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simple-ga.py
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simple-ga.py
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from fuzzywuzzy import fuzz
import random
import string
class Agent:
def __init__(self, length):
self.string = ''.join(random.choice(string.letters) for _ in xrange(length))
self.fitness = -1
def __str__(self):
return 'String: ' + str(self.string) + ' Fitness: ' + str(self.fitness)
in_str = None
in_str_len = None
population = 20
generations = 10000
def ga():
agents = init_agents(population, in_str_len)
for generation in xrange(generations):
print 'Generation: ' + str(generation)
agents = fitness(agents)
agents = selection(agents)
agents = crossover(agents)
agents = mutation(agents)
if any(agent.fitness >= 90 for agent in agents):
print 'Threshold met!'
exit(0)
def init_agents(population, length):
return [Agent(length) for _ in xrange(population)]
def fitness(agents):
for agent in agents:
agent.fitness = fuzz.ratio(agent.string, in_str)
return agents
def selection(agents):
agents = sorted(agents, key=lambda agent: agent.fitness, reverse=True)
print '\n'.join(map(str, agents))
agents = agents[:int(0.2 * len(agents))]
return agents
def crossover(agents):
offspring = []
for _ in xrange((population - len(agents)) / 2):
parent1 = random.choice(agents)
parent2 = random.choice(agents)
child1 = Agent(in_str_len)
child2 = Agent(in_str_len)
split = random.randint(0, in_str_len)
child1.string = parent1.string[0:split] + parent2.string[split:in_str_len]
child2.string = parent2.string[0:split] + parent1.string[split:in_str_len]
offspring.append(child1)
offspring.append(child2)
agents.extend(offspring)
return agents
def mutation(agents):
for agent in agents:
for idx, param in enumerate(agent.string):
if random.uniform(0.0, 1.0) <= 0.1:
agent.string = agent.string[0:idx] + random.choice(string.letters) + agent.string[idx+1:in_str_len]
return agents
if __name__ == '__main__':
in_str = 'TroySquillaci'
in_str_len = len(in_str)
ga()