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Merge pull request #89 from Stability-AI/dango.patch.atten_overflow

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* Force cast to fp32 to avoid atten layer overflow
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Robin Rombach 2022-12-07 14:54:35 +01:00 committed by GitHub
commit 8bde0cf64f
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1 changed files with 12 additions and 2 deletions
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14
ldm/modules/attention.py
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@ -16,6 +16,9 @@ try:
except:
XFORMERS_IS_AVAILBLE = False
# CrossAttn precision handling
import os
_ATTN_PRECISION = os.environ.get("ATTN_PRECISION", "fp32")
def exists(val):
return val is not None
@ -167,9 +170,16 @@ class CrossAttention(nn.Module):
q, k, v = map(lambda t: rearrange(t, 'b n (h d) -> (b h) n d', h=h), (q, k, v))
sim = einsum('b i d, b j d -> b i j', q, k) * self.scale
# force cast to fp32 to avoid overflowing
if _ATTN_PRECISION =="fp32":
with torch.autocast(enabled=False, device_type = 'cuda'):
q, k = q.float(), k.float()
sim = einsum('b i d, b j d -> b i j', q, k) * self.scale
else:
sim = einsum('b i d, b j d -> b i j', q, k) * self.scale
del q, k
if exists(mask):
mask = rearrange(mask, 'b ... -> b (...)')
max_neg_value = -torch.finfo(sim.dtype).max