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Fix import error when flash attention 3 is installed #1913

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Description

Referring to https://github.com/Dao-AILab/flash-attention/blob/7661781d001e0900121c000a0aaf21b3f94337d6/README.md?plain=1#L61-L62

flash_attn_interface shouldn't be imported from flash_attn_3 but instead directly, otherwise, the import error will happen.

Type of change

  • Documentation change (change only to the documentation, either a fix or a new content)
  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Infra/Build change
  • Code refactoring

Changes

Please list the changes introduced in this PR:

  • Remove flash_attn_3. when importing the flash attention 3's flash_attn_interface

Checklist:

  • I have read and followed the contributing guidelines
  • The functionality is complete
  • I have commented my code, particularly in hard-to-understand areas
  • I have made corresponding changes to the documentation
  • My changes generate no new warnings
  • I have added tests that prove my fix is effective or that my feature works
  • New and existing unit tests pass locally with my changes

Referring to https://github.com/Dao-AILab/flash-attention/blob/7661781d001e0900121c000a0aaf21b3f94337d6/README.md?plain=1#L61-L62

`flash_attn_interface` shouldn't be imported from flash_attn_3 but
instead directly, otherwise, the import error will happen.

Signed-off-by: Hollow Man <hollowman@opensuse.org>
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