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920fd91 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | import torch
from typing import Optional
from einops import rearrange
from xfuser.core.distributed import (get_sequence_parallel_rank,
get_sequence_parallel_world_size,
get_sp_group)
from xfuser.core.long_ctx_attention import xFuserLongContextAttention
def initialize_usp():
import torch.distributed as dist
from xfuser.core.distributed import initialize_model_parallel, init_distributed_environment
dist.init_process_group(backend="nccl", init_method="env://")
init_distributed_environment(rank=dist.get_rank(), world_size=dist.get_world_size())
initialize_model_parallel(
sequence_parallel_degree=dist.get_world_size(),
ring_degree=1,
ulysses_degree=dist.get_world_size(),
)
torch.cuda.set_device(dist.get_rank())
def sinusoidal_embedding_1d(dim, position):
sinusoid = torch.outer(position.type(torch.float64), torch.pow(
10000, -torch.arange(dim//2, dtype=torch.float64, device=position.device).div(dim//2)))
x = torch.cat([torch.cos(sinusoid), torch.sin(sinusoid)], dim=1)
return x.to(position.dtype)
def pad_freqs(original_tensor, target_len):
seq_len, s1, s2 = original_tensor.shape
pad_size = target_len - seq_len
padding_tensor = torch.ones(
pad_size,
s1,
s2,
dtype=original_tensor.dtype,
device=original_tensor.device)
padded_tensor = torch.cat([original_tensor, padding_tensor], dim=0)
return padded_tensor
def rope_apply(x, freqs, num_heads):
x = rearrange(x, "b s (n d) -> b s n d", n=num_heads)
s_per_rank = x.shape[1]
x_out = torch.view_as_complex(x.to(torch.float64).reshape(
x.shape[0], x.shape[1], x.shape[2], -1, 2))
sp_size = get_sequence_parallel_world_size()
sp_rank = get_sequence_parallel_rank()
freqs = pad_freqs(freqs, s_per_rank * sp_size)
freqs_rank = freqs[(sp_rank * s_per_rank):((sp_rank + 1) * s_per_rank), :, :]
x_out = torch.view_as_real(x_out * freqs_rank).flatten(2)
return x_out.to(x.dtype)
def usp_dit_forward(self,
x: torch.Tensor,
timestep: torch.Tensor,
context: torch.Tensor,
clip_feature: Optional[torch.Tensor] = None,
y: Optional[torch.Tensor] = None,
use_gradient_checkpointing: bool = False,
use_gradient_checkpointing_offload: bool = False,
**kwargs,
):
t = self.time_embedding(
sinusoidal_embedding_1d(self.freq_dim, timestep))
t_mod = self.time_projection(t).unflatten(1, (6, self.dim))
context = self.text_embedding(context)
if self.has_image_input:
x = torch.cat([x, y], dim=1) # (b, c_x + c_y, f, h, w)
clip_embdding = self.img_emb(clip_feature)
context = torch.cat([clip_embdding, context], dim=1)
x, (f, h, w) = self.patchify(x)
freqs = torch.cat([
self.freqs[0][:f].view(f, 1, 1, -1).expand(f, h, w, -1),
self.freqs[1][:h].view(1, h, 1, -1).expand(f, h, w, -1),
self.freqs[2][:w].view(1, 1, w, -1).expand(f, h, w, -1)
], dim=-1).reshape(f * h * w, 1, -1).to(x.device)
def create_custom_forward(module):
def custom_forward(*inputs):
return module(*inputs)
return custom_forward
# Context Parallel
chunks = torch.chunk(x, get_sequence_parallel_world_size(), dim=1)
pad_shape = chunks[0].shape[1] - chunks[-1].shape[1]
chunks = [torch.nn.functional.pad(chunk, (0, 0, 0, chunks[0].shape[1]-chunk.shape[1]), value=0) for chunk in chunks]
x = chunks[get_sequence_parallel_rank()]
for block in self.blocks:
if self.training and use_gradient_checkpointing:
if use_gradient_checkpointing_offload:
with torch.autograd.graph.save_on_cpu():
x = torch.utils.checkpoint.checkpoint(
create_custom_forward(block),
x, context, t_mod, freqs,
use_reentrant=False,
)
else:
x = torch.utils.checkpoint.checkpoint(
create_custom_forward(block),
x, context, t_mod, freqs,
use_reentrant=False,
)
else:
x = block(x, context, t_mod, freqs)
x = self.head(x, t)
# Context Parallel
x = get_sp_group().all_gather(x, dim=1)
x = x[:, :-pad_shape] if pad_shape > 0 else x
# unpatchify
x = self.unpatchify(x, (f, h, w))
return x
def usp_attn_forward(self, x, freqs):
q = self.norm_q(self.q(x))
k = self.norm_k(self.k(x))
v = self.v(x)
q = rope_apply(q, freqs, self.num_heads)
k = rope_apply(k, freqs, self.num_heads)
q = rearrange(q, "b s (n d) -> b s n d", n=self.num_heads)
k = rearrange(k, "b s (n d) -> b s n d", n=self.num_heads)
v = rearrange(v, "b s (n d) -> b s n d", n=self.num_heads)
x = xFuserLongContextAttention()(
None,
query=q,
key=k,
value=v,
)
x = x.flatten(2)
del q, k, v
torch.cuda.empty_cache()
return self.o(x) |