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Population.next_population and better comments

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This commit is contained in:
SimpleArt
2020-10-15 00:22:58 -04:00
parent 543b295e52
commit 5df19df643
6 changed files with 160 additions and 59 deletions
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6
src/parent_selection/parent_selection_methods.py
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@ -110,8 +110,10 @@ class Parent_Selection:
print("Selection probability must be between 0 and 1 to select parents.")
return
max_fitness = ga.population.get_chromosome(0).get_fitness()
# Error if the highest fitness is not positive
if ga.population.get_chromosome(0).get_fitness() <= 0:
if max_fitness <= 0:
print("Error using stochastic roulette selection, best fitness must be positive.")
print("Consider using tournament selection.")
return
@ -123,5 +125,5 @@ class Parent_Selection:
index = random.randint(0, ga.population.size()-1)
# Probability of becoming a parent is fitness/max_fitness
if random.uniform(ga.selection_probability, 1) < ga.population.get_chromosome(index).get_fitness() / ga.population.get_chromosome(0).get_fitness():
if random.uniform(ga.selection_probability, 1) < ga.population.get_chromosome(index).get_fitness()/max_fitness:
ga.population.set_parent(index)