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[MRG] numpy dependency in setup.py #292
Merged
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Add numpy to setup's extras_require to make explicit dependency optional:
Useful for a requirements.txt file with root_numpy[with-numpy]. Exactly how scikit-learn implements optional explicit dependency on numpy in setup.py: http://scikit-learn.org/stable/install.html
Put numpy in setup's setup_requires and install_requires lists only if not already installed.
Prevents pip from upgrading an existing numpy installation.
This is what scipy does.