LightGBM/docs/README.rst

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Documentation
=============
Documentation for LightGBM is generated using `Sphinx <https://www.sphinx-doc.org/>`__
and `Breathe <https://breathe.readthedocs.io/>`__, which works on top of `Doxygen <https://www.doxygen.nl/index.html>`__ output.
List of parameters and their descriptions in `Parameters.rst <./Parameters.rst>`__
is generated automatically from comments in `config file <https://github.com/microsoft/LightGBM/blob/master/include/LightGBM/config.h>`__
by `this script <https://github.com/microsoft/LightGBM/blob/master/.ci/parameter-generator.py>`__.
After each commit on ``master``, documentation is updated and published to `Read the Docs <https://lightgbm.readthedocs.io/>`__.
Build
-----
It is not necessary to re-build this documentation while modifying LightGBM's source code.
The HTML files generated using ``Sphinx`` are not checked into source control.
However, you may want to build them locally during development to test changes.
Docker
^^^^^^
The most reliable way to build the documentation locally is with Docker, using `the same images Read the Docs uses <https://hub.docker.com/r/readthedocs/build>`_.
Run the following from the root of this repository to pull the relevant image and run a container locally.
.. code:: sh
docker run \
--rm \
--user=0 \
-v $(pwd):/opt/LightGBM \
--env C_API=true \
--env CONDA=/opt/miniforge \
--env READTHEDOCS=true \
--workdir=/opt/LightGBM/docs \
--entrypoint="" \
readthedocs/build:ubuntu-20.04-2021.09.23 \
/bin/bash build-docs.sh
When that code completes, open ``docs/_build/html/index.html`` in your browser.
.. note::
The navigation in these locally-built docs does not link to the local copy of the R documentation. To view the local version of the R docs, open ``docs/_build/html/R/index.html`` in your browser.
Without Docker
^^^^^^^^^^^^^^
You can build the documentation locally without Docker. Just install Doxygen and run in ``docs`` folder
.. code:: sh
pip install breathe sphinx 'sphinx_rtd_theme>=0.5'
make html
Note that this will not build the R documentation.
Consider using common R utilities for documentation generation, if you need it.
Or use the Docker-based approach described above to build the R documentation locally.
Optionally, you may also install ``scikit-learn`` and get richer documentation for the classes in ``Scikit-learn API``.
If you faced any problems with Doxygen installation or you simply do not need documentation for C code, it is possible to build the documentation without it:
.. code:: sh
pip install sphinx 'sphinx_rtd_theme>=0.5'
export C_API=NO || set C_API=NO
make html