pyevolve crashes on using multiprocessing

[Shayan RC]

I am using pyevolve 0.6rc.

My code is as follows:

    setOfAlleles = GAllele.GAlleles()

    period_range = GAllele.GAlleleRange(3, 60)

    multiplier_range = GAllele.GAlleleRange(1, 10)

    setOfAlleles.add(period_range)

    setOfAlleles.add(multiplier_range)

    genome = G1DList.G1DList(2)

    genome.setParams(allele=setOfAlleles)

    genome.evaluator.set(evaluate_strategy)

    genome.mutator.set(Mutators.G1DListMutatorAllele)

    genome.initializator.set(Initializators.G1DListInitializatorAllele)

    ga = GSimpleGA.GSimpleGA(genome)

    ga.selector.set(Selectors.GRankSelector)

    ga.setGenerations(50)

    ga.setPopulationSize(20)

    ga.setMutationRate(0.2)

    ga.setElitism(True)

    ga.setMinimax(Consts.minimaxType["maximize"])

    ga.setElitismReplacement(5)

    pop = ga.getPopulation()

    pop.setMultiProcessing(flag=True, full_copy=False)

    ga.evolve(freq_stats=1)

Whenever I set multiprocessing to True, it crashes with the following error:

Traceback (most recent call last):

  File "/run/media/xion/storage/WorkSpace/Backtesters/GA_Optimize.py", line 103, in <module>

    ga.evolve(freq_stats=1)

  File "/usr/lib/python2.7/site-packages/pyevolve/GSimpleGA.py", line 755, in evolve

    self.internalPop.evaluate()

  File "/usr/lib/python2.7/site-packages/pyevolve/GPopulation.py", line 373, in evaluate

    results = proc_pool.map(multiprocessing_eval, self.internalPop)

  File "/usr/lib/python2.7/multiprocessing/pool.py", line 251, in map

    return self.map_async(func, iterable, chunksize).get()

  File "/usr/lib/python2.7/multiprocessing/pool.py", line 567, in get

    raise self._value

AssertionError

Can anyone tell me what is the cause of AssertionErro and how to fix it?

It works fine without multiprocessing.

[Saeed Soltani Moghadam]

Dear

First try to install this version since the version you're using now is somehow a buggy one.

pip install https://github.com/perone/Pyevolve/archive/master.zip

then try the following:

ga.setMultiProcessing(True,False,4)

you may need to change "4" according to number of processor you want to use.