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FA3 Failed to initialize the TMA descriptor #1343

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li-yi-dong opened this issue Nov 20, 2024 · 0 comments
Open

FA3 Failed to initialize the TMA descriptor #1343

li-yi-dong opened this issue Nov 20, 2024 · 0 comments

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@li-yi-dong
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Current implementation of FA3 would fail with zero length of K/V. It seems that zero length tensor has no valid data_ptr, and make_tma_copy(https://github.com/Dao-AILab/flash-attention/blob/main/hopper/mainloop_bwd_sm90_tma_gmma_ws.hpp#L333) would fail in backward.
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