mirror of
https://github.com/rspeer/wordfreq.git
synced 2024-12-23 17:31:41 +00:00
31 lines
967 B
Python
31 lines
967 B
Python
from nose.tools import assert_less_equal, assert_almost_equal
|
|
from wordfreq import half_harmonic_mean
|
|
from functools import reduce
|
|
import random
|
|
|
|
|
|
def check_hm_properties(inputs):
|
|
# I asserted that the half-harmonic-mean formula is associative,
|
|
# commutative, monotonic, and less than or equal to its inputs.
|
|
# (Less if its inputs are strictly positive, in fact.)
|
|
#
|
|
# So let's test that what I said is true.
|
|
hm1 = reduce(half_harmonic_mean, inputs)
|
|
random.shuffle(inputs)
|
|
hm2 = reduce(half_harmonic_mean, inputs)
|
|
assert_almost_equal(hm1, hm2)
|
|
|
|
inputs[0] *= 2
|
|
hm3 = reduce(half_harmonic_mean, inputs)
|
|
assert_less_equal(hm2, hm3)
|
|
|
|
|
|
def test_half_harmonic_mean():
|
|
for count in range(2, 6):
|
|
for rep in range(10):
|
|
# get some strictly positive arbitrary numbers
|
|
inputs = [random.expovariate(0.01)
|
|
for i in range(count)]
|
|
yield check_hm_properties, inputs
|
|
|