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Edge case for converting fitness to minimization

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Avoid catastrophic cancellations
This commit is contained in:
SimpleArt
2020-11-09 16:02:01 -05:00
parent ce0d879f82
commit 9c455957f2
1 changed files with 4 additions and 1 deletions
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3
src/EasyGA.py
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@ -141,6 +141,9 @@ class GA(Attributes):
if self.target_fitness_type == 'max': return fitness_value if self.target_fitness_type == 'max': return fitness_value
max_fitness = self.population.get_chromosome(-1).get_fitness() max_fitness = self.population.get_chromosome(-1).get_fitness()
min_fitness = self.population.get_chromosome(0).get_fitness() min_fitness = self.population.get_chromosome(0).get_fitness()
if min_fitness / max_fitness < 1e-5:
return -fitness_value
else:
return max_fitness - fitness_value + min_fitness return max_fitness - fitness_value + min_fitness