[SciPy-Dev] ANN: SciPy 0.9.0 beta 1

Charles R Harris charlesr.harris@gmail....
Tue Dec 14 14:09:11 CST 2010


On Tue, Dec 14, 2010 at 10:52 AM, Bruce Southey <bsouthey@gmail.com> wrote:

> On Tue, Dec 14, 2010 at 10:13 AM, Ralf Gommers
> <ralf.gommers@googlemail.com> wrote:
> >
> >
> > On Wed, Dec 15, 2010 at 12:01 AM, Benjamin Root <ben.root@ou.edu> wrote:
> >>
> >>
> >> On Tue, Dec 14, 2010 at 6:38 AM, Ralf Gommers
> >> <ralf.gommers@googlemail.com> wrote:
> >>>
> >>>
> >>> On Tue, Dec 14, 2010 at 12:43 AM, Benjamin Root <ben.root@ou.edu>
> wrote:
> >>>
> >>> Hi Ben,
> >>>>
> >>>> Just did a clean rebuild (after a clean rebuild of numpy) and had two
> >>>> errors in the tests:
> >>>
> >>> What platform are you on?
> >>
> >> I reran the tests on just this scipy.misc module, here is the output:
> >>
> >> >>> scipy.misc.test()
> >> Running unit tests for scipy.misc
> >> NumPy version 2.0.0.dev-799179d
> >> NumPy is installed in /home/bvr/Programs/numpy/numpy
> >> SciPy version 0.10.0.dev
> >> SciPy is installed in /home/bvr/Programs/scipy/scipy
> >> Python version 2.6.4 (r264:75706, Jun  4 2010, 18:20:16) [GCC 4.4.4
> >> 20100503 (Red Hat 4.4.4-2)]
> >> nose version 0.11.3
> >> ...........F.....
> >> ======================================================================
> >> FAIL: test_imresize (test_pilutil.TestPILUtil)
> >> ----------------------------------------------------------------------
> >> Traceback (most recent call last):
> >>   File "/home/bvr/Programs/numpy/numpy/testing/decorators.py", line 146,
> >> in skipper_func
> >>     return f(*args, **kwargs)
> >>   File "/home/bvr/Programs/scipy/scipy/misc/tests/test_pilutil.py", line
> >> 28, in test_imresize
> >>     assert_equal(im1.shape,(11,22))
> >>   File "/home/bvr/Programs/numpy/numpy/testing/utils.py", line 251, in
> >> assert_equal
> >>     assert_equal(actual[k], desired[k], 'item=%r\n%s' % (k,err_msg),
> >> verbose)
> >>   File "/home/bvr/Programs/numpy/numpy/testing/utils.py", line 313, in
> >> assert_equal
> >>     raise AssertionError(msg)
> >> AssertionError:
> >> Items are not equal:
> >> item=0
> >>
> >>  ACTUAL: 10
> >>  DESIRED: 11
> >>
> >> ----------------------------------------------------------------------
> >> Ran 17 tests in 0.089s
> >>
> >> FAILED (failures=1)
> >> <nose.result.TextTestResult run=17 errors=0 failures=1>
> >>
> >> Note, that I am still getting this error with the suggested addition of
> >> "np.random.seed(12345678)" to scipy/misc/tests/test_pilutil.py.  I tried
> it
> >> both at line 20 (before the call to class TestPILUtil) and at line 24
> >> (before the call to np.random.random() in test_imresize.  I do not see
> how
> >> setting the seed value for these tests would make any difference since
> they
> >> are merely testing the resulting shape of the image after a resize, not
> the
> >> values of the resized image itself.
> >
> > The seeding may not matter (I haven't actually looked in detail yet), but
> I
> > thought I had seen this error pop up before, but not reproducibly. The
> > imresize function does some interpolation, so the numerical values could
> > matter. In that case seeding would help.
> >>
> >>
> >>>>
> >>>> ======================================================================
> >>>> FAIL: test_imresize (test_pilutil.TestPILUtil)
> >>>> ----------------------------------------------------------------------
> >>>> Traceback (most recent call last):
> >>>>   File "/home/bvr/Programs/numpy/numpy/testing/decorators.py", line
> 146,
> >>>> in skipper_func
> >>>>     return f(*args, **kwargs)
> >>>>   File "/home/bvr/Programs/scipy/scipy/misc/tests/test_pilutil.py",
> line
> >>>> 25, in test_imresize
> >>>>     assert_equal(im1.shape,(11,22))
> >>>>   File "/home/bvr/Programs/numpy/numpy/testing/utils.py", line 251, in
> >>>> assert_equal
> >>>>     assert_equal(actual[k], desired[k], 'item=%r\n%s' % (k,err_msg),
> >>>> verbose)
> >>>>   File "/home/bvr/Programs/numpy/numpy/testing/utils.py", line 313, in
> >>>> assert_equal
> >>>>     raise AssertionError(msg)
> >>>> AssertionError:
> >>>> Items are not equal:
> >>>> item=0
> >>>>
> >>>>  ACTUAL: 10
> >>>>  DESIRED: 11
> >>>
> >>> This test should be changed to use a fixed seed (add as a first line of
> >>> the test "np.random.seed(12345678)"). Can you provide one that fails?
> >>>
> >>
> >> Also, I am not sure what you mean by "Can you provide one that fails?".
> >
> > I meant a seed value that fails. This one does, that's all we need.
>
> On my 64-bit linux system with Python 2.7, the error appears comes
> from float16 dtype rather than the actual seed
> >>> np.random.seed(12345678)
> >>> for T in np.sctypes['float'] + [float]:
> ...     im1 = pilutil.imresize(im,T(1.1))
> ...     print T, im.shape, im1.shape
> ...
> <type 'numpy.float16'> (10, 20) (10, 21)
> <type 'numpy.float32'> (10, 20) (11, 22)
> <type 'numpy.float64'> (10, 20) (11, 22)
> <type 'numpy.float128'> (10, 20) (11, 22)
> <type 'float'> (10, 20) (11, 22)
>
> Here only the float16 has different shape from the rest.
>
>
Ah, you compiled against numpy master instead of numpy 1.5.1, float16 is
only in the development branch. I think the test should be fixed to use an
explicit list of types supported by pilutil.

Chuck
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