Check for attention mask in backends that don't support it #12892
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This was referenced Dec 26, 2025
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What does this PR do?
Using an attention backend (https://huggingface.co/docs/diffusers/main/optimization/attention_backends) with a model that passes attention masks yields incorrect results.
This is already checked in parallel backends...
diffusers/src/diffusers/models/attention_dispatch.py
Line 978 in f6b6a71
...but not yet in the regular ones.
This PR changes that.
Fixes #12605
Who can review?
@yiyixuxu and @asomoza
CC @zzlol63 @tolgacangoz