[Numpy-discussion] Failed numpy.test() with numpy-1.10.1 on RHEL 6

[Eric Moore]

This fails because numpy uses the function `cacosh` from the libm and on
RHEL6 this function has a bug.  As long as you don't care about getting the
sign right at the branch cut in this function, then it's harmless.  If you
do care, the easiest solution will be to install something like anaconda
that does not link against the relatively old libm that RHEL6 ships.

On Mon, Nov 9, 2015 at 1:11 AM, Lintula <bugreports2005 at cs.tut.fi> wrote:

> Hello,
>
> I'm setting up numpy 1.10.1 on RHEL6 (python 2.6.6, atlas-3.8.4,
> lapack-3.2.1, gcc-4.4.7), and this test fails for me. I notice that
> someone else has had the same at
> https://github.com/numpy/numpy/issues/6063 in July.
>
> Is this harmless or is it of concern?
>
>
> ======================================================================
> FAIL: test_umath.TestComplexFunctions.test_branch_cuts(<ufunc
> 'arccosh'>, [-1, 0.5], [1j, 1j], 1, -1, True)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File "/usr/lib/python2.6/site-packages/nose/case.py", line 182, in
> runTest
>     self.test(*self.arg)
>   File
> "/usr/lib64/python2.6/site-packages/numpy/core/tests/test_umath.py",
> line 1748, in _check_branch_cut
>     assert_(np.all(np.absolute(y0.imag - yp.imag) < atol), (y0, yp))
>   File "/usr/lib64/python2.6/site-packages/numpy/testing/utils.py", line
> 53, in assert_
>     raise AssertionError(smsg)
> AssertionError: (array([  0.00000000e+00+3.14159265j,
> 1.11022302e-16-1.04719755j]), array([  4.71216091e-07+3.14159218j,
> 1.28119737e-13+1.04719755j]))
>
> ----------------------------------------------------------------------
> Ran 5955 tests in 64.284s
>
> FAILED (KNOWNFAIL=3, SKIP=2, failures=1)
> <nose.result.TextTestResult run=5955 errors=0 failures=1>
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