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When flash-attn >2.6.1, use context parallel will cause error #1467

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south-ocean opened this issue Feb 9, 2025 · 1 comment
Open

When flash-attn >2.6.1, use context parallel will cause error #1467

south-ocean opened this issue Feb 9, 2025 · 1 comment
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@cyanguwa

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@south-ocean
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In llama3, when i open the --context-parallel-size, TE will report error:

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IN te, softmax_lse_per_step and softmax_lse come from _flash_attn_forward, But when fa>2.6, the softmax_lse_per_step_resize from 3 dimension to 2 dimension, So te can not through this api，Do te support context parallel with fa>2.6 ?

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@ptrendx
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ptrendx commented Feb 14, 2025

@cyanguwa could you take a look?

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@ptrendx @cyanguwa @south-ocean