8000 Add a test for numeric precision (see #9354) by kno10 · Pull Request #12128 · scikit-learn/scikit-learn · GitHub
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Add a test for numeric precision (see #9354) #12128

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Add a test for numeric precision (see #9354) #12128

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12 changes: 12 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 @@ -874,3 +874,15 @@ def test_check_preserve_type():
59FB XB.astype(np.float))
assert_equal(XA_checked.dtype, np.float)
assert_equal(XB_checked.dtype, np.float)

def test_euclidean_precision32():
"""dot(x,x) - 2 dot(x,y) + dot(y,y) has catastrophic precision"""
XA = np.array([[10000]], np.float32)
XB = np.array([[10001]], np.float32)
assert_equal(euclidean_distances(XA, XB)[0,0], 1)

def test_euclidean_precision64():
"""dot(x,x) - 2 dot(x,y) + dot(y,y) has catastrophic precision"""
XA = np.array([[100000000]])
XB = np.array([[100000001]])
assert_equal(euclidean_distances(XA, XB)[0,0], 1)
0