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chore: prepare changelog for 2.6.4 release#21729

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justusschock merged 1 commit into
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bhimrazy:chore/prepare-changelog-for-2.6.4
May 20, 2026
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chore: prepare changelog for 2.6.4 release#21729
justusschock merged 1 commit into
Lightning-AI:masterfrom
bhimrazy:chore/prepare-changelog-for-2.6.4

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@bhimrazy bhimrazy commented May 20, 2026 •
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What does this PR do?

Prepares the changelog for the 2.6.4 release.

  • Adds [2.6.4] - 2026-05-20 section to both PyTorch Lightning and Fabric changelogs
  • Adds a note citing the supply chain security compromise as the reason for the version skip
  • Adds the previously undocumented SimpleProfiler math.fsum precision fix (#21525)
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  • Did you write any new necessary tests? (not for typos and docs)
  • Did you verify new and existing tests pass locally with your changes?
  • Did you list all the breaking changes introduced by this pull request?
  • Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

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@bhimrazy
chore: prepare changelog for 2.6.4 release
3b0534a 
- Add [2.6.4] release section with all changes from the skipped 2.6.2/2.6.3
- Note supply chain security compromise (see Lightning-AI#21691) as reason for skipped versions
- Includes: Neptune logger removal, LitLogger bump, val_check_interval fix,
  pkg-resources fix, FSDP mixed precision fix, device_mesh type hint fix,
  RichModelSummary fix, SimpleProfiler math.fsum precision fix
@justusschock justusschock merged commit 513d859 into Lightning-AI:master May 20, 2026
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@bhimrazy bhimrazy deleted the chore/prepare-changelog-for-2.6.4 branch May 20, 2026 10:56
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@justusschock justusschock justusschock approved these changes

@tchaton tchaton Awaiting requested review from tchaton tchaton is a code owner

@ethanwharris ethanwharris Awaiting requested review from ethanwharris ethanwharris is a code owner

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@bhimrazy @justusschock