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# Adapted from https://github.com/magic-research/magic-animate/blob/main/magicanimate/models/mutual_self_attention.py
import torch
import torch.nn.functional as F
import random
from einops import rearrange
from typing import Any, Callable, Dict, List, Optional, Tuple, Union
from diffusers.models.attention import BasicTransformerBlock
from .attention import BasicTransformerBlock as _BasicTransformerBlock
def torch_dfs(model: torch.nn.Module):
result = [model]
for child in model.children():
result += torch_dfs(child)
return result
def calc_mean_std(feat, eps: float = 1e-5):
feat_std = (feat.var(dim=-2, keepdims=True) + eps).sqrt()
feat_mean = feat.mean(dim=-2, keepdims=True)
return feat_mean, feat_std
class ReferenceNetAttention():
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,
fusion_blocks="full",
batch_size=1,
is_image=False,
) -> 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.fusion_blocks = fusion_blocks
self.register_reference_hooks(
mode,
do_classifier_free_guidance,
attention_auto_machine_weight,
gn_auto_machine_weight,
style_fidelity,
reference_attn,
fusion_blocks,
batch_size=batch_size,
is_image=is_image,
)
def register_reference_hooks(
self,
mode,
do_classifier_free_guidance,
attention_auto_machine_weight,
gn_auto_machine_weight,
style_fidelity,
reference_attn,
# dtype=torch.float16,
dtype=torch.float32,
batch_size=1,
num_images_per_prompt=1,
device=torch.device("cpu"),
fusion_blocks='midup',
is_image=False,
):
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
fusion_blocks = fusion_blocks
num_images_per_prompt = num_images_per_prompt
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:
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
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":
self.bank.append(norm_hidden_states.clone())
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 MODE == "read":
if not is_image:
self.bank = [rearrange(d.unsqueeze(1).repeat(1, video_length, 1, 1), "b t l c -> (b t) l c")[:hidden_states.shape[0]] for d in self.bank]
modify_norm_hidden_states = torch.cat([norm_hidden_states] + self.bank, dim=1)
hidden_states_uc = self.attn1(modify_norm_hidden_states,
encoder_hidden_states=modify_norm_hidden_states,
attention_mask=attention_mask)[:,:hidden_states.shape[-2],:] #+ hidden_states
hidden_states_raw = self.attn1(norm_hidden_states,
encoder_hidden_states=norm_hidden_states,
attention_mask=attention_mask) #+ hidden_states
ratio = 0.5
hidden_states_uc = hidden_states_uc * ratio + hidden_states_raw * (1-ratio) + hidden_states
hidden_states_c = hidden_states_uc.clone()
_uc_mask = uc_mask.clone()
if do_classifier_free_guidance:
if hidden_states.shape[0] != _uc_mask.shape[0]:
_uc_mask = (
torch.Tensor([1] * (hidden_states.shape[0]//2) + [0] * (hidden_states.shape[0]//2))
.to(device)
.bool()
)
hidden_states_c[_uc_mask] = self.attn1(
norm_hidden_states[_uc_mask],
encoder_hidden_states=norm_hidden_states[_uc_mask],
attention_mask=attention_mask,
) + hidden_states[_uc_mask]
# randomly drop the reference attention during training
else:
mask_index = [0 for _ in range(hidden_states_c.shape[0])]
for i in range( int(hidden_states_c.shape[0] * 0.25)):
mask_index[i] = 1
_uc_mask = (
torch.Tensor(mask_index)
.to(device)
.bool()
)
hidden_states_c[_uc_mask] = self.attn1(
norm_hidden_states[_uc_mask],
encoder_hidden_states=norm_hidden_states[_uc_mask],
attention_mask=attention_mask,
) + hidden_states[_uc_mask]
hidden_states = hidden_states_c.clone()
# 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)
)
hidden_states = (
self.attn2(
norm_hidden_states, encoder_hidden_states=encoder_hidden_states, attention_mask=attention_mask
)
+ hidden_states
)
# Feed-forward
hidden_states = self.ff(self.norm3(hidden_states)) + hidden_states
# Temporal-Attention
if not is_image:
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
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)
)
# 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
# 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, _BasicTransformerBlock)]
elif self.fusion_blocks == "full":
attn_modules = [module for module in torch_dfs(self.unet) if isinstance(module, BasicTransformerBlock) or isinstance(module, _BasicTransformerBlock)]
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
module.forward = hacked_basic_transformer_inner_forward.__get__(module, BasicTransformerBlock)
module.bank = []
module.attn_weight = float(i) / float(len(attn_modules))
# def update(self, writer, dtype=torch.float16):
def update(self, writer, dtype=torch.float32):
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, BasicTransformerBlock)]
writer_attn_modules = [module for module in (torch_dfs(writer.unet.mid_block)+torch_dfs(writer.unet.up_blocks)) if isinstance(module, _BasicTransformerBlock) or isinstance(module, BasicTransformerBlock)]
elif self.fusion_blocks == "full":
reader_attn_modules = [module for module in torch_dfs(self.unet) if isinstance(module, _BasicTransformerBlock) or isinstance(module, BasicTransformerBlock)]
writer_attn_modules = [module for module in torch_dfs(writer.unet) if isinstance(module, _BasicTransformerBlock) or 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])
if len(reader_attn_modules) == 0:
print('reader_attn_modules is null')
assert False
if len(writer_attn_modules) == 0:
print('writer_attn_modules is null')
assert False
for r, w in zip(reader_attn_modules, writer_attn_modules):
r.bank = [v.clone().to(dtype) for v in w.bank]
# w.bank.clear()
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, _BasicTransformerBlock)]
elif self.fusion_blocks == "full":
reader_attn_modules = [module for module in torch_dfs(self.unet) if isinstance(module, BasicTransformerBlock) or isinstance(module, _BasicTransformerBlock)]
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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