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BUILDING.md

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Building from Source

This page describes how to build Core ML Tools (coremltools) from the source repository.

Requirements

To build coremltools from source, you need the following:

  • CMake
  • Miniconda (or Anaconda)
  • Zsh shell (the default shell for macOS 10.16+) installed in /usr/bin
  • A C++17 compatible compiler (if using GCC, need GCC 9.0 or later)

Build script

Follow these steps:

  1. Fork and clone the GitHub coremltools repository.

  2. Run the build.sh script to build coremltools.

    • By default this script uses Python 3.7, but you can include --python=3.8 (or 3.9, 3.10, 3.11) as a argument to change the Python version.
    • The script creates a new build folder with the coremltools distribution, and a dist folder with Python wheel files.

  3. Run the test.sh script to test the build.

Under the hood: If an Anaconda or Miniconda environment doesn't already exist or is not up-to-date, the build.sh script automatically runs the env_create.sh script to create the environment. It then uses env_activate.sh to activate the environment and set up the appropriate version of Python. The new environment is located at <repo root>/coremltoos/envs and is named after the py parameter. For example, a development environment with py 3.7 is named coremltools-dev-py37.

Build targets

The following build targets help you configure the development environment. If you need to add packages, edit the reqs/pip files, and the auto-environment script installs them automatically.

  • build | Build coremltools in debug mode (include symbols).
  • docs | Build documentation.
  • clean | Clean build dir.
  • clean_envs | Delete all envs created by the scripts.
  • lint | Linter.
  • proto | Build coremltools and rebuild MLModel protobuf sources.
  • release | Set up the package for release, but don't upload to pypi. Include all wheels from build/dist in the built package.
  • style | Style checking.
  • test | Run all tests. Pass TEST_PACKAGES="..." to set which packages to test.
  • test_fast | Run all fast tests.
  • test_slow | Run all non-fast tests.
  • wheel | Build wheels in release mode.

The script uses Python 3.7, but you can include --python=3.8 (or 3.9, 3.10, 3.11) as a argument to change the Python version.

Resources

For more information, see the following: