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31 lines
967 B
Python
31 lines
967 B
Python
from nose.tools import assert_less_equal, assert_almost_equal
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from wordfreq import half_harmonic_mean
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from functools import reduce
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import random
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def check_hm_properties(inputs):
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# I asserted that the half-harmonic-mean formula is associative,
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# commutative, monotonic, and less than or equal to its inputs.
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# (Less if its inputs are strictly positive, in fact.)
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#
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# So let's test that what I said is true.
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hm1 = reduce(half_harmonic_mean, inputs)
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random.shuffle(inputs)
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hm2 = reduce(half_harmonic_mean, inputs)
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assert_almost_equal(hm1, hm2)
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inputs[0] *= 2
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hm3 = reduce(half_harmonic_mean, inputs)
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assert_less_equal(hm2, hm3)
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def test_half_harmonic_mean():
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for count in range(2, 6):
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for rep in range(10):
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# get some strictly positive arbitrary numbers
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inputs = [random.expovariate(0.01)
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for i in range(count)]
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yield check_hm_properties, inputs
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