macOSのソースコードはscikit-learnをインストールします。

官文ガイド:http://scikit-learn.org/stable/developers/advanced_installation.

$ wget -c https://github.com/scikit-learn/scikit-learn/archive/0.20.X.zip #    scikit-learn 0.20.x   
$ wget -c https://files.pythonhosted.org/packages/0f/d7/136a447295adade38e7184618816e94190ded028318062a092daeb972073/scikit-learn-0.20.0.tar.gz # https://pypi.org/project/scikit-learn/#files
$ tar xzvf scikit-learn-0.20.0.tar.gz #     pypi.org           
$ unzip 0.20.X.zip #        
$ cd scikit-learn-0.20.X/
$ python3 -m venv sklearn0.20.x #    sklearn      
$ source sklearn0.20.x/bin/activate #       
(sklearn0.20.x) $ pip install numpy scipy cython pytest matplotlib #     
(sklearn0.20.x) $ pip install --editable . #    sklearn
(sklearn0.20.x) $ pytest sklearn