8000 BUG: assert_equal fails on object arrays of nan · Issue #9023 · numpy/numpy · GitHub
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BUG: assert_equal fails on object arrays of nan #9023

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eric-wieser opened this issue Apr 29, 2017 · 1 comment
Open

BUG: assert_equal fails on object arrays of nan #9023

eric-wieser opened this issue Apr 29, 2017 · 1 comment
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00 - Bug component: numpy.testing

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@eric-wieser
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The following fails:

import numpy as np
from numpy.testing import assert_equal 
a = np.array([1, 2, np.nan], object)
assert_equal(a, a)
AssertionError:
Arrays are not equal

(mismatch 33.33333333333333%)
 x: array([1, 2, nan], dtype=object)
 y: array([1, 2, nan], dtype=object)
This was referenced Apr 29, 2017
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@h-vetinari
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h-vetinari commented Apr 12, 2023 •
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Also affects other assert functions like assert_array_equal, assert_allclose

Additionally, assert_allclose fails on empty object arrays:

>>> np.__version__
'1.24.2'
>>> x = np.array([], dtype=object)
>>> np.testing.assert_allclose(x, x)
Traceback (most recent call last):
[...]
TypeError: ufunc 'isfinite' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

@h-vetinari h-vetinari mentioned this issue Dec 26, 2023
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