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ga1.py
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ga1.py
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import random
import string
from fuzzywuzzy import fuzz
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 = 20000
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,in_str_len):
return [Agent(in_str_len) 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))
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 = parent1.string[split:in_str_len]+parent2.string[0:split]
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(0.0,0.1) <= 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 = 'RahulSharma'
in_str_len=len(in_str)
ga()