def conditional_precedence_reserving_mutation(problem, child, probability):
new_child = Heuristics.mutation_operation(child, probability)
new_child2 = Heuristics.mutation_machine(new_child, probability)
return min([child, new_child, new_child2],
key=lambda x: Chromosome.compute_makespan(x, problem))
def precedence_reserving_mutation(problem, child, probability):
new_child = Heuristics.mutation_operation(child, probability)
new_child2 = Heuristics.mutation_machine(new_child, probability)
return new_child2