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Multi stage pipeline parallelism support #418

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Multi stage pipeline parallelism support #418

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@BlueCrescent BlueCrescent commented Nov 7, 2025

What does this PR do?

Adds support for multi stage pipeline parallelism schedules, in particular interleaved 1F1B.

General Changes

  • TBD

Breaking Changes

  • TBD

Checklist before submitting final PR

  • My PR is minimal and addresses one issue in isolation
  • I have merged the latest version of the target branch into this feature branch
  • I have reviewed my own code w.r.t. correct implementation, missing type hints, proper documentation, etc.
  • I have run a sample config for model training
  • I have checked that all tests run through (python tests/tests.py)
  • I have updated the internal changelog (CHANGELOG_DEV.md)

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@BlueCrescent