diff options
Diffstat (limited to 'modules/sd_hijack_optimizations.py')
| -rw-r--r-- | modules/sd_hijack_optimizations.py | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/modules/sd_hijack_optimizations.py b/modules/sd_hijack_optimizations.py index 4fa54329..9967359b 100644 --- a/modules/sd_hijack_optimizations.py +++ b/modules/sd_hijack_optimizations.py @@ -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
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