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BUG: Make mask_invalid consistent with mask_where if copy is set to False #22046

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Merged
merged 3 commits into from
Oct 5, 2022
Merged

BUG: Make mask_invalid consistent with mask_where if copy is set to False #22046

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44c8da9
Make mask_invalid consistent with mask_where when copy is set to Fals…
cmarmo Jul 26, 2022
2d73e10
Fix lint.
cmarmo Jul 26, 2022
4213779
Remove try statement. Add test.
cmarmo Sep 7, 2022
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14 changes: 1 addition & 13 deletions numpy/ma/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2356,20 +2356,8 @@ def masked_invalid(a, copy=True):
fill_value=1e+20)

"""
a = np.array(a, copy=copy, subok=True)
mask = getattr(a, '_mask', None)
if mask is not None:
condition = ~(np.isfinite(getdata(a)))
if mask is not nomask:
condition |= mask
cls = type(a)
else:
condition = ~(np.isfinite(a))
cls = MaskedArray
result = a.view(cls)
result._mask = condition
return result

return masked_where(~(np.isfinite(getdata(a))), a, copy=copy)

###############################################################################
# Printing options #
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12 changes: 12 additions & 0 deletions numpy/ma/tests/test_core.py
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Expand Up @@ -4496,6 +4496,14 @@ def test_where_structured_masked(self):
assert_equal(ma, expected)
assert_equal(ma.mask, expected.mask)

def test_masked_invalid_error(self):
a = np.arange(5, dtype=object)
a[3] = np.PINF
a[2] = np.NaN
with pytest.raises(TypeError,
match="not supported for the input types"):
np.ma.masked_invalid(a)

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We were looking at this in the triage meeting as well. I guess the test is great (I honestly still need to parse it fully).
But we are missing an additional test for the successful path that was fixed I think: Checking that the array was indeed modified in-place with copy=False?

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I have added a new test in test_masked_array_no_copy() ... just to explain myself: I didn't add it in the first place because mask_invalid becomes a straight call of masked_where which is already tested. But I guess the more tests we have the better?
Thanks!

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Yeah, thanks. It is true that masked_where is tested, but it is also just nice to see the fix in action in the PR and we mainly have integration tests anyway.

A test too much cannot hurt :).

I find it odd that we consider inf invalid by default, but that is not a change.

Thanks @cmarmo, lets get this in!

def test_choose(self):
# Test choose
choices = [[0, 1, 2, 3], [10, 11, 12, 13],
Expand Down Expand Up @@ -5309,6 +5317,10 @@ def test_masked_array_no_copy():
a = np.ma.array([1, 2, 3, 4], mask=[1, 0, 0, 0])
_ = np.ma.masked_where(a == 3, a, copy=False)
assert_array_equal(a.mask, [True, False, True, False])
# check masked array with masked_invalid is updated in place
a = np.ma.array([np.inf, 1, 2, 3, 4])
_ = np.ma.masked_invalid(a, copy=False)
assert_array_equal(a.mask, [True, False, False, False, False])

def test_append_masked_array():
a = np.ma.masked_equal([1,2,3], value=2)
Expand Down