def test_crossover(self):
genome1 = Genome(self.genome_params)
genome2 = Genome(self.genome_params)
genome1.connect()
genome2.connect()
genome1.fitness = 5
genome2.fitness = 20
genome2.mutate()
assert len(genome2.nodes) == 4
assert len(genome2.connection_genes) == 4
assert genome2.connection_genes[3].innovation_number == 4
disabled_gene = None
for idx, cg in enumerate(genome2.connection_genes):
if not cg.enabled:
disabled_gene = idx
break
child = genome2.crossover(genome1, genome2)
# child inherited fittest parent nodes
assert len(child.nodes) == len(genome2.nodes)
# should be of same length despite some being disjoint genes
assert len(child.connection_genes) == len(genome2.connection_genes)
# check child got disabled gene transferred
assert not child.connection_genes[disabled_gene].enabled
def breed(self, species):
performing_species = []
for s in species:
# if not s.staleness > self.stagnation_params.max_stagnation:
performing_species.append(s)
if not performing_species:
raise Exception()
species_members_count = tuple(
[len(s.members) for s in performing_species])
new_society = []
# use the best performing species, if any
for idx, s in enumerate(performing_species):
spec_members = s.members
if species_members_count[idx] == 1:
new_society.append(spec_members[0])
elif species_members_count[idx] == 2:
parent1 = spec_members[0]
parent2 = spec_members[1]
if parent1.fitness < parent2.fitness:
parent1, parent2 = parent2, parent1
new_society.append(parent1)
offspring = Genome(self.genome_params)
offspring.connect()
offspring = offspring.crossover(parent1, parent2)
offspring.mutate()
new_society.append(offspring)
else:
added = 0
spec_members.sort(key=lambda e: e.fitness, reverse=True)
if self.reproduction_params.elitism > 0:
# this must be changed
elite_top_idx = self.reproduction_params.elitism
if not floor(species_members_count[idx] /
2) >= self.reproduction_params.elitism:
elite_top_idx = 1
for elite in spec_members[:elite_top_idx]:
new_society.append(elite)
spec_members.remove(elite)
added += 1
# use some sort of criteria to ensure
# there'll be at least 2 parents breeding
# otherwise it'll breed a genetically identical offspring
# cull_count = max(round(self.reproduction_params.survival_threshold * len(spec_members)), 2)
#
# spec_members = spec_members[:cull_count]
while added < species_members_count[idx]:
r1 = random.randint(0, len(spec_members) - 1)
r2 = random.randint(0, len(spec_members) - 1)
parent1 = spec_members[r1]
parent2 = spec_members[r2]
offspring = Genome(self.genome_params)
offspring.connect()
offspring = offspring.crossover(parent1, parent2)
offspring.mutate()
new_society.append(offspring)
added += 1
if len(new_society) > self.genome_params.population_size:
new_society = new_society[:self.genome_params.population_size]
return new_society