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# BSD 3-Clause License; see https://github.com/scikit-hep/awkward/blob/main/LICENSE
from __future__ import annotations
import pytest
import awkward as ak
def _min_pair(array, mask):
array = ak.typetracer.length_zero_if_typetracer(array)
# Find location of minimum 0 slot
i_min = ak.argmin(array["0"], axis=-1, keepdims=True, mask_identity=True)
# Index into array
pair_min = ak.ravel(array[ak.from_regular(i_min)], highlevel=False)
if mask:
return pair_min
else:
form = pair_min.content.form
length_one_content = form.length_one_array(
backend=pair_min.backend, highlevel=False
)
identity_content = ak.fill_none(length_one_content, 0, highlevel=False)
identity = ak.record.Record(identity_content, 0)
return ak.fill_none(pair_min, identity, highlevel=False)
def _argmin_pair(array, mask):
array = ak.typetracer.length_zero_if_typetracer(array)
assert not mask
# Find location of minimum 0 slot
return ak.argmin(array["0"], axis=-1, keepdims=False, mask_identity=mask)
def _argmin_pair_bad(array, mask):
array = ak.typetracer.length_zero_if_typetracer(array)
assert not mask
# Find location of minimum 0 slot
return ak.argmin(array["0"], axis=-1, keepdims=False, mask_identity=True)
def test_non_positional():
behavior = {(ak.min, "pair"): _min_pair}
x = ak.Array(
[
[
[1, 2, 3],
[5, 4, 3],
[2],
],
[
[8],
[],
[10, 4, 4],
],
]
)
y = 2 * x - x**2
z = ak.zip((x, y), with_name="pair", behavior=behavior)
assert ak.almost_equal(
ak.min(z, axis=-1, mask_identity=True),
ak.Array(
[
[(1, 1), (3, -3), (2, 0)],
[
(8, -48),
None,
(4, -8),
],
],
with_name="pair",
),
)
assert ak.almost_equal(
ak.min(z, axis=-1, mask_identity=False),
ak.Array(
[
[(1, 1), (3, -3), (2, 0)],
[
(8, -48),
(0, 0),
(4, -8),
],
],
with_name="pair",
),
)
def test_positional_bad():
behavior = {(ak.argmin, "pair"): _argmin_pair_bad}
x = ak.Array(
[
[
[1, 2, 3],
[5, 4, 3],
[2],
],
[
[8],
[],
[10, 4, 4],
],
]
)
y = 2 * x - x**2
z = ak.zip((x, y), with_name="pair", behavior=behavior)
with pytest.raises(TypeError, match=r"'pair' returned an option"):
assert ak.almost_equal(
ak.argmin(z, axis=-1, mask_identity=True), [[0, 2, 0], [0, None, 1]]
)
with pytest.raises(TypeError, match=r"'pair' returned an option"):
assert ak.almost_equal(
ak.argmin(z, axis=-1, mask_identity=False), [[0, 2, 0], [0, -1, 1]]
)
def test_positional_good():
behavior = {(ak.argmin, "pair"): _argmin_pair}
x = ak.Array(
[
[
[1, 2, 3],
[5, 4, 3],
[2],
],
[
[8],
[],
[10, 4, 4],
],
]
)
y = 2 * x - x**2
z = ak.zip((x, y), with_name="pair", behavior=behavior)
assert ak.almost_equal(
ak.argmin(z, axis=-1, mask_identity=True), [[0, 2, 0], [0, None, 1]]
)
assert ak.almost_equal(
ak.argmin(z, axis=-1, mask_identity=False), [[0, 2, 0], [0, -1, 1]]
)
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