) is not None:
logger.warning("Passing `scale` to `cross_attention_kwargs` is deprecated. `scale` will be ignored.")
output_states = ()
blocks = list(zip(self.resnets, self.attentions, self.motion_modules))
for i, (resnet, attn, motion_module) in enumerate(blocks):
if torch.is_grad_enabled() and self.gradient_checkpointing:
hidden_states = self._gradient_checkpointing_func(resnet, hidden_states, temb)
else:
hidden_states = resnet(input_tensor=hidden_states, temb=temb)
hidden_states = attn(
hidden_states=hidden_states,
encoder_hidden_states=encoder_hidden_states,
cross_attention_kwargs=cross_attention_kwargs,
attention_mask=attention_mask,
encoder_attention_mask=encoder_attention_mask,
return_dict=False,
)[0]
hidden_states = motion_module(hidden_states, num_frames=num_frames)
# apply additional residuals to the output of the last pair of resnet and attention blocks
if i == len(blocks) - 1 and additional_residuals is not None:
hidden_states = hidden_states + additional_residuals
output_states = output_states + (hidden_states,)
if self.downsamplers is not None:
for downsampler in self.downsamplers:
hidden_states = downsampler(hidden_states=hidden_states)
output_states = output_states + (hidden_states,)
return hidden_states, output_states
class CrossAttnUpBlockMotion(nn.Module):
def __init__(
self,
in_channels: int,
out_channels: int,
prev_output_channel: int,
temb_channels: int,
resolution_idx: int | None = None,
dropout: float = 0.0,
num_layers: int = 1,
transformer_layers_per_block: int | tuple[int] = 1,
resnet_eps: float = 1e-6,
resnet_time_scale_shift: str = "default",
resnet_act_fn: str = "swish",
resnet_groups: int = 32,
resnet_pre_norm: bool = True,
num_attention_heads: int = 1,
cross_attention_dim: int = 1280,
output_scale_factor: float = 1.0,
add_upsample: bool = True,
dual_cross_attention: bool = False,
use_linear_projection: bool = False,
only_cross_attention: bool = False,
upcast_attention: bool = False,
attention_type: str = "default",
temporal_cross_attention_dim: int | None = None,
temporal_num_attention_heads: int = 8,
temporal_max_seq_length: int = 32,
temporal_transformer_layers_per_block: int | tuple[int] = 1,
):
super().__init__()
resnets = []
attentions = []
motion_modules = []
self.has_cross_attention = True
self.num_attention_heads = num_attention_heads
# support for variable transformer layers per block
if isinstance(transformer_layers_per_block, int):
transformer_layers_per_block = (transformer_layers_per_block,) * num_layers
elif len(transformer_layers_per_block) != num_layers:
raise ValueError(
f"transformer_layers_per_block must be an integer or a list of integers of length {num_layers}, got {len(transformer_layers_per_block)}"
)
# support for variable transformer layers per temporal block
if isinstance(temporal_transformer_layers_per_block, int):
temporal_transformer_layers_per_block = (temporal_transformer_layers_per_block,) * num_layers
elif len(temporal_transformer_layers_per_block) != num_layers:
raise ValueError(
f"temporal_transformer_layers_per_block must be an integer or a list of integers of length {num_layers}, got {len(temporal_transformer_layers_per_block)}"
)
for i in range(num_layers):
res_skip_channels = in_channels if (i == num_layers - 1) else out_channels
resnet_in_channels = prev_output_channel if i == 0 else out_channels
resnets.append(
ResnetBlock2D(
in_channels=resnet_in_channels + res_skip_channels,
out_channels=out_channels,
temb_channels=temb_channels,
eps=resnet_eps,
groups=resnet_groups,
dropout=dropout,
time_embedding_norm=resnet_time_scale_shift,
non_linearity=resnet_act_fn,
output_scale_factor=output_scale_factor,
pre_norm=resnet_pre_norm,
)
)
if not dual_cross_attention:
attentions.append(
Transformer2DModel(
num_attention_heads,
out_channels // num_attention_heads,
in_channels=out_channels,
num_layers=transformer_layers_per_block[i],
cross_attention_dim=cross_attention_dim,
norm_num_groups=resnet_groups,
use_linear_projection=use_linear_projection,
only_cross_attention=only_cross_attention,
upcast_attention=upcast_attention,
attention_type=attention_type,
)
)
else:
attentions.append(
DualTransformer2DModel(
num_attention_heads,
out_channels // num_attention_heads,
in_channels=out_channels,
num_layers=1,
cross_attention_dim=cross_attention_dim,
norm_num_groups=resnet_groups,
)
)
motion_modules.append(
AnimateDiffTransformer3D(
num_attention_heads=temporal_num_attention_heads,
in_channels=out_channels,
num_layers=temporal_transformer_layers_per_block[i],
norm_num_groups=resnet_groups,
cross_attention_dim=temporal_cross_attention_dim,
attention_bias=False,
activation_fn="geglu",
positional_embeddings="sinusoidal",
num_positional_embeddings=temporal_max_seq_length,
attention_head_dim=out_channels // temporal_num_attention_heads,
)
)
self.attentions = nn.ModuleList(attentions)
self.resnets = nn.ModuleList(resnets)
self.motion_modules = nn.ModuleList(motion_modules)
if add_upsample:
self.upsamplers = nn.ModuleList([Upsample2D(out_channels, use_conv=True, out_channels=out_channels)])
else:
self.upsamplers = None
self.gradient_checkpointing = False
self.resolution_idx = resolution_idx
def forward(
self,
hidden_states: torch.Tensor,
res_hidden_states_tuple: tuple[torch.Tensor, ...],
temb: torch.Tensor | None = None,
encoder_hidden_states: torch.Tensor | None = None,
cross_attention_kwargs: dict[str, Any] | None = None,
upsample_size: int | None = None,
attention_mask: torch.Tensor | None = None,
encoder_attention_mask: torch.Tensor | None = None,
num_frames: int = 1,
) -> torch.Tensor:
if cross_attention_kwargs is not None:
if cross_attention_kwargs.get("scale", None) is not None:
logger.warning("Passing `scale` to `cross_attention_kwargs` is deprecated. `scale` will be ignored.")
is_freeu_enabled = (
getattr(self, "s1", None)
and getattr(self, "s2", None)
and getattr(self, "b1", None)
and getattr(self, "b2", None)
)
blocks = zip(self.resnets, self.attentions, self.motion_modules)
for resnet, attn, motion_module in blocks:
# pop res hidden states
res_hidden_states = res_hidden_states_tuple[-1]
res_hidden_states_tuple = res_hidden_states_tuple[:-1]
# FreeU: Only operate on the first two stages
if is_freeu_enabled:
hidden_states, res_hidden_states = apply_freeu(
self.resolution_idx,
hidden_states,
res_hidden_states,
s1=self.s1,
s2=self.s2,
b1=self.b1,
b2=self.b2,
)
hidden_states = torch.cat([hidden_states, res_hidden_states], dim=1)
if torch.is_grad_enabled() and self.gradient_checkpointing:
hidden_states = self._gradient_checkpointing_func(resnet, hidden_states, temb)
else:
hidden_states = resnet(input_tensor=hidden_states, temb=temb)
hidden_states = attn(
hidden_states=hidden_states,
encoder_hidden_states=encoder_hidden_states,
cross_attention_kwargs=cross_attention_kwargs,
attention_mask=attention_mask,
encoder_attention_mask=encoder_attention_mask,
return_dict=False,
)[0]
hidden_states = motion_module(hidden_states, num_frames=num_frames)
if self.upsamplers is not None:
for upsampler in self.upsamplers:
hidden_states = upsampler(hidden_states=hidden_states, output_size=upsample_size)
return hidden_states
class UpBlockMotion(nn.Module):
def __init__(
self,
in_channels: int,
prev_output_channel: int,
out_channels: int,
temb_channels: int,
resolution_idx: int | None = None,
dropout: float = 0.0,
num_layers: int = 1,
resnet_eps: float = 1e-6,
resnet_time_scale_shift: str = "default",
resnet_act_fn: str = "swish",
resnet_groups: int = 32,
resnet_pre_norm: bool = True,
output_scale_factor: float = 1.0,
add_upsample: bool = True,
temporal_cross_attention_dim: int | None = None,
temporal_num_attention_heads: int = 8,
temporal_max_seq_length: int = 32,
temporal_transformer_layers_per_block: int | tuple[int] = 1,
):
super().__init__()
resnets = []
motion_modules = []
# support for variable transformer layers per temporal block
if isinstance(temporal_transformer_layers_per_block, int):
temporal_transformer_layers_per_block = (temporal_transformer_layers_per_block,) * num_layers
elif len(temporal_transformer_layers_per_block) != num_layers:
raise ValueError(
f"temporal_transformer_layers_per_block must be an integer or a list of integers of length {num_layers}"
)
for i in range(num_layers):
res_skip_channels = in_channels if (i == num_layers - 1) else out_channels
resnet_in_channels = prev_output_channel if i == 0 else out_channels
resnets.append(
ResnetBlock2D(
in_channels=resnet_in_channels + res_skip_channels,
out_channels=out_channels,
temb_channels=temb_channels,
eps=resnet_eps,
groups=resnet_groups,
dropout=dropout,
time_embedding_norm=resnet_time_scale_shift,
non_linearity=resnet_act_fn,
output_scale_factor=output_scale_factor,
pre_norm=resnet_pre_norm,
)
)
motion_modules.append(
AnimateDiffTransformer3D(
num_attention_heads=temporal_num_attention_heads,
in_channels=out_channels,
num_layers=temporal_transformer_layers_per_block[i],
norm_num_groups=resnet_groups,
cross_attention_dim=temporal_cross_attention_dim,
attention_bias=False,
activation_fn="geglu",
positional_embeddings="sinusoidal",
num_positional_embeddings=temporal_max_seq_length,
attention_head_dim=out_channels // temporal_num_attention_heads,
)
)
self.resnets = nn.ModuleList(resnets)
self.motion_modules = nn.ModuleList(motion_modules)
if add_upsample:
self.upsamplers = nn.ModuleList([Upsample2D(out_channels, use_conv=True, out_channels=out_channels)])
else:
self.upsamplers = None
self.gradient_checkpointing = False
self.resolution_idx = resolution_idx
def forward(
self,
hidden_states: torch.Tensor,
res_hidden_states_tuple: tuple[torch.Tensor, ...],
temb: torch.Tensor | None = None,
upsample_size=None,
num_frames: int = 1,
*args,
**kwargs,
) -> torch.Tensor:
if len(args) > 0 or kwargs.get("scale", None) is not None:
deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`."
deprecate("scale", "1.0.0", deprecation_message)
is_freeu_enabled = (
getattr(self, "s1", None)
and getattr(self, "s2", None)
and getattr(self, "b1", None)
and getattr(self, "b2", None)
)
blocks = zip(self.resnets, self.motion_modules)
for resnet, motion_module in blocks:
# pop res hidden states
res_hidden_states = res_hidden_states_tuple[-1]
res_hidden_states_tuple = res_hidden_states_tuple[:-1]
# FreeU: Only operate on the first two stages
if is_freeu_enabled:
hidden_states, res_hidden_states = apply_freeu(
self.resolution_idx,
hidden_states,
res_hidden_states,
s1=self.s1,
s2=self.s2,
b1=self.b1,
b2=self.b2,
)
hidden_states = torch.cat([hidden_states, res_hidden_states], dim=1)
if torch.is_grad_enabled() and self.gradient_checkpointing:
hidden_states = self._gradient_checkpointing_func(resnet, hidden_states, temb)
else:
hidden_states = resnet(input_tensor=hidden_states, temb=temb)
hidden_states = motion_module(hidden_states, num_frames=num_frames)
if self.upsamplers is not None:
for upsampler in self.upsamplers:
hidden_states = upsampler(hidden_states=hidden_states, output_size=upsample_size)
return hidden_states
class UNetMidBlockCrossAttnMotion(nn.Module):
def __init__(
self,
in_channels: int,
temb_channels: int,
dropout: float = 0.0,
num_layers: int = 1,
transformer_layers_per_block: int | tuple[int] = 1,
resnet_eps: float = 1e-6,
resnet_time_scale_shift: str = "default",
resnet_act_fn: str = "swish",
resnet_groups: int = 32,
resnet_pre_norm: bool = True,
num_attention_heads: int = 1,
output_scale_factor: float = 1.0,
cross_attention_dim: int = 1280,
dual_cross_attention: bool = False,
use_linear_projection: bool = False,
upcast_attention: bool = False,
attention_type: str = "default",
temporal_num_attention_heads: int = 1,
temporal_cross_attention_dim: int | None = None,
temporal_max_seq_length: int = 32,
temporal_transformer_layers_per_block: int | tuple[int] = 1,
):
super().__init__()
self.has_cross_attention = True
self.num_attention_heads = num_attention_heads
resnet_groups = resnet_groups if resnet_groups is not None else min(in_channels // 4, 32)
# support for variable transformer layers per block
if isinstance(transformer_layers_per_block, int):
transformer_layers_per_block = (transformer_layers_per_block,) * num_layers
elif len(transformer_layers_per_block) != num_layers:
raise ValueError(
f"`transformer_layers_per_block` should be an integer or a list of integers of length {num_layers}."
)
# support for variable transformer layers per temporal block
if isinstance(temporal_transformer_layers_per_block, int):
temporal_transformer_layers_per_block = (temporal_transformer_layers_per_block,) * num_layers
elif len(temporal_transformer_layers_per_block) != num_layers:
raise ValueError(
f"`temporal_transformer_layers_per_block` should be an integer or a list of integers of length {num_layers}."
)
# there is always at least one resnet
resnets = [
ResnetBlock2D(
in_channels=in_channels,
out_channels=in_channels,
temb_channels=temb_channels,
eps=resnet_eps,
groups=resnet_groups,
dropout=dropout,
time_embedding_norm=resnet_time_scale_shift,
non_linearity=resnet_act_fn,
output_scale_factor=output_scale_factor,
pre_norm=resnet_pre_norm,
)
]
attentions = []
motion_modules = []
for i in range(num_layers):
if not dual_cross_attention:
attentions.append(
Transformer2DModel(
num_attention_heads,
in_channels // num_attention_heads,
in_channels=in_channels,
num_layers=transformer_layers_per_block[i],
cross_attention_dim=cross_attention_dim,
norm_num_groups=resnet_groups,
use_linear_projection=use_linear_projection,
upcast_attention=upcast_attention,
attention_type=attention_type,
)
)
else:
attentions.append(
DualTransformer2DModel(
num_attention_heads,
in_channels // num_attention_heads,
in_channels=in_channels,
num_layers=1,
cross_attention_dim=cross_attention_dim,
norm_num_groups=resnet_groups,
)
)
resnets.append(
ResnetBlock2D(
in_channels=in_channels,
out_channels=in_channels,
temb_channels=temb_channels,
eps=resnet_eps,
groups=resnet_groups,
dropout=dropout,
time_embedding_norm=resnet_time_scale_shift,
non_linearity=resnet_act_fn,
output_scale_factor=output_scale_factor,
pre_norm=resnet_pre_norm,
)
)
motion_modules.append(
AnimateDiffTransformer3D(
num_attention_heads=temporal_num_attention_heads,
attention_head_dim=in_channels // temporal_num_attention_heads,
in_channels=in_channels,
num_layers=temporal_transformer_layers_per_block[i],
norm_num_groups=resnet_groups,
cross_attention_dim=temporal_cross_attention_dim,
attention_bias=False,
positional_embeddings="sinusoidal",
num_positional_embeddings=temporal_max_seq_length,
activation_fn="geglu",
)
)
self.attentions = nn.ModuleList(attentions)
self.resnets = nn.ModuleList(resnets)
self.motion_modules = nn.ModuleList(motion_modules)
self.gradient_checkpointing = False
def forward(
self,
hidden_states: torch.Tensor,
temb: torch.Tensor | None = None,
encoder_hidden_states: torch.Tensor | None = None,
attention_mask: torch.Tensor | None = None,
cross_attention_kwargs: dict[str, Any] | None = None,
encoder_attention_mask: torch.Tensor | None = None,
num_frames: int = 1,
) -> torch.Tensor:
if cross_attention_kwargs is not None:
if cross_attention_kwargs.get("scale", None) is not None:
logger.warning("Passing `scale` to `cross_attention_kwargs` is deprecated. `scale` will be ignored.")
hidden_states = self.resnets[0](input_tensor=hidden_states, temb=temb)
blocks = zip(self.attentions, self.resnets[1:], self.motion_modules)
for attn, resnet, motion_module in blocks:
hidden_states = attn(
hidden_states=hidden_states,
encoder_hidden_states=encoder_hidden_states,