[SciPy-user] test fails in 0.7rc2

Gideon Simpson simpson@math.toronto....
Mon Jan 26 15:57:11 CST 2009


I'm running ATLAS 3.8.2 with lapack 3.1.1 built on gcc 4.3.2.  ATLAS  
and lapack are built with the compiler flags:

-fomit-frame-pointer -mfpmath=387 -O2 -falign-loops=4 -fPIC -m64


-gideon

On Jan 26, 2009, at 4:53 PM, Robert Kern wrote:

> On Mon, Jan 26, 2009 at 15:44, Gideon Simpson <simpson@math.toronto.edu 
> > wrote:
>> Not sure how serious this is, but:
>>
>> = 
>> =====================================================================
>> FAIL: test_x_stride (test_fblas.TestCgemv)
>> ----------------------------------------------------------------------
>> Traceback (most recent call last):
>>  File "/usr/local/nonsystem/simpson/lib/python2.5/site-packages/
>> scipy/lib/blas/tests/test_fblas.py", line 345, in test_x_stride
>>    assert_array_almost_equal(desired_y,y)
>>  File "/usr/local/nonsystem/simpson/lib/python2.5/site-packages/
>> numpy/testing/utils.py", line 311, in assert_array_almost_equal
>>    header='Arrays are not almost equal')
>>  File "/usr/local/nonsystem/simpson/lib/python2.5/site-packages/
>> numpy/testing/utils.py", line 296, in assert_array_compare
>>    raise AssertionError(msg)
>> AssertionError:
>> Arrays are not almost equal
>>
>> (mismatch 33.3333333333%)
>> x: array([  7.42531872 -7.42531872j,   4.58355808 -2.58355808j,
>>       -12.38274670+16.38274765j], dtype=complex64)
>> y: array([  7.42531872 -7.42531872j,   4.58355808 -2.58355808j,
>>       -12.38274670+16.38274574j], dtype=complex64)
>
> Doesn't look particularly serious. Possibly your ATLAS is using
> aggressive speed optimization at the cost of a couple of decimal
> points of precision. What platform are you on? What BLAS are you
> using?
>
> -- 
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless
> enigma that is made terrible by our own mad attempt to interpret it as
> though it had an underlying truth."
>  -- Umberto Eco
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