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Added selection_probability to stochastic selection.

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SimpleArt
2020-12-02 18:50:59 -05:00
parent df05cf1f5c
commit 23efae27dc
1 changed files with 14 additions and 0 deletions
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14
src/parent_selection/parent_selection_methods.py
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@ -204,5 +204,19 @@ class Parent_Selection:
in range(len(ga.population)) in range(len(ga.population))
] ]
sum_weights = sum(weights)
# Rescale and adjust using selection_probability
# so that
# if selection_probability is high,
# parents are more likely selected based on fitness.
# if selection_probability is low,
# parents are more likely selected based on randomness.
weights = [
weight / sum_weights - ga.selection_probability + 1
for weight
in weights
]
# Set the mating pool. # Set the mating pool.
ga.population.mating_pool = random.choices(ga.population, weights, k = parent_amount) ga.population.mating_pool = random.choices(ga.population, weights, k = parent_amount)