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Adds flash attention 2 support for FSDP2 ESM2 native#1519

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jomitchellnv wants to merge 3 commits intomainfrom
jm/fa2
Open

Adds flash attention 2 support for FSDP2 ESM2 native#1519
jomitchellnv wants to merge 3 commits intomainfrom
jm/fa2

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@jomitchellnv jomitchellnv commented Mar 14, 2026

Description

Enables FA2 support as default when not using TE

Usage

TODO: Add code snippet

Type of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Refactor
  • Documentation update
  • Other (please describe):

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Configure CI behavior by applying the relevant labels. By default, only basic unit tests are run.

  • ciflow:skip - Skip all CI tests for this PR
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For more details, see CONTRIBUTING

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Pre-submit Checklist

  • I have tested these changes locally
  • I have updated the documentation accordingly
  • I have added/updated tests as needed
  • All existing tests pass successfully

Signed-off-by: Jonathan Mitchell <jomitchell@nvidia.com>
Signed-off-by: Jonathan Mitchell <jomitchell@nvidia.com>
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Signed-off-by: Jonathan Mitchell <jomitchell@nvidia.com>
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coderabbitai bot commented Mar 14, 2026

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)
else:
mp_policy = MixedPrecisionPolicy()
mp_policy = MixedPrecisionPolicy(param_dtype=torch.bfloat16)
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Why?

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FA2 requires BF16 so i added it here.

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