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BUG: The output of np.vectorize for int32 inputs is promoted to int64 · Issue #29189 · numpy/numpy · GitHub

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BUG: The output of np.vectorize for int32 inputs is promoted to int64 #29189

Description

Describe the issue:

It seems that the dtype of np.vectorize results differs between NumPy 2.2 and earlier versions and NumPy 2.3. Is this an intended change?

Reproduce the code example:

>>> np.vectorize(lambda x: x + x)(np.array([1, 2, 3, 4], dtype=np.int32)).dtype
dtype('int64')  # dtype('int32') if numpy<=2.2

Python and NumPy Versions:

Python: 3.13.1
NumPy: 2.3.0

Runtime Environment:

>>> np.show_runtime()
[{'numpy_version': '2.3.0',
  'python': '3.13.1 (main, Jan  7 2025, 10:32:19) [GCC 9.4.0]',
  'uname': uname_result(system='Linux', node='pg00', release='5.15.0-135-generic', version='#146-Ubuntu SMP Sat Feb 15 17:06:22 UTC 2025', machine='x86_64')},
 {'simd_extensions': {'baseline': ['SSE', 'SSE2', 'SSE3'],
                      'found': ['SSSE3',
                                'SSE41',
                                'POPCNT',
                                'SSE42',
                                'AVX',
                                'F16C',
                                'FMA3',
                                'AVX2',
                                'AVX512F',
                                'AVX512CD',
                                'AVX512_SKX'],
                      'not_found': ['AVX512_KNL',
                                    'AVX512_KNM',
                                    'AVX512_CLX',
                                    'AVX512_CNL',
                                    'AVX512_ICL',
                                    'AVX512_SPR']}},
 {'architecture': 'SkylakeX',
  'filepath': '/home/imanishi/.pyenv/versions/3.13.1/lib/python3.13/site-packages/numpy.libs/libscipy_openblas64_-56d6093b.so',
  'internal_api': 'openblas',
  'num_threads': 64,
  'prefix': 'libscipy_openblas',
  'threading_layer': 'pthreads',
  'user_api': 'blas',
  'version': '0.3.29'}]

Context for the issue:

If this behavior is intentional, we will update new CuPy versions to conform to ensure compatibility with this NumPy specification.

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