It seems that my program is trying to learn until a certain point, and then it's satisfied and stops improving and changing at all. With my testing it usually goes to a value of -5 at most, and then it remains there no matter how long I keep it running. The result set does not change either.
Just to keep track of it I made my own kind of logging thing to see which did best. The array of ones and zeroes is referring to how often the AI made a right choice (1), and how often the AI made a wrong choice (0).
My goal is to get the AI to repeat a pattern of going above 0.5 and then going below 0.5, not necessarily find the odd number. This was meant as just a little test to see if I could get an AI working properly with some basic data, before doing something a bit more advanced.
But unfortunately it's not working and I am not certain why.
The code:
import os
import neat
def main(genomes, config):
networks = []
ge = []
choices = []
for _, genome in genomes:
network = neat.nn.FeedForwardNetwork.create(genome, config)
networks.append(network)
genome.fitness = 0
ge.append(genome)
choices.append([])
for x in range(25):
for i, genome in enumerate(ge):
output = networks[i].activate([x])
# print(str(x) + " - " + str(i) + " chose " + str(output[0]))
if output[0] > 0.5:
if x % 2 == 0:
ge[i].fitness += 1
choices[i].append(1)
else:
ge[i].fitness -= 5
choices[i].append(0)
else:
if not x % 2 == 0:
ge[i].fitness += 1
choices[i].append(1)
else:
ge[i].fitness -= 5
choices[i].append(0)
pass
# Optional death function, if I use this there are no winners at any point.
# if ge[i].fitness <= 20:
# ge[i].fitness -= 100
# ge.pop(i)
# choices.pop(i)
# networks.pop(i)
if len(ge) > 0:
fittest = -1
fitness = -999999
for i, genome in enumerate(ge):
if ge[i].fitness > fitness:
fittest = i
fitness = ge[i].fitness
print("Best: " + str(fittest) + " with fitness " + str(fitness))
print(str(choices[fittest]))
else:
print("Done with no best.")
def run(config_path):
config = neat.config.Config(neat.DefaultGenome, neat.DefaultReproduction, neat.DefaultSpeciesSet,
neat.DefaultStagnation, config_path)
pop = neat.Population(config)
#pop.add_reporter(neat.StdOutReporter(True))
#stats = neat.StatisticsReporter()
#pop.add_reporter(stats)
winner = pop.run(main, 100)
if __name__ == "__main__":
local_dir = os.path.dirname(__file__)
config_path = os.path.join(local_dir, "config-feedforward.txt")
run(config_path)
The NEAT config:
[NEAT]
fitness_criterion = max
fitness_threshold = 100000
pop_size = 5000
reset_on_extinction = False
[DefaultGenome]
# node activation options
activation_default = tanh
activation_mutate_rate = 0.0
activation_options = tanh
# node aggregation options
aggregation_default = sum
aggregation_mutate_rate = 0.0
aggregation_options = sum
# node bias options
bias_init_mean = 0.0
bias_init_stdev = 1.0
bias_max_value = 30.0
bias_min_value = -30.0
bias_mutate_power = 0.5
bias_mutate_rate = 0.7
bias_replace_rate = 0.1
# genome compatibility options
compatibility_disjoint_coefficient = 1.0
compatibility_weight_coefficient = 0.5
# connection add/remove rates
conn_add_prob = 0.5
conn_delete_prob = 0.5
# connection enable options
enabled_default = True
enabled_mutate_rate = 0.1
feed_forward = True
initial_connection = full
# node add/remove rates
node_add_prob = 0.2
node_delete_prob = 0.2
# network parameters
num_hidden = 0
num_inputs = 1
num_outputs = 1
# node response options
response_init_mean = 1.0
response_init_stdev = 0.0
response_max_value = 30.0
response_min_value = -30.0
response_mutate_power = 0.0
response_mutate_rate = 0.0
response_replace_rate = 0.0
# connection weight options
weight_init_mean = 0.0
weight_init_stdev = 1.0
weight_max_value = 30
weight_min_value = -30
weight_mutate_power = 0.5
weight_mutate_rate = 0.8
weight_replace_rate = 0.1
[DefaultSpeciesSet]
compatibility_threshold = 3.0
[DefaultStagnation]
species_fitness_func = max
max_stagnation = 20
species_elitism = 2
[DefaultReproduction]
elitism = 2
survival_threshold = 0.2
from Python NEAT not learning further after a certain point
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