BUG: test_sq_cases fails on powerpc64 #29918
Description
Describe the issue:
Running the test suite on a big-endian powerpc64 machine gives me a failure. Maybe similar to #14438, but removing OpenBLAS from the build environment still makes this test fail (albeit with different values).
Reproduce the code example:
# I don't have any NumPy code of my own, just reporting a failure in your own test suite.
# You prolly know better than me how to invoke that :)Error message:
Full error with OpenBLAS available:
FAILED lib/python3.13/site-packages/numpy/linalg/tests/test_linalg.py::TestDet::test_sq_cases - AssertionError: In test case: <LinalgCase: csingle>
Traceback (most recent call last):
File "/nix/store/g1337qaa5692wwgzlmpfzhmvqs41whis-python3.13-numpy-2.3.2/lib/python3.13/site-packages/numpy/linalg/tests/test_linalg.py", line 386, in check_cases
case.check(self.do)
~~~~~~~~~~^^^^^^^^^
File "/nix/store/g1337qaa5692wwgzlmpfzhmvqs41whis-python3.13-numpy-2.3.2/lib/python3.13/site-packages/numpy/linalg/tests/test_linalg.py", line 116, in check
do(self.a, self.b, tags=self.tags)
~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/nix/store/g1337qaa5692wwgzlmpfzhmvqs41whis-python3.13-numpy-2.3.2/lib/python3.13/site-packages/numpy/linalg/tests/test_linalg.py", line 924, in do
assert_almost_equal(np.abs(s[m]), 1)
~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/nix/store/g1337qaa5692wwgzlmpfzhmvqs41whis-python3.13-numpy-2.3.2/lib/python3.13/site-packages/numpy/linalg/tests/test_linalg.py", line 72, in assert_almost_equal
old_assert_almost_equal(a, b, decimal=decimal, **kw)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/nix/store/g1337qaa5692wwgzlmpfzhmvqs41whis-python3.13-numpy-2.3.2/lib/python3.13/site-packages/numpy/testing/_private/utils.py", line 620, in assert_almost_equal
return assert_array_almost_equal(actual, desired, decimal, err_msg)
File "/nix/store/g1337qaa5692wwgzlmpfzhmvqs41whis-python3.13-numpy-2.3.2/lib/python3.13/site-packages/numpy/testing/_private/utils.py", line 1175, in assert_array_almost_equal
assert_array_compare(compare, actual, desired, err_msg=err_msg,
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
verbose=verbose,
^^^^^^^^^^^^^^^^
header=('Arrays are not almost equal to %d decimals' % decimal),
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
precision=decimal)
^^^^^^^^^^^^^^^^^^
File "/nix/store/g1337qaa5692wwgzlmpfzhmvqs41whis-python3.13-numpy-2.3.2/lib/python3.13/site-packages/numpy/testing/_private/utils.py", line 926, in assert_array_compare
raise AssertionError(msg)
AssertionError:
Arrays are not almost equal to 6 decimals
Mismatched elements: 1 / 1 (100%)
Max absolute difference among violations: 1.52015924
Max relative difference among violations: 1.52015924
ACTUAL: array([2.520159], dtype=float32)
DESIRED: array(1)Values with OpenBLAS unavailable:
Max absolute difference among violations: 0.62125194
Max relative difference among violations: 0.62125194
ACTUAL: array([0.378748], dtype=float32)
DESIRED: array(1)Python and NumPy Versions:
2.3.2
3.13.7 (main, Aug 14 2025, 11:12:11) [GCC 14.3.0]
(Same error with NumPy 2.3.3)
Runtime Environment:
[{'numpy_version': '2.3.2',
'python': '3.13.7 (main, Aug 14 2025, 11:12:11) [GCC 14.3.0]',
'uname': uname_result(system='Linux', node='Yubel', release='6.16.9+deb14-powerpc64', version='#1 SMP PREEMPT Debian 6.16.9-1 (2025-09-27)', machine='ppc64')},
{'simd_extensions': {'baseline': [],
'found': [],
'not_found': ['VSX', 'VSX2', 'VSX3', 'VSX4']}},
{'filepath': '/nix/store/cig7c4r4rlazy95bdap50c01s92ky8ix-gcc-14.3.0-lib/lib/libgomp.so.1.0.0',
'internal_api': 'openmp',
'num_threads': 2,
'prefix': 'libgomp',
'user_api': 'openmp',
'version': None}]
Context for the issue:
Not critical since the test can be disabled, but it popped up while testing the packaging in Nixpkgs.
NixOS/nixpkgs#450059
Debian also disables this and afew more tests on similarly exotic architectures. I couldn't find any reports of these failures on your repo, maybe worth communicating with the Debian ppl to resolve these?
https://salsa.debian.org/python-team/packages/numpy/-/commit/29ab13db78935fe5cc6795dd85a969a858282fc7