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Additional error checking for permutation methods

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SimpleArt
2020-12-20 14:00:52 -05:00
parent ef3be9d5d1
commit 91da18cf54
1 changed files with 16 additions and 0 deletions
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16
src/crossover/crossover_methods.py
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@ -228,6 +228,14 @@ class Crossover_Methods:
"""Cross two parents by slicing out a random part of one parent """Cross two parents by slicing out a random part of one parent
and then filling in the rest of the genes from the second parent.""" and then filling in the rest of the genes from the second parent."""
# Too small to cross
if len(parent_1) < 2:
return parent_1.gene_list
# Unequal parent lengths
if len(parent_1) != len(parent_2):
raise ValueError("Parents do not have the same lengths.")
# Swap with weighted probability so that most of the genes # Swap with weighted probability so that most of the genes
# are taken directly from parent 1. # are taken directly from parent 1.
if random.choices([0, 1], cum_weights = [weight, 1]) == 1: if random.choices([0, 1], cum_weights = [weight, 1]) == 1:
@ -267,6 +275,14 @@ class Crossover_Methods:
and then filling in the rest of the genes from the second parent, and then filling in the rest of the genes from the second parent,
preserving the ordering of genes wherever possible.""" preserving the ordering of genes wherever possible."""
# Too small to cross
if len(parent_1) < 2:
return parent_1.gene_list
# Unequal parent lengths
if len(parent_1) != len(parent_2):
raise ValueError("Parents do not have the same lengths.")
# Swap with weighted probability so that most of the genes # Swap with weighted probability so that most of the genes
# are taken directly from parent 1. # are taken directly from parent 1.
if random.choices([0, 1], cum_weights = [weight, 1]) == 1: if random.choices([0, 1], cum_weights = [weight, 1]) == 1: