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TST Complete test for pairwise_distance_{argmin,argmin_min} #22371

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Merged
merged 4 commits into from
Feb 8, 2022
Merged

TST Complete test for pairwise_distance_{argmin,argmin_min} #22371

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c9a8723
TST Complete tests for pairwise_distance_{argmin,argmin_min}
jjerphan Feb 4, 2022
f6caee0
CLN Address review comments
jjerphan Feb 4, 2022
6679d86
Use appropriate function to test
jjerphan Feb 8, 2022
08476fa
Merge branch 'main' into tst/pairwise_distances_argmin_min-axis
jjerphan Feb 8, 2022
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24 changes: 24 additions & 0 deletions sklearn/metrics/tests/test_pairwise.py
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Original file line number Diff line number Diff line change
Expand Up @@ -505,6 +505,30 @@ def test_pairwise_distances_argmin_min():
np.testing.assert_almost_equal(dist_orig_ind, dist_chunked_ind, decimal=7)
np.testing.assert_almost_equal(dist_orig_val, dist_chunked_val, decimal=7)

# Changing the axis and permuting datasets must give the same results
argmin_0, dist_0 = pairwise_distances_argmin_min(X, Y, axis=0)
argmin_1, dist_1 = pairwise_distances_argmin_min(Y, X, axis=1)

assert_allclose(dist_0, dist_1)
assert_array_equal(argmin_0, argmin_1)

argmin_0, dist_0 = pairwise_distances_argmin_min(X, X, axis=0)
argmin_1, dist_1 = pairwise_distances_argmin_min(X, X, axis=1)

assert_allclose(dist_0, dist_1)
assert_array_equal(argmin_0, argmin_1)

# Changing the axis and permuting datasets must give the same results
argmin_0 = pairwise_distances_argmin(X, Y, axis=0)
argmin_1 = pairwise_distances_argmin(Y, X, axis=1)

assert_array_equal(argmin_0, argmin_1)

argmin_0 = pairwise_distances_argmin(X, X, axis=0)
argmin_1 = pairwise_distances_argmin(X, X, axis=1)

assert_array_equal(argmin_0, argmin_1)


def _reduce_func(dist, start):
return dist[:, :100]
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