hoelee/stable-diffusion-webui
1
0
Fork 0
mirror of https://github.com/AUTOMATIC1111/stable-diffusion-webui.git synced 2025-08-04 03:10:21 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

add --xformers-flash-attention option & impl

Browse Source
This commit is contained in:
Takuma Mori
2023-01-21 17:42:04 +09:00
parent 184e23eb89
commit 3262e825cc
2 changed files with 25 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
modules/sd_hijack_optimizations.py
View File

@@ -290,7 +290,19 @@ def xformers_attention_forward(self, x, context=None, mask=None):
q, k, v = map(lambda t: rearrange(t, 'b n (h d) -> b n h d', h=h), (q_in, k_in, v_in))
del q_in, k_in, v_in
out = xformers.ops.memory_efficient_attention(q, k, v, attn_bias=None)
if shared.cmd_opts.xformers_flash_attention:
op = xformers.ops.MemoryEfficientAttentionFlashAttentionOp
fw, bw = op
if not fw.supports(xformers.ops.fmha.Inputs(query=q, key=k, value=v, attn_bias=None)):
# print('xformers_attention_forward', q.shape, k.shape, v.shape)
# Flash Attention is not availabe for the input arguments.
# Fallback to default xFormers' backend.
op = None
else:
op = None
out = xformers.ops.memory_efficient_attention(q, k, v, attn_bias=None, op=op)
out = rearrange(out, 'b n h d -> b n (h d)', h=h)
return self.to_out(out)
@@ -365,7 +377,17 @@ def xformers_attnblock_forward(self, x):
q = q.contiguous()
k = k.contiguous()
v = v.contiguous()
out = xformers.ops.memory_efficient_attention(q, k, v)
if shared.cmd_opts.xformers_flash_attention:
op = xformers.ops.MemoryEfficientAttentionFlashAttentionOp
fw, bw = op
if not fw.supports(xformers.ops.fmha.Inputs(query=q, key=k, value=v)):
# print('xformers_attnblock_forward', q.shape, k.shape, v.shape)
# Flash Attention is not availabe for the input arguments.
# Fallback to default xFormers' backend.
op = None
else:
op = None
out = xformers.ops.memory_efficient_attention(q, k, v, op=op)
out = rearrange(out, 'b (h w) c -> b c h w', h=h)
out = self.proj_out(out)
return x + out