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add split attention layer optimization from https://github.com/basujindal/stable-diffusion/pull/117

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AUTOMATIC 2022-09-05 01:41:20 +03:00
parent 407fc1fe0c
commit 5bb126bd89
2 changed files with 44 additions and 1 deletions
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44
modules/sd_hijack.py
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@ -3,8 +3,43 @@ import sys
import traceback
import torch
import numpy as np
from torch import einsum
from modules.shared import opts, device
from modules.shared import opts, device, cmd_opts
from ldm.util import default
from einops import rearrange
import ldm.modules.attention
# see https://github.com/basujindal/stable-diffusion/pull/117 for discussion
def split_cross_attention_forward(self, x, context=None, mask=None):
h = self.heads
q = self.to_q(x)
context = default(context, x)
k = self.to_k(context)
v = self.to_v(context)
del context, x
q, k, v = map(lambda t: rearrange(t, 'b n (h d) -> (b h) n d', h=h), (q, k, v))
r1 = torch.zeros(q.shape[0], q.shape[1], v.shape[2], device=q.device)
for i in range(0, q.shape[0], 2):
end = i + 2
s1 = einsum('b i d, b j d -> b i j', q[i:end], k[i:end])
s1 *= self.scale
s2 = s1.softmax(dim=-1)
del s1
r1[i:end] = einsum('b i j, b j d -> b i d', s2, v[i:end])
del s2
r2 = rearrange(r1, '(b h) n d -> b n (h d)', h=h)
del r1
return self.to_out(r2)
class StableDiffusionModelHijack:
@ -67,6 +102,9 @@ class StableDiffusionModelHijack:
model_embeddings.token_embedding = EmbeddingsWithFixes(model_embeddings.token_embedding, self)
m.cond_stage_model = FrozenCLIPEmbedderWithCustomWords(m.cond_stage_model, self)
if cmd_opts.opt_split_attention:
ldm.modules.attention.CrossAttention.forward = split_cross_attention_forward
class FrozenCLIPEmbedderWithCustomWords(torch.nn.Module):
def __init__(self, wrapped, hijack):
@ -205,4 +243,8 @@ class EmbeddingsWithFixes(torch.nn.Module):
return inputs_embeds
model_hijack = StableDiffusionModelHijack()

1
modules/shared.py
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@ -29,6 +29,7 @@ parser.add_argument("--unload-gfpgan", action='store_true', help="unload GFPGAN
parser.add_argument("--precision", type=str, help="evaluate at this precision", choices=["full", "autocast"], default="autocast")
parser.add_argument("--share", action='store_true', help="use share=True for gradio and make the UI accessible through their site (doesn't work for me but you might have better luck)")
parser.add_argument("--esrgan-models-path", type=str, help="path to directory with ESRGAN models", default=os.path.join(script_path, 'ESRGAN'))
parser.add_argument("--opt-split-attention", type=str, help="enable optimization that reduced vram usage by a lot for about 10% decrease in performance", default=os.path.join(script_path, 'ESRGAN'))
cmd_opts = parser.parse_args()
cpu = torch.device("cpu")