* Revert "Add scikit-learn as dependency for doc build (#3677)" This reverts commit308f664ade. * Revert "Add scikit-learn tests (#3674)" This reverts commitd176a0fbc8.
The documentation of xgboost is generated with recommonmark and sphinx. You can build it locally by typing "make html" in this folder. Checkout https://recommonmark.readthedocs.org for guide on how to write markdown with extensions used in this doc, such as math formulas and table of content.