无法理解python遗传算法中的错误
我从YouTube视频中用Python 3.6编写了以下代码,该视频是关于简单遗传算法的教程。我正在努力学习的东西无法理解python遗传算法中的错误,python,python-3.x,genetic-algorithm,Python,Python 3.x,Genetic Algorithm,我从YouTube视频中用Python 3.6编写了以下代码,该视频是关于简单遗传算法的教程。我正在努力学习的东西 from fuzzywuzzy import fuzz import random import string class Agent: def __init__(self,length): #Initialization by using a constructor self.string = ''.join(random.choice(s
from fuzzywuzzy import fuzz
import random
import string
class Agent:
def __init__(self,length): #Initialization by using a constructor
self.string = ''.join(random.choice(string.ascii_letters)for _ in range(length)) # Using random letters to make the initial population
self.fitness = -1
def __str__(self): # Special method to print string and fitness value
return 'String: ' + str(self.string) + ' Fitness: ' + str(self.fitness)
in_str = None
in_str_len = None
population = 20 #20 agents
generations = 1000
def ga(): # For evolving
agents = init_agents(population,in_str_len) # Returns a list of initialized agents
for gen in range(generations):
print('Generation: ' + str(generations))
agents = fitness(agents)
agents = selection(agents)
agents = crossover(agents)
agents = mutation(agents)
if any(agent.fitness >= 90 for agent in agents): # Ends program if agent reaches fitness of 90
print('Threshold reached')
exit()
def init_agents(population,len):
return[Agent(len) for _ in range(population)]
def fitness(agents):
for agent in agents:
agent.fitness = fuzz.ratio(agent.string, in_str) # Gives fuzzy value when comparing agent string to input string
return agent
def selection(agents):
agents = sorted(agents, key=lambda agents: agents.fitness, reverse=True) # Orders agent fitness from largest to smallest because reverse is given as TRUE
print ('\n'.join(map(str,agents)))
agents = agents[:int(0.2 * len(agents))]
return agents
def crossover(agents):
offspring = []
for _ in range(int((population - len(agents))) / 2):
parent1 = random.choice(agents)
parent2 = random.choice(agents)
child1 = Agent(in_str_len)
child2 = Agent(in_str_len)
split = random.randit(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] <= 1.0:
agent.string = agent.string[0:idx] + random.choice(string.ascii_letters) + agent.string[idx+1, in_str_len] # Insert randomly chosen letter for mutation
return agents
if __name__ == '__main__':
in_str = 'TargetWord'
in_str_len = len(in_str)
ga()
从fuzzyfuzzy导入fuzz
随机输入
导入字符串
类代理:
def uu init uu(self,length):#使用构造函数初始化
self.string=''.join(random.choice(string.ascii_字母)表示uu范围内(长度))35;使用随机字母进行初始填充
self.fitness=-1
def _str _(self):#打印字符串和适应值的特殊方法
返回'String:'+str(self.String)+'Fitness:'+str(self.Fitness)
in_str=无
in_str_len=无
人口=20人#20人
世代=1000
def ga():#用于进化
agents=init_agents(填充,在_str_len中)#返回初始化代理的列表
对于范围内的发电机(代):
打印('Generation:'+str(generations))
代理=健身(代理)
代理=选择(代理)
代理=交叉(代理)
代理=突变(代理)
如果有(代理中的代理的agent.fitness>=90):#如果代理的适应度达到90,则结束计划
打印('已达到阈值')
退出()
def初始代理(人口,len):
返回[范围内(总体)的代理(len)]
def健身(代理):
对于代理中的代理:
agent.fitness=fuzz.ratio(agent.string,in_str)#在比较代理字符串和输入字符串时给出模糊值
退货代理
def选择(代理):
agents=排序(agents,key=lambda agents:agents.fitness,reverse=True)#将agent fitness从最大到最小排序,因为reverse为True
打印('\n'.join(映射(str,代理)))
代理=代理[:int(0.2*len(代理))]
退货代理
def交叉(代理):
后代=[]
对于范围内的(int((总体-len(代理))/2):
parent1=随机选择(代理)
parent2=随机选择(代理)
child1=代理(在str中)
child2=代理(按顺序)
split=random.randit(0,单位长度)
child1.string=parent1.string[0:split]+parent2.string[split:in\u str\u len]
child2.string=parent2.string[0:split]+parent1.string[split:in\u str\u len]
子代。追加(child1)
子代。追加(child2)
代理。扩展(后代)
退货代理
def突变(代理):
对于代理中的代理:
对于idx,枚举中的参数(agent.string):
如果random.uniform[0.0,1.0]您的fitness
函数只返回一个代理,而不是列表。将单个结果传递给选择
函数,该函数需要一个列表
File "C:/Users/admin/simple_ga.py", line 69, in <module>
ga()
File "C:/Users/admin/simple_ga.py", line 23, in ga
agents = selection(agents)
File "C:/Users/admin/simple_ga.py", line 39, in selection
agents = sorted(agents, key=lambda agents: agents.fitness, reverse=True) # Orders agent fitness from largest to smallest because reverse is given as TRUE
TypeError: 'Agent' object is not iterable