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eugeneyan/test_gini.py

Last active February 21, 2021 19:06
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Test Gini impurity and gain
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test_gini.py
def test_gini_impurity():
assert round(gini_impurity([1, 1, 1, 1, 1, 1, 1, 1]), 3) == 0
assert round(gini_impurity([1, 1, 1, 1, 1, 1, 1, 0]), 3) == 0.219
assert round(gini_impurity([1, 1, 1, 1, 1, 1, 0, 0]), 3) == 0.375
assert round(gini_impurity([1, 1, 1, 1, 1, 0, 0, 0]), 3) == 0.469
assert round(gini_impurity([1, 1, 1, 1, 0, 0, 0, 0]), 3) == 0.500
def test_gini_gain():
assert round(gini_gain([1, 1, 1, 1, 0, 0, 0, 0], [[1, 1, 1, 1], [0, 0, 0, 0]]), 3) == 0.5
assert round(gini_gain([1, 1, 1, 1, 0, 0, 0, 0], [[1, 1, 1, 0], [0, 0, 0, 1]]), 3) == 0.125
assert round(gini_gain([1, 1, 1, 1, 0, 0, 0, 0], [[1, 0, 0, 0], [0, 1, 1, 1]]), 3) == 0.125
assert round(gini_gain([1, 1, 1, 1, 0, 0, 0, 0], [[1, 1, 0, 0], [0, 0, 1, 1]]), 3) == 0.0
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