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TE 1.4 fused attn caused a NaN when backward #1101

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Jack47 opened this issue Aug 13, 2024 · 1 comment
Open

TE 1.4 fused attn caused a NaN when backward #1101

Jack47 opened this issue Aug 13, 2024 · 1 comment

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@Jack47
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Jack47 commented Aug 13, 2024 •
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I met an nan using TE 1.4, after I use pytorch autograd.detect_anomaly, it captured the NaN traceback:

Error detected in FusedAttnFuncBackward.
...
[rank5]: RuntimeError: Function 'FusedAttnFuncBackward' returned nan values in its 2th output.

When I install TE 1.7, the nan disappeared.
@ksivaman
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@cyanguwa Was there any bug fix in fused attention backend's backward between these 2 releases that could explain this?

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@Jack47 @ksivaman