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BUG: The input and output of rollaxis vary in flags.C_CONTIGUOUS and flags.F_CONTIGUOUS #27855

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AnonymousPlayer2000 opened this issue Nov 26, 2024 · 2 comments
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BUG: The input and output of rollaxis vary in flags.C_CONTIGUOUS and flags.F_CONTIGUOUS #27855

AnonymousPlayer2000 opened this issue Nov 26, 2024 · 2 comments
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@AnonymousPlayer2000
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AnonymousPlayer2000 commented Nov 26, 2024 •
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Describe the issue:

I find that the input and output of rollaxis vary in flags.C_CONTIGUOUS and flags.F_CONTIGUOUS.

Reproduce the code example:

import numpy as np

a1 = np.array([[[0], [0], [36]], [[1], [-64], [0]], [[-58], [0], [12]], [[-78], [1], [-1]]], order='C')
print("a1.C_CONTIGUOUS:", a1.flags['C_CONTIGUOUS'], "a1.F_CONTIGUOUS:", a1.flags['F_CONTIGUOUS'])
a2 = np.rollaxis(a1, 0, start=2)
print("a2.C_CONTIGUOUS:", a2.flags['C_CONTIGUOUS'], "a2.F_CONTIGUOUS:", a2.flags['F_CONTIGUOUS'])

Error message:

a1.C_CONTIGUOUS: True a1.F_CONTIGUOUS: False
a2.C_CONTIGUOUS: False a2.F_CONTIGUOUS: True

Python and NumPy Versions:

2.1.3
3.10.15 (main, Oct  3 2024, 07:27:34) [GCC 11.2.0]

Runtime Environment:

[{'numpy_version': '2.1.3',
  'python': '3.10.15 (main, Oct  3 2024, 07:27:34) [GCC 11.2.0]',
  'uname': uname_result(system='Linux', release='6.8.0-48-generic', version='#48~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Oct  7 11:24:13 UTC 2', machine='x86_64')},
 {'simd_extensions': {'baseline': ['SSE', 'SSE2', 'SSE3'],
                      'found': ['SSSE3',
                                'SSE41',
                                'POPCNT',
                                'SSE42',
                                'AVX',
                                'F16C',
                                'FMA3',
                                'AVX2'],
                      'not_found': ['AVX512F',
                                    'AVX512CD',
                                    'AVX512_KNL',
                                    'AVX512_KNM',
                                    'AVX512_SKX',
                                    'AVX512_CLX',
                                    'AVX512_CNL',
                                    'AVX512_ICL']}},
 {'architecture': 'Haswell',
  'filepath': '/path/python3.10/site-packages/numpy.libs/libscipy_openblas64_-ff651d7f.so',
  'internal_api': 'openblas',
  'num_threads': 24,
  'prefix': 'libscipy_openblas',
  'threading_layer': 'pthreads',
  'user_api': 'blas',
  'version': '0.3.27'}]

Context for the issue:

I do not find information related to this issue in the doc and can not determine whether this issue is expected or a bug.
@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: reshape returns different array with different order parameter BUG: reshape returns different arrays with different order parameters Nov 26, 2024
@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: reshape returns different arrays with different order parameters BUG: reshape returns different arrays with "A"/None Nov 26, 2024
@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: reshape returns different arrays with "A"/None BUG: reshape returns different arrays with ("C"/"A") Nov 26, 2024
@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: reshape returns different arrays with ("C"/"A") BUG: reshape returns different arrays with (C/A) orders Nov 26, 2024
@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: reshape returns different arrays with (C/A) orders BUG: The input and output and rollaxis' has the different orders. Nov 26, 2024
@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: The input and output and rollaxis' has the different orders. BUG: The input and output of rollaxis has the different orders. Nov 26, 2024
@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: The input and output of rollaxis has the different orders. BUG: The input and output of rollaxis vary in flags.C_CONTIGUOUS and flags.C_CONTIGUOUS. Nov 26, 2024
@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: The input and output of rollaxis vary in flags.C_CONTIGUOUS and flags.C_CONTIGUOUS. BUG: The input and output of rollaxis vary in flags.C_CONTIGUOUS and flags.F_CONTIGUOUS. Nov 26, 2024
@AnonymousPlayer2000
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I find that the issue is related to the start parameter. When the start is 0 and 1, the input and out's flags.C_CONTIGUOUS and flags.F_CONTIGUOUS are same.

@AnonymousPlayer2000 AnonymousPlayer2000 changed the title BUG: The input and output of rollaxis vary in flags.C_CONTIGUOUS and flags.F_CONTIGUOUS. BUG: The input and output of rollaxis vary in flags.C_CONTIGUOUS and flags.F_CONTIGUOUS Nov 26, 2024
@seberg
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seberg commented Nov 26, 2024

The behavior is correct, since this always returns a view. (Even otherwise, we don't strictly guarantee preserving this anyway, but often it makes sense to either way.)

@seberg seberg closed this as not planned Won't fix, can't repro, duplicate, stale Nov 26, 2024
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