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Running
on
Zero
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from typing import Optional
import torch
import torch.nn.functional as F
from diffusers.models.attention import Attention
from diffusers.models.embeddings import apply_rotary_emb
from .fuser import (get_sequence_parallel_rank,
get_sequence_parallel_world_size, get_sp_group,
init_distributed_environment, initialize_model_parallel,
xFuserLongContextAttention)
class CogVideoXMultiGPUsAttnProcessor2_0:
r"""
Processor for implementing scaled dot-product attention for the CogVideoX model. It applies a rotary embedding on
query and key vectors, but does not include spatial normalization.
"""
def __init__(self):
if xFuserLongContextAttention is not None:
try:
self.hybrid_seq_parallel_attn = xFuserLongContextAttention()
except Exception:
self.hybrid_seq_parallel_attn = None
else:
self.hybrid_seq_parallel_attn = None
if not hasattr(F, "scaled_dot_product_attention"):
raise ImportError("CogVideoXAttnProcessor requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0.")
def __call__(
self,
attn: Attention,
hidden_states: torch.Tensor,
encoder_hidden_states: torch.Tensor,
attention_mask: Optional[torch.Tensor] = None,
image_rotary_emb: Optional[torch.Tensor] = None,
) -> torch.Tensor:
text_seq_length = encoder_hidden_states.size(1)
hidden_states = torch.cat([encoder_hidden_states, hidden_states], dim=1)
batch_size, sequence_length, _ = (
hidden_states.shape if encoder_hidden_states is None else encoder_hidden_states.shape
)
if attention_mask is not None:
attention_mask = attn.prepare_attention_mask(attention_mask, sequence_length, batch_size)
attention_mask = attention_mask.view(batch_size, attn.heads, -1, attention_mask.shape[-1])
query = attn.to_q(hidden_states)
key = attn.to_k(hidden_states)
value = attn.to_v(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 image_rotary_emb is not None:
query[:, :, text_seq_length:] = apply_rotary_emb(query[:, :, text_seq_length:], image_rotary_emb)
if not attn.is_cross_attention:
key[:, :, text_seq_length:] = apply_rotary_emb(key[:, :, text_seq_length:], image_rotary_emb)
if self.hybrid_seq_parallel_attn is None:
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
else:
img_q = query[:, :, text_seq_length:].transpose(1, 2)
txt_q = query[:, :, :text_seq_length].transpose(1, 2)
img_k = key[:, :, text_seq_length:].transpose(1, 2)
txt_k = key[:, :, :text_seq_length].transpose(1, 2)
img_v = value[:, :, text_seq_length:].transpose(1, 2)
txt_v = value[:, :, :text_seq_length].transpose(1, 2)
hidden_states = self.hybrid_seq_parallel_attn(
None,
img_q, img_k, img_v, dropout_p=0.0, causal=False,
joint_tensor_query=txt_q,
joint_tensor_key=txt_k,
joint_tensor_value=txt_v,
joint_strategy='front',
).transpose(1, 2)
hidden_states = hidden_states.transpose(1, 2).reshape(batch_size, -1, attn.heads * head_dim)
# linear proj
hidden_states = attn.to_out[0](hidden_states)
# dropout
hidden_states = attn.to_out[1](hidden_states)
encoder_hidden_states, hidden_states = hidden_states.split(
[text_seq_length, hidden_states.size(1) - text_seq_length], dim=1
)
return hidden_states, encoder_hidden_states
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