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Governance

LitData is an open source project backed by Lightning AI, released under the Apache-2.0 license.

Roles and responsibilities

Maintainers review and merge contributions, triage issues, guide technical direction, and cut releases. The current maintainers are listed under Maintainers in the README; ownership is scoped by path in .github/CODEOWNERS.

Contributors are anyone contributing code, tests, docs, triage, or review. See CONTRIBUTING.md to get started.

Emeritus maintainers are past maintainers, recorded under Emeritus Maintainers and not requested for review.

Maintainers are invited on the strength of sustained contribution, with the agreement of the current maintainers. A maintainer may step down, or be moved to emeritus status after a long period of inactivity, by a pull request updating the README roster and .github/CODEOWNERS.

Decision making

Changes land through pull requests against main; direct pushes are not used. A pull request needs passing CI and approval from a maintainer who owns the affected paths. Larger changes — new public APIs, breaking changes, new dependencies, changes to the on-disk chunk format or index schema — should start as an issue. Maintainers work by consensus and resolve disagreements in the open.

Communication

GitHub issues and pull requests are the source of truth for decisions. Discussion also happens on Discord, but anything affecting the project is recorded on GitHub.

Releases

LitData follows MAJOR.MINOR.PATCH versioning, with the version in src/litdata/__about__.py.

  • Cadence: cut as needed rather than on a fixed calendar, once a meaningful set of fixes or features has landed on main. Regressions and security fixes ship as soon as they are ready.
  • Criteria: main is green across the CI matrix, including tests, typing, packaging, documentation, simulator, and benchmark checks.
  • Process: a maintainer bumps the version and publishes a GitHub Release, which builds and publishes the distributions to PyPI via trusted publishing.
  • Supported versions: supported Python and dependency ranges are documented in the project configuration and tested in CI. LitData is validated against the latest two PyTorch minor releases; support for a PyTorch or Python version is dropped only in a minor release and announced in the release notes.

Code of Conduct

All participants follow the Code of Conduct. Reports go to community@lightning.ai.

Changing this document

By pull request, with approval from at least two maintainers.