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replacepopulationpyevolve

Population replacement pyevolve

Looking for a way to reuse 50% of previous population best individuals in different GA iteration .

For example at the end of current iteration inside a process do "population = ga.getPopulation()".Next iteration initialize 50% of that pop.

Does anyone know how to handle the population results?

Solution

  • Slices of code applied to this problem.

    Function required:

    def createOwnGen(self , ga_engine):
        gen = ga_engine.getCurrentGeneration()
        if gen == 0 and self.previous_population != []:
            population = ga_engine.getPopulation()
            popSize = len(population)
            for i in xrange(popSize/2):
                population[popSize/2+i] = self.previous_population[i]
            population.sort()
        return False

    stepCallback (native function from pyevolve) is called in every generation .

    ....
ga.stepCallback.set(self.createOwnGen)
....
bestIndividue = ga.bestIndividual()
population = ga.getPopulation()
self.previous_population = population.internalPop
....