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Using random.sample to avoid dupes

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SimpleArt
2020-11-22 15:58:36 -05:00
parent cdc2b6bdfb
commit 119abea4eb
1 changed files with 13 additions and 6 deletions
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19
src/survivor_selection/survivor_selection_methods.py
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@ -17,7 +17,7 @@ class Survivor_Selection:
def fill_in_best(ga):
"""Fills in the next population with the best chromosomes from the last population"""
needed_amount = len(ga.population) - ga.population.total_children
needed_amount = len(ga.population) - len(ga.population.next_population)
return ga.population[:needed_amount]
@ -25,16 +25,23 @@ class Survivor_Selection:
def fill_in_random(ga):
"""Fills in the next population with random chromosomes from the last population"""
needed_amount = len(ga.population) - ga.population.total_children
return random.choices(ga.population, k=needed_amount)
needed_amount = len(ga.population) - len(ga.population.next_population)
return random.sample(ga.population, needed_amount)
@append_to_next_population
def fill_in_parents_then_random(ga):
"""Fills in the next population with all parents followed by random chromosomes from the last population"""
needed_amount = len(ga.population) - ga.population.total_children
parent_amount = min(ga.population.total_parents, needed_amount)
needed_amount = len(ga.population) - len(ga.population.next_population)
parent_amount = min(len(ga.population.mating_pool), needed_amount)
random_amount = needed_amount - parent_amount
return ga.population.get_mating_pool()[:parent_amount] + random.choices(ga.population, k=random_amount)
# Only parents are used.
if random_amount == 0:
return ga.population.mating_pool[:parent_amount]
# Parents need to be removed from the random sample to avoid dupes.
else:
return ga.population.mating_pool +\
random.sample(set(ga.population)-set(ga.population.mating_pool), random_amount)