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Added customizable weighted random method

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SimpleArt
2020-12-29 19:33:04 -05:00
parent a1d72ec868
commit 5fc910fd17
1 changed files with 11 additions and 0 deletions
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11
src/attributes.py
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@ -204,6 +204,17 @@ class Attributes:
#===========================# #===========================#
def weighted_random(self, weight):
"""Returns a random value between 0 and 1. Returns values between the weight and the
nearest of 0 and 1 less frequently than between weight and the farthest of 0 and 1.
"""
rand_num = random.random()
if rand_num < weight:
return (1-weight) * rand_num / weight
else:
return 1 - weight * (1-rand_num) / (1-weight)
def dist(self, chromosome_1, chromosome_2): def dist(self, chromosome_1, chromosome_2):
"""Default distance lambda. Returns the square root of the difference in fitnesses.""" """Default distance lambda. Returns the square root of the difference in fitnesses."""
return sqrt(abs(chromosome_1.fitness - chromosome_2.fitness)) return sqrt(abs(chromosome_1.fitness - chromosome_2.fitness))