Issue 10 in ecspy: Multiprocessing evaluator fails on OS X

[ec...@googlecode.com]

Status: Accepted
Owner: aaron.lee.garrett
Labels: Type-Defect Priority-Medium OpSys-OSX

New issue 10 by aaron.lee.garrett: Multiprocessing evaluator fails on OS X
http://code.google.com/p/ecspy/issues/detail?id=10

The following code works correctly on Windows and Ubuntu, but it crashes on
OS X:

{{{
from random import Random
from time import time
import ecspy
import logging
import math

def generate_rastrigin(random, args):
size = args.get('num_inputs', 10)
return [random.uniform(-5.12, 5.12) for i in xrange(size)]

def evaluate_rastrigin(candidates, args):
fitness = []
for cs in candidates:
fit = 10 * len(cs) + sum([((x - 1)**2 - 10 * math.cos(2 * math.pi *
(x - 1))) for x in cs])
fitness.append(fit)
return fitness

def main(prng=None):
if prng is None:
prng = Random()
prng.seed(time())

ea = ecspy.ec.ES(prng)
ea.observer = ecspy.observers.screen_observer
ea.terminator = ecspy.terminators.evaluation_termination
final_pop = ea.evolve(generator=generate_rastrigin,
evaluator=ecspy.evaluators.parallel_evaluation_mp,
mp_evaluator=evaluate_rastrigin,
mp_num_cpus=8,
pop_size=8,
bounder=ecspy.ec.Bounder(-5.12, 5.12),
maximize=False,
max_evaluations=256,
mutation_rate=0.2,
use_one_fifth_rule=True,
num_inputs=3)
best = max(final_pop)
print('%s Example (%s) Best Solution: \n%s' %
(ea.__class__.__name__, "Rastrigin", str(best)))
return ea

if __name__ == '__main__':
main()
}}}

What is the expected output? What do you see instead?

The expected output is to see the result of the successful evolution. The
output on OS X is "PicklingError: Can't pickle <type 'function'>: attribute
lookup __builtin__.function failed"

Attachments:
parallel_evaluation_mp_example.py 1.5 KB

[ec...@googlecode.com]

Updates:
Status: Invalid

Comment #1 on issue 10 by aaron.lee.garrett: Multiprocessing evaluator

fails on OS X
http://code.google.com/p/ecspy/issues/detail?id=10

After updating the MacPorts packages, this issue resolved itself.