[scikit-learn] How to test on PYTHON_ARCH=32 with mac?

[lin yenchen]

Thanks for you guys' precious inputs.

I've successfully built a 32-bit python version scikit-learn and check it
by printing `sys.maxint`,
and all the tests passed on my mac. (I'm running the newest dev version
though)

Best,
Yen-Chen


2016-07-21 0:00 GMT+08:00 Matthew Brett <matthew.brett at gmail.com>:

> On Wed, Jul 20, 2016 at 9:16 AM, Matthew Brett <matthew.brett at gmail.com>
> wrote:
> > On Wed, Jul 20, 2016 at 9:09 AM, Olivier Grisel
> > <olivier.grisel at ensta.org> wrote:
> >>> I believe this `arch -i386`  only works as a prefix for Python.org
> Python, but I'm happy to be corrected.
> >>
> >> Then the following should work:
> >>
> >> arch -i386 python -c "import nose; nose.main()" sklearn
> >
> > Sorry - I should have been clear - this does work in selecting 32-bit
> > for the tests, using a nosetests installed into a Python.org Python
> > environment:
> >
> > arch -i386 nosetests sklearn
>
> Actually, I took the liberty of adding the OSX 32-bit tests to the
> wheel build tests, and scikit-learn 0.17.1 has one failure on 32-bit
> OSX:
>
> https://travis-ci.org/MacPython/scikit-learn-wheels/jobs/146127267#L11761
>
> ```
>
> ======================================================================
> ERROR: sklearn.tree.tests.test_tree.test_huge_allocations
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File
> "/Users/travis/build/MacPython/scikit-learn-wheels/venv/lib/python3.5/site-packages/nose/case.py",
> line 198, in runTest
>     self.test(*self.arg)
>   File
> "/Users/travis/build/MacPython/scikit-learn-wheels/venv/lib/python3.5/site-packages/sklearn/tree/tests/test_tree.py",
> line 1032, in test_huge_allocations
>     assert_raises(MemoryError, clf.fit, X, y)
>   File
> "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/unittest/case.py",
> line 727, in assertRaises
>     return context.handle('assertRaises', args, kwargs)
>   File
> "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/unittest/case.py",
> line 176, in handle
>     callable_obj(*args, **kwargs)
>   File
> "/Users/travis/build/MacPython/scikit-learn-wheels/venv/lib/python3.5/site-packages/sklearn/tree/tree.py",
> line 348, in fit
>     max_leaf_nodes)
>   File "sklearn/tree/_tree.pyx", line 291, in
> sklearn.tree._tree.BestFirstTreeBuilder.__cinit__
>
> (/private/var/folders/gw/_2jq29095y7b__wtby9dg_5h0000gn/T/pip-j_xtpbj9-build/sklearn/tree/_tree.c:4461)
> OverflowError: Python int too large to convert to C long
> ```
>
> No failures for 32-bit Linux though.
>
> Best,
>
> Matthew
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