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Contributing guidelines

Introduction

Thank you for contributing to SHAP. SHAP is an open source collective effort, and contributions of all forms are welcome!

You can contribute by:

If you are looking for a good place to get started, look for issues with the good first issue label.

Writing helpful bug reports

When submitting bug reports on the issue tracker, it is very helpful for the maintainers to include a good Minimal Reproducible Example (MRE).

An MRE should be:

  • Minimal: Use as little code as possible that still produces the same problem.
  • Self-contained: Include everything needed to reproduce your problem, including imports and input data.
  • Reproducible: Test the code you're about to provide to make sure it reproduces the problem.

For more information, see How To Craft Minimal Bug Reports.

Installing the latest version

To get the very latest version of shap, you can pip-install the library directly from the master branch:

pip install git+https://github.com/shap/shap.git@master

This can be useful to test if a particular issue or bug has been fixed since the most recent release.

Alternatively, if you are considering making changes to the code you can clone the repository and install your local copy as described below.

Setting up a local development environment

Fork the repository

Click this link to fork the repository on GitHub to your user area.

Clone the repository to your local environment, using the URL provided by the green <> Code button on your projects home page.

Creating a python environment

Create a new isolated environment for the project, e.g. with conda:

conda create -n shap python=3.11
conda activate shap

Installing from source

Pip-install the project with the --editable flag, which ensures that any changes you make to the source code are immediately reflected in your environment.

pip install --editable '.[test,plots,docs]'

The various pip extras are defined in pyproject.toml:

  • test-core: a minimal set of dependencies to run pytest.
  • test: a wider set of 3rd party packages for the full test suite such as tensorflow, pytest, xgboost.
  • plots: includes matplotlib.
  • docs: dependencies for building the docs with Sphinx.

Note: When installing from source, shap will attempt to build the C extension and the CUDA extension. If CUDA is not available, shap will retry the build without CUDA support.

Consequently, is is quite normal to see warnings such as WARNING: Could not compile cuda extensions when building from source if you do not have CUDA available.

Code checks with precommit

We use pre-commit hooks to run code checks. Enable pre-commit in your local environment with:

pip install pre-commit
pre-commit install

To run the checks on all files, use:

pre-commit install
pre-commit run --all-files

Ruff is used as a linter, and it is enabled as a pre-commit hook. You can also run ruff locally with:

pip install ruff
ruff check .

Unit tests with pytest

The unit test suite can be run locally with:

pytest

Pull Requests (PRs)

Etiquette for creating PRs

Before starting on a PR, please make a proposal by opening an Issue, checking for any duplicates. This isn't necessary for trivial PRs such as fixing a typo.

Keep the scope small. This makes PRs a lot easier to review. Separate functional code changes (such as bug fixes) from refactoring changes (such as style improvements). PRs should contain one or the other, but not both.

Open a Draft PR as early as possible, do not wait until the feature is ready. Work on a feature branch with a descriptive name such as fix/lightgbm-warnings or doc/contributing.

Use a descriptive title, such as:

  • FIX: Update parameters to remove DeprecationWarning in TreeExplainer
  • ENH: Add support for python 3.11
  • DOCS: Fix formatting of ExactExplainer docstring

Checklist for publishing PRs

Before marking your PR as "ready for review" (by removing the Draft status), please ensure:

  • Your feature branch is up-to-date with the master branch,
  • All pre-commit hooks pass, and
  • Unit tests have been added (if your PR adds any new features or fixes a bug).

Documentation

The documentation is hosted at shap.readthedocs.io. If you have modified the docstrings or notebooks, please also check that the changes are are rendered properly in the generated HTML files.

Previewing changes on Pull Requests

The documentation is built automatically on each Pull Request, to facilitate previewing how your changes will render. To see the preview:

  1. Look for "All checks have passed", and click "Show all checks".
  2. Browse to the check called "docs/readthedocs.org".
  3. Click the Details hyperlink to open a preview of the docs.

The PR previews are typically hosted on a URL of the form below, replacing <pr-number>:

https://shap--<pr-number>.org.readthedocs.build/en/<pr-number>

Building the docs locally

To build the documentation locally:

  1. Navigate to the docs directory.
  2. Run make html.
  3. Open "_build/html/index.html" in your browser.

Note that nbsphinx currently requires the stand-alone program pandoc. If you get an error "Pandoc wasn't found", install that pandoc as described in nbsphinx installation guide.