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fix NoCrossover missing offsprings #744

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fix NoCrossover missing offsprings #744

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cf56c5b
fix NoCrossover missing offsprings
gideonoludeyi Jul 17, 2025
ab1dc5b
enforce consistent number of parents and offsprings in NoCrossover
gideonoludeyi Aug 3, 2025
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8 changes: 5 additions & 3 deletions pymoo/operators/crossover/nox.py
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Original file line number Diff line number Diff line change
@@ -1,10 +1,12 @@
import itertools

from pymoo.core.crossover import Crossover
from pymoo.core.population import Population


class NoCrossover(Crossover):
def __init__(self, *, n_parents=1, n_offsprings=1, prob=0.0, **kwargs):
super().__init__(n_parents, n_offsprings, prob, **kwargs)
def __init__(self, *, n_parents=1, prob=0.0, **kwargs):
super().__init__(n_parents, n_parents, prob, **kwargs)

def do(self, problem, pop, *args, random_state, **kwargs):
return Population.create(*[random_state.choice(parents) for parents in pop])
return Population.create(*itertools.chain.from_iterable(pop))
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