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# Adapted from https://github.com/magic-research/magic-animate/blob/main/magicanimate/models/mutual_self_attention.py
from typing import Any, Dict, Optional
import torch
from einops import rearrange
from .attention import BasicTransformerBlock
from .attention import TemporalBasicTransformerBlock
def torch_dfs(model: torch.nn.Module):
result = [model]
for child in model.children():
result += torch_dfs(child)
return result
class ReferenceAttentionControl:
def __init__(
self,
unet,
mode="write",
do_classifier_free_guidance=False,
attention_auto_machine_weight=float("inf"),
gn_auto_machine_weight=1.0,
style_fidelity=1.0,
reference_attn=True,
reference_adain=False,
fusion_blocks="midup",
batch_size=1,
reference_attention_weight=1.,
audio_attention_weight=1.,
) -> None:
# 10. Modify self attention and group norm
self.unet = unet
assert mode in ["read", "write"]
assert fusion_blocks in ["midup", "full"]
self.reference_attn = reference_attn
self.reference_adain = reference_adain
self.fusion_blocks = fusion_blocks
self.reference_attention_weight = reference_attention_weight
self.audio_attention_weight = audio_attention_weight
self.register_reference_hooks(
mode,
do_classifier_free_guidance,
attention_auto_machine_weight,
gn_auto_machine_weight,
style_fidelity,
reference_attn,
reference_adain,
fusion_blocks,
batch_size=batch_size,
)
def register_reference_hooks(
self,
mode,
do_classifier_free_guidance,
attention_auto_machine_weight,
gn_auto_machine_weight,
style_fidelity,
reference_attn,
reference_adain,
dtype=torch.float16,
batch_size=1,
num_images_per_prompt=1,
device=torch.device("cpu"),
fusion_blocks="midup",
):
MODE = mode
do_classifier_free_guidance = do_classifier_free_guidance
attention_auto_machine_weight = attention_auto_machine_weight
gn_auto_machine_weight = gn_auto_machine_weight
style_fidelity = style_fidelity
reference_attn = reference_attn
reference_adain = reference_adain
fusion_blocks = fusion_blocks
num_images_per_prompt = num_images_per_prompt
reference_attention_weight = self.reference_attention_weight
audio_attention_weight = self.audio_attention_weight
dtype = dtype
if do_classifier_free_guidance:
uc_mask = (
torch.Tensor(
[1] * batch_size * num_images_per_prompt * 16
+ [0] * batch_size * num_images_per_prompt * 16
)
.to(device)
.bool()
)
else:
uc_mask = (
torch.Tensor([0] * batch_size * num_images_per_prompt * 2)
.to(device)
.bool()
)
def hacked_basic_transformer_inner_forward(
self,
hidden_states: torch.FloatTensor,
attention_mask: Optional[torch.FloatTensor] = None,
encoder_hidden_states: Optional[torch.FloatTensor] = None,
encoder_attention_mask: Optional[torch.FloatTensor] = None,
timestep: Optional[torch.LongTensor] = None,
cross_attention_kwargs: Dict[str, Any] = None,
class_labels: Optional[torch.LongTensor] = None,
video_length=None,
):
if self.use_ada_layer_norm: # False
norm_hidden_states = self.norm1(hidden_states, timestep)
elif self.use_ada_layer_norm_zero:
(
norm_hidden_states,
gate_msa,
shift_mlp,
scale_mlp,
gate_mlp,
) = self.norm1(
hidden_states,
timestep,
class_labels,
hidden_dtype=hidden_states.dtype,
)
else:
norm_hidden_states = self.norm1(hidden_states)
# 1. Self-Attention
# self.only_cross_attention = False
cross_attention_kwargs = (
cross_attention_kwargs if cross_attention_kwargs is not None else {}
)
if self.only_cross_attention:
attn_output = self.attn1(
norm_hidden_states,
encoder_hidden_states=encoder_hidden_states
if self.only_cross_attention
else None,
attention_mask=attention_mask,
**cross_attention_kwargs,
)
else:
if MODE == "write":
attn_output = self.attn1(
norm_hidden_states,
encoder_hidden_states=encoder_hidden_states
if self.only_cross_attention
else None,
attention_mask=attention_mask,
**cross_attention_kwargs,
)
if self.use_ada_layer_norm_zero:
attn_output = gate_msa.unsqueeze(1) * attn_output
hidden_states = attn_output + hidden_states
if self.attn2 is not None:
norm_hidden_states = (
self.norm2(hidden_states, timestep)
if self.use_ada_layer_norm
else self.norm2(hidden_states)
)
self.bank.append(norm_hidden_states.clone())
# 2. Cross-Attention
attn_output = self.attn2(
norm_hidden_states,
encoder_hidden_states=encoder_hidden_states,
attention_mask=encoder_attention_mask,
**cross_attention_kwargs,
)
hidden_states = attn_output + hidden_states
if MODE == "read":
hidden_states = (
self.attn1(
norm_hidden_states,
encoder_hidden_states=norm_hidden_states,
attention_mask=attention_mask,
)
+ hidden_states
)
if self.use_ada_layer_norm: # False
norm_hidden_states = self.norm1_5(hidden_states, timestep)
elif self.use_ada_layer_norm_zero:
(
norm_hidden_states,
gate_msa,
shift_mlp,
scale_mlp,
gate_mlp,
) = self.norm1_5(
hidden_states,
timestep,
class_labels,
hidden_dtype=hidden_states.dtype,
)
else:
norm_hidden_states = self.norm1_5(hidden_states)
bank_fea = []
for d in self.bank:
if len(d.shape) == 3:
d = d.unsqueeze(1).repeat(1, video_length, 1, 1)
bank_fea.append(rearrange(d, "b t l c -> (b t) l c"))
attn_hidden_states = self.attn1_5(
norm_hidden_states,
encoder_hidden_states=bank_fea[0],
attention_mask=attention_mask,
)
if reference_attention_weight != 1.:
attn_hidden_states *= reference_attention_weight
hidden_states = (attn_hidden_states + hidden_states)
# self.bank.clear()
if self.attn2 is not None:
# Cross-Attention
norm_hidden_states = (
self.norm2(hidden_states, timestep)
if self.use_ada_layer_norm
else self.norm2(hidden_states)
)
attn_hidden_states = self.attn2(
norm_hidden_states,
encoder_hidden_states=encoder_hidden_states,
attention_mask=attention_mask,
)
if audio_attention_weight != 1.:
attn_hidden_states *= audio_attention_weight
hidden_states = (attn_hidden_states + hidden_states)
# Feed-forward
hidden_states = self.ff(self.norm3(hidden_states)) + hidden_states
# Temporal-Attention
if self.unet_use_temporal_attention:
d = hidden_states.shape[1]
hidden_states = rearrange(
hidden_states, "(b f) d c -> (b d) f c", f=video_length
)
norm_hidden_states = (
self.norm_temp(hidden_states, timestep)
if self.use_ada_layer_norm
else self.norm_temp(hidden_states)
)
hidden_states = (
self.attn_temp(norm_hidden_states) + hidden_states
)
hidden_states = rearrange(
hidden_states, "(b d) f c -> (b f) d c", d=d
)
return hidden_states
# 3. Feed-forward
norm_hidden_states = self.norm3(hidden_states)
if self.use_ada_layer_norm_zero:
norm_hidden_states = (
norm_hidden_states * (1 + scale_mlp[:, None]) + shift_mlp[:, None]
)
ff_output = self.ff(norm_hidden_states)
if self.use_ada_layer_norm_zero:
ff_output = gate_mlp.unsqueeze(1) * ff_output
hidden_states = ff_output + hidden_states
return hidden_states
if self.reference_attn:
if self.fusion_blocks == "midup":
attn_modules = [
module
for module in (
torch_dfs(self.unet.mid_block) + torch_dfs(self.unet.up_blocks)
)
if isinstance(module, BasicTransformerBlock)
or isinstance(module, TemporalBasicTransformerBlock)
]
elif self.fusion_blocks == "full":
attn_modules = [
module
for module in torch_dfs(self.unet)
if isinstance(module, BasicTransformerBlock)
or isinstance(module, TemporalBasicTransformerBlock)
]
attn_modules = sorted(
attn_modules, key=lambda x: -x.norm1.normalized_shape[0]
)
for i, module in enumerate(attn_modules):
module._original_inner_forward = module.forward
if isinstance(module, BasicTransformerBlock):
module.forward = hacked_basic_transformer_inner_forward.__get__(
module, BasicTransformerBlock
)
if isinstance(module, TemporalBasicTransformerBlock):
module.forward = hacked_basic_transformer_inner_forward.__get__(
module, TemporalBasicTransformerBlock
)
module.bank = []
module.attn_weight = float(i) / float(len(attn_modules))
def update(
self,
writer,
do_classifier_free_guidance=True,
dtype=torch.float16,
):
if self.reference_attn:
if self.fusion_blocks == "midup":
reader_attn_modules = [
module
for module in (torch_dfs(self.unet.mid_block) + torch_dfs(self.unet.up_blocks))
if isinstance(module, TemporalBasicTransformerBlock)
]
writer_attn_modules = [
module
for module in (torch_dfs(writer.unet.mid_block) + torch_dfs(writer.unet.up_blocks))
if isinstance(module, BasicTransformerBlock)
]
elif self.fusion_blocks == "full":
reader_attn_modules = [
module
for module in torch_dfs(self.unet)
if isinstance(module, TemporalBasicTransformerBlock)
]
writer_attn_modules = [
module
for module in torch_dfs(writer.unet)
if isinstance(module, BasicTransformerBlock)
]
reader_attn_modules = sorted(
reader_attn_modules, key=lambda x: -x.norm1.normalized_shape[0]
)
writer_attn_modules = sorted(
writer_attn_modules, key=lambda x: -x.norm1.normalized_shape[0]
)
for r, w in zip(reader_attn_modules, writer_attn_modules):
if do_classifier_free_guidance:
r.bank = [torch.cat([torch.zeros_like(v), v]).to(dtype) for v in w.bank]
else:
r.bank = [v.clone().to(dtype) for v in w.bank]
def clear(self):
if self.reference_attn:
if self.fusion_blocks == "midup":
reader_attn_modules = [
module
for module in (
torch_dfs(self.unet.mid_block) + torch_dfs(self.unet.up_blocks)
)
if isinstance(module, BasicTransformerBlock)
or isinstance(module, TemporalBasicTransformerBlock)
]
elif self.fusion_blocks == "full":
reader_attn_modules = [
module
for module in torch_dfs(self.unet)
if isinstance(module, BasicTransformerBlock)
or isinstance(module, TemporalBasicTransformerBlock)
]
reader_attn_modules = sorted(
reader_attn_modules, key=lambda x: -x.norm1.normalized_shape[0]
)
for r in reader_attn_modules:
r.bank.clear()
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