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CONTRIBUTING.md

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Interested in contributing to MMLSpark? We're excited to work with you.

You can contribute in many ways:

  • Use the library and give feedback: report bugs, request features.
  • Add sample Jupyter notebooks, Python or Scala code examples, documentation pages.
  • Fix bugs and issues.
  • Add new features, such as data transformations or machine learning algorithms.
  • Review pull requests from other contributors.

How to contribute?

You can give feedback, report bugs and request new features anytime by opening an issue. Also, you can up-vote or comment on existing issues.

If you want to add code, examples or documentation to the repository, follow this process:

Propose a contribution

  • Preferably, get started by tackling existing issues to get yourself acquainted with the library source and the process.
  • Open an issue, or comment on an existing issue to discuss your contribution and design, to ensure your contribution is a good fit and doesn't duplicate on-going work.
  • Any algorithm you're planning to contribute should be well known and accepted for production use, and backed by research papers.
  • Algorithms should be highly scalable and suitable for very large datasets.
  • All contributions need to comply with the MIT License. Contributors external to Microsoft need to sign CLA.

Implement your contribution

  • Fork the MMLSpark repository.
  • Implement your algorithm in Scala, using our wrapper generation mechanism to produce PySpark bindings.
  • Use SparkML PipelineStages so your algorithm can be used as a part of pipeline.
  • For parameters use MMLParams.
  • Implement model saving and loading by extending SparkML MLReadable.
  • Use good Scala style.
  • Binary dependencies should be on Maven Central.
  • See this pull request for an example contribution.

Implement tests

  • Set up build environment. Use a Linux machine or VM (we use Ubuntu, but other distros should work too), and install environment using the runme script.
  • Test your code locally.
  • Add tests using ScalaTests — unit tests are required.
  • A sample notebook is required as an end-to-end test.

Implement documentation

  • Add a sample Jupyter notebook that shows the intended use case of your algorithm, with instructions in step-by-step manner. (The same notebook could be used for testing the code.)
  • Add in-line ScalaDoc comments to your source code, to generate the API reference documentation

Open a pull request

  • In most cases, you should squash your commits into one.
  • Open a pull request, and link it to the discussion issue you created earlier.
  • An MMLSpark core team member will trigger a build to test your changes.
  • Fix any build failures. (The pull request will have comments from the build with useful links.)
  • Wait for code reviews from core team members and others.
  • Fix issues found in code review and re-iterate.

Build and check-in

  • Wait for a core team member to merge your code in.
  • Your feature will be available through a Docker image and script installation in the next release, which typically happens around once a month. You can try out your features sooner by using build artifacts for the version that has your changes merged in (such versions end with a .devN).

If in doubt about how to do something, see how it was done in existing code or pull requests, and don't hesitate to ask.