def run_round(self, task):
results = zip(self.stable, self.pool.map(task, self.stable))
if self.best:
results.append(self.best)
print "Ranking winners"
ranked_results = sorted(
results,
key=lambda (n, r): self.fitness_function(r),
reverse=True
)
best_result = ranked_results[0]
self.best = best_result
bn, best = best_result
wn, worst = ranked_results[-1]
print "Best score was", best, bn.name
print "Worst score was", worst, wn.name
cream = ranked_results[:self.cream]
cream = [n for n, s in cream]
print "Selected", len(cream), "best networks"
new_class = []
for _ in range(self.cream):
new_blood = Network(*self.network_parameters)
new_blood.initialise(self.rng)
new_class.append(new_blood)
while len(new_class) < self.class_size:
new_network = Network(*self.network_parameters)
new_network.cross(self.rng, *cream)
new_class.append(new_network)
self.stable = new_class
print "Produced", len(self.stable), "new networks"
def test_crossing_networks():
network_params = (10, 7, 4)
net1 = Network(*network_params)
net2 = Network(*network_params)
rng = Random("tests")
net1.initialise(rng)
net2.initialise(rng)
net3 = Network(*network_params)
net3.cross(rng, net1, net2)
