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# Copyright 2024 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 typing import Optional, Union, Tuple
import torch
import torch.nn.functional as F
from torch import nn
from diffusers.utils import logging
from diffusers.models.attention_processor import Attention
logger = logging.get_logger(__name__) # pylint: disable=invalid-name
class CustomLiteLAProcessor2_0:
"""Attention processor used typically in processing the SD3-like self-attention projections. add rms norm for query and key and apply RoPE"""
def __init__(self):
self.kernel_func = nn.ReLU(inplace=False)
self.eps = 1e-15
self.pad_val = 1.0
def apply_rotary_emb(
self,
x: torch.Tensor,
freqs_cis: Union[torch.Tensor, Tuple[torch.Tensor]],
) -> 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 or key 'x' 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:
x (`torch.Tensor`):
Query or key tensor to apply rotary embeddings. [B, H, S, D] xk (torch.Tensor): Key tensor to apply
freqs_cis (`Tuple[torch.Tensor]`): Precomputed frequency tensor for complex exponentials. ([S, D], [S, D],)
Returns:
Tuple[torch.Tensor, torch.Tensor]: Tuple of modified query tensor and key tensor with rotary embeddings.
"""
cos, sin = freqs_cis # [S, D]
cos = cos[None, None]
sin = sin[None, None]
cos, sin = cos.to(x.device), sin.to(x.device)
x_real, x_imag = x.reshape(*x.shape[:-1], -1, 2).unbind(-1) # [B, S, H, D//2]
x_rotated = torch.stack([-x_imag, x_real], dim=-1).flatten(3)
out = (x.float() * cos + x_rotated.float() * sin).to(x.dtype)
return out
def __call__(
self,
attn: Attention,
hidden_states: torch.FloatTensor,
encoder_hidden_states: torch.FloatTensor = None,
attention_mask: Optional[torch.FloatTensor] = None,
encoder_attention_mask: Optional[torch.FloatTensor] = None,
rotary_freqs_cis: Union[torch.Tensor, Tuple[torch.Tensor]] = None,
rotary_freqs_cis_cross: Union[torch.Tensor, Tuple[torch.Tensor]] = None,
*args,
**kwargs,
) -> torch.FloatTensor:
hidden_states_len = hidden_states.shape[1]
input_ndim = hidden_states.ndim
if input_ndim == 4:
batch_size, channel, height, width = hidden_states.shape
hidden_states = hidden_states.view(batch_size, channel, height * width).transpose(1, 2)
if encoder_hidden_states is not None:
context_input_ndim = encoder_hidden_states.ndim
if context_input_ndim == 4:
batch_size, channel, height, width = encoder_hidden_states.shape
encoder_hidden_states = encoder_hidden_states.view(batch_size, channel, height * width).transpose(1, 2)
batch_size = hidden_states.shape[0]
# `sample` projections.
dtype = hidden_states.dtype
query = attn.to_q(hidden_states)
key = attn.to_k(hidden_states)
value = attn.to_v(hidden_states)
# `context` projections.
has_encoder_hidden_state_proj = hasattr(attn, "add_q_proj") and hasattr(attn, "add_k_proj") and hasattr(attn, "add_v_proj")
if encoder_hidden_states is not None and has_encoder_hidden_state_proj:
encoder_hidden_states_query_proj = attn.add_q_proj(encoder_hidden_states)
encoder_hidden_states_key_proj = attn.add_k_proj(encoder_hidden_states)
encoder_hidden_states_value_proj = attn.add_v_proj(encoder_hidden_states)
# attention
if not attn.is_cross_attention:
query = torch.cat([query, encoder_hidden_states_query_proj], dim=1)
key = torch.cat([key, encoder_hidden_states_key_proj], dim=1)
value = torch.cat([value, encoder_hidden_states_value_proj], dim=1)
else:
query = hidden_states
key = encoder_hidden_states
value = encoder_hidden_states
inner_dim = key.shape[-1]
head_dim = inner_dim // attn.heads
query = query.transpose(-1, -2).reshape(batch_size, attn.heads, head_dim, -1)
key = key.transpose(-1, -2).reshape(batch_size, attn.heads, head_dim, -1).transpose(-1, -2)
value = value.transpose(-1, -2).reshape(batch_size, attn.heads, head_dim, -1)
# RoPE需要 [B, H, S, D] 输入
# 此时 query是 [B, H, D, S], 需要转成 [B, H, S, D] 才能应用RoPE
query = query.permute(0, 1, 3, 2) # [B, H, S, D] (从 [B, H, D, S])
# Apply query and key normalization if needed
if attn.norm_q is not None:
query = attn.norm_q(query)
if attn.norm_k is not None:
key = attn.norm_k(key)
# Apply RoPE if needed
if rotary_freqs_cis is not None:
query = self.apply_rotary_emb(query, rotary_freqs_cis)
if not attn.is_cross_attention:
key = self.apply_rotary_emb(key, rotary_freqs_cis)
elif rotary_freqs_cis_cross is not None and has_encoder_hidden_state_proj:
key = self.apply_rotary_emb(key, rotary_freqs_cis_cross)
# 此时 query是 [B, H, S, D]，需要还原成 [B, H, D, S]
query = query.permute(0, 1, 3, 2) # [B, H, D, S]
if attention_mask is not None:
# attention_mask: [B, S] -> [B, 1, S, 1]
attention_mask = attention_mask[:, None, :, None].to(key.dtype) # [B, 1, S, 1]
query = query * attention_mask.permute(0, 1, 3, 2) # [B, H, S, D] * [B, 1, S, 1]
if not attn.is_cross_attention:
key = key * attention_mask # key: [B, h, S, D] 与 mask [B, 1, S, 1] 相乘
value = value * attention_mask.permute(0, 1, 3, 2) # 如果 value 是 [B, h, D, S]，那么需调整mask以匹配S维度
if attn.is_cross_attention and encoder_attention_mask is not None and has_encoder_hidden_state_proj:
encoder_attention_mask = encoder_attention_mask[:, None, :, None].to(key.dtype) # [B, 1, S_enc, 1]
# 此时 key: [B, h, S_enc, D], value: [B, h, D, S_enc]
key = key * encoder_attention_mask # [B, h, S_enc, D] * [B, 1, S_enc, 1]
value = value * encoder_attention_mask.permute(0, 1, 3, 2) # [B, h, D, S_enc] * [B, 1, 1, S_enc]
query = self.kernel_func(query)
key = self.kernel_func(key)
query, key, value = query.float(), key.float(), value.float()
value = F.pad(value, (0, 0, 0, 1), mode="constant", value=self.pad_val)
vk = torch.matmul(value, key)
hidden_states = torch.matmul(vk, query)
if hidden_states.dtype in [torch.float16, torch.bfloat16]:
hidden_states = hidden_states.float()
hidden_states = hidden_states[:, :, :-1] / (hidden_states[:, :, -1:] + self.eps)
hidden_states = hidden_states.view(batch_size, attn.heads * head_dim, -1).permute(0, 2, 1)
hidden_states = hidden_states.to(dtype)
if encoder_hidden_states is not None:
encoder_hidden_states = encoder_hidden_states.to(dtype)
# Split the attention outputs.
if encoder_hidden_states is not None and not attn.is_cross_attention and has_encoder_hidden_state_proj:
hidden_states, encoder_hidden_states = (
hidden_states[:, : hidden_states_len],
hidden_states[:, hidden_states_len:],
)
# linear proj
hidden_states = attn.to_out[0](hidden_states)
# dropout
hidden_states = attn.to_out[1](hidden_states)
if encoder_hidden_states is not None and not attn.context_pre_only and not attn.is_cross_attention and hasattr(attn, "to_add_out"):
encoder_hidden_states = attn.to_add_out(encoder_hidden_states)
if input_ndim == 4:
hidden_states = hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)
if encoder_hidden_states is not None and context_input_ndim == 4:
encoder_hidden_states = encoder_hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)
if torch.get_autocast_gpu_dtype() == torch.float16:
hidden_states = hidden_states.clip(-65504, 65504)
if encoder_hidden_states is not None:
encoder_hidden_states = encoder_hidden_states.clip(-65504, 65504)
return hidden_states, encoder_hidden_states
class CustomerAttnProcessor2_0:
r"""
Processor for implementing scaled dot-product attention (enabled by default if you're using PyTorch 2.0).
"""
def __init__(self):
if not hasattr(F, "scaled_dot_product_attention"):
raise ImportError("AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0.")
def apply_rotary_emb(
self,
x: torch.Tensor,
freqs_cis: Union[torch.Tensor, Tuple[torch.Tensor]],
) -> 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 or key 'x' 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:
x (`torch.Tensor`):
Query or key tensor to apply rotary embeddings. [B, H, S, D] xk (torch.Tensor): Key tensor to apply
freqs_cis (`Tuple[torch.Tensor]`): Precomputed frequency tensor for complex exponentials. ([S, D], [S, D],)
Returns:
Tuple[torch.Tensor, torch.Tensor]: Tuple of modified query tensor and key tensor with rotary embeddings.
"""
cos, sin = freqs_cis # [S, D]
cos = cos[None, None]
sin = sin[None, None]
cos, sin = cos.to(x.device), sin.to(x.device)
x_real, x_imag = x.reshape(*x.shape[:-1], -1, 2).unbind(-1) # [B, S, H, D//2]
x_rotated = torch.stack([-x_imag, x_real], dim=-1).flatten(3)
out = (x.float() * cos + x_rotated.float() * sin).to(x.dtype)
return out
def __call__(
self,
attn: Attention,
hidden_states: torch.FloatTensor,
encoder_hidden_states: torch.FloatTensor = None,
attention_mask: Optional[torch.FloatTensor] = None,
encoder_attention_mask: Optional[torch.FloatTensor] = None,
rotary_freqs_cis: Union[torch.Tensor, Tuple[torch.Tensor]] = None,
rotary_freqs_cis_cross: Union[torch.Tensor, Tuple[torch.Tensor]] = None,
*args,
**kwargs,
) -> torch.Tensor:
residual = hidden_states
input_ndim = hidden_states.ndim
if input_ndim == 4:
batch_size, channel, height, width = hidden_states.shape
hidden_states = hidden_states.view(batch_size, channel, height * width).transpose(1, 2)
batch_size, sequence_length, _ = (
hidden_states.shape if encoder_hidden_states is None else encoder_hidden_states.shape
)
has_encoder_hidden_state_proj = hasattr(attn, "add_q_proj") and hasattr(attn, "add_k_proj") and hasattr(attn, "add_v_proj")
if attn.group_norm is not None:
hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2)
query = attn.to_q(hidden_states)
if encoder_hidden_states is None:
encoder_hidden_states = hidden_states
elif attn.norm_cross:
encoder_hidden_states = attn.norm_encoder_hidden_states(encoder_hidden_states)
key = attn.to_k(encoder_hidden_states)
value = attn.to_v(encoder_hidden_states)
inner_dim = key.shape[-1]
head_dim = inner_dim // attn.heads
query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2)
if attn.norm_q is not None:
query = attn.norm_q(query)
if attn.norm_k is not None:
key = attn.norm_k(key)
# Apply RoPE if needed
if rotary_freqs_cis is not None:
query = self.apply_rotary_emb(query, rotary_freqs_cis)
if not attn.is_cross_attention:
key = self.apply_rotary_emb(key, rotary_freqs_cis)
elif rotary_freqs_cis_cross is not None and has_encoder_hidden_state_proj:
key = self.apply_rotary_emb(key, rotary_freqs_cis_cross)
if attn.is_cross_attention and encoder_attention_mask is not None and has_encoder_hidden_state_proj:
# attention_mask: N x S1
# encoder_attention_mask: N x S2
# cross attention 整合attention_mask和encoder_attention_mask
combined_mask = attention_mask[:, :, None] * encoder_attention_mask[:, None, :]
attention_mask = torch.where(combined_mask == 1, 0.0, -torch.inf)
attention_mask = attention_mask[:, None, :, :].expand(-1, attn.heads, -1, -1).to(query.dtype)
elif not attn.is_cross_attention and attention_mask is not None:
attention_mask = attn.prepare_attention_mask(attention_mask, sequence_length, batch_size)
# scaled_dot_product_attention expects attention_mask shape to be
# (batch, heads, source_length, target_length)
attention_mask = attention_mask.view(batch_size, attn.heads, -1, attention_mask.shape[-1])
# the output of sdp = (batch, num_heads, seq_len, head_dim)
# TODO: add support for attn.scale when we move to Torch 2.1
hidden_states = F.scaled_dot_product_attention(
query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False
)
hidden_states = hidden_states.transpose(1, 2).reshape(batch_size, -1, attn.heads * head_dim)
hidden_states = hidden_states.to(query.dtype)
# linear proj
hidden_states = attn.to_out[0](hidden_states)
# dropout
hidden_states = attn.to_out[1](hidden_states)
if input_ndim == 4:
hidden_states = hidden_states.transpose(-1, -2).reshape(batch_size, channel, height, width)
if attn.residual_connection:
hidden_states = hidden_states + residual
hidden_states = hidden_states / attn.rescale_output_factor
return hidden_states