def test_ktau_relative_distances():
"""Compares relative distances of weighted rankings"""
r1 = [0.05, 0.2, 0.7, 0.05]
r2 = [0.23, 0.24, 0.26, 0.27]
r3 = [0.22, 0.24, 0.26, 0.28]
# r2 and r3 should be closer than r2 to r1
assert ktau_weighted_distance(r2, r3) < ktau_weighted_distance(r2, r1)
def test_ktau_symmetry():
"""Checks symmetry holds for distance metric"""
r1 = [0.1, 0.2, 0.7]
assert ktau_weighted_distance(r1, r1) == 0
def test_ktau_accuracy():
""" Floating point accuracy test for testing faster calculation methods """
r1 = [0.27, 0.24, 0.26, 0.23]
r2 = [0.05, 0.2, 0.7, 0.05]
assert ktau_weighted_distance(r1, r2) == 0.0031050000000000006
assert mergeSortDistance(r1, r2) == 0.0031050000000000006
