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Installing scikit-learn on Mac OS X (including gfortran and scipy)
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scikit-learn-mac-install.md

I had some problems with installing scikit-learn on Mac OS X. I believe that the main problem was at step of installing gfortran (required to install scipy, which is required to install scikit-learn).

I was as of Oct 2012; plus it might have depended on some of my custom settings/configurations.

My starting point:

-5. MacOSX 10.8.1 (Mountain Lion)

-4. XCode 4.5 installed with Command line tools

-3. Homebrew installed http://mxcl.github.com/homebrew/ (thx Kevin for recommending it!)

-2. custom Python 2.6 in /Library/Frameworks/Python.framework/Versions/2.6/bin/python

-1. NumPy and MathPlotLib already there

Steps:

  1. install gfortran with homebrew:

$ brew install gfortran

  1. install SciPy from http://sourceforge.net/projects/scipy/files/ (file scipy-0.11.0-py2.6-python.org-macosx10.3.dmg)

  2. (AFAIR) install sklearn with:

$ sudo env ARCHFLAGS="-arch i386" pip install scikit-learn

Warning/disclaimer:

  • check, but I cannot promise that it is going to work; I did many steps (in vain) in between, and some actually might have influenced the install

  • http://fonnesbeck.github.com/ScipySuperpack/ looks extremely promsing (thx Fariba), and it claimed that it installed succesfully... but it does not work (at least - for me)

  • don't even try installing SciPy with pip or easy_install; you are going to run in almost-baked installs, with some contradictions with respect to architectures (i386 vs x86_64) - it will be installed, but some functions are going to crash, as well as sklearn (vide http://stackoverflow.com/questions/2155986/mac-10-6-universal-binary-scipy-cephes-specfun-aswfa-symbol-not-found)

  • main place for gfortran is down http://r.research.att.com/tools/ (at least, as of now, they claim "NOTE: some links may be broken - we are working on the issue and most of them should be back by the end of Monday (10/15), possibly earlier.")

Looking forward for your feedback!

@tianqig
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tianqig commented Oct 12, 2013

I tried to follow your steps to install scikit-learn, got into problem at step 1, here are the message:

brew install gfortran
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/gfortran-4.8.1.mountain_lion.bottle.tar.gz

curl: (56) Recv failure: Connection reset by peer
Warning: Bottle installation failed: building from source.
==> Downloading http://ftpmirror.gnu.org/gcc/gcc-4.8.1/gcc-4.8.1.tar.bz2
Already downloaded: /Library/Caches/Homebrew/gfortran-4.8.1.tar.bz2
==> ../configure --prefix=/usr/local/Cellar/gfortran/4.8.1/gfortran --datarootdir=/usr/local/Cellar/gfortran/4.8.1/share --bindir=/usr/local/Cellar/gfortran/4.8.1/bin --enable-languages=fortran --with-system-
==> make bootstrap

then nothing happened after near 1 hour, not sure if my computer was still in executing the command.

Any suggestions? Thanks

Tian

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