brew install numpy
brew install scipy
brew install matplotlib
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*VirtualEnv*
$ mkvirtualenv ml
$ cd .virtualenvs/ml/
$ ln -s /usr/local/lib/python2.7/site-packages/{numpy,scipy}* lib/python2.7/site-packages/
$ workon ml
(ml) $ pip freeze | grep -i numpy
(ml) $ pip install scikit-learn
(ml) $ pip install tensorflow
…
…
(ml) $ pip freeze | grep -i numpy
(ml) $ deactivate (when done)