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Fix flash_attn_bench crash on the flash_attn.cute (FA4) backend: pass window_size=(-1, -1) instead of None - #397

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Fix flash_attn_bench crash on the flash_attn.cute (FA4) backend: pass window_size=(-1, -1) instead of None#397
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Update flash_attn_bench.py to support FA4 OSS

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Meta CodeSync / Import Status Started 2026-06-19 13:02:55 ago

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