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# 选择下一个城市
def __choice_next_city(self):
next_city = -1
select_citys_prob = [0.0 for i in range(city_num)] #存储去下个城市的概率
total_prob = 0.0
# 获取去下一个城市的概率
for i in range(city_num):
if self.open_table_city[i]:
try :
# 计算概率:与信息素浓度成正比,与距离成反比
select_citys_prob[i] = pow(pheromone_graph[self.current_city][i], ALPHA) * pow((1.0/distance_graph[self.current_city][i]), BETA)
total_prob += select_citys_prob[i]
except ZeroDivisionError as e:
print ('Ant ID: {ID}, current city: {current}, target city: {target}'.format(ID = self.ID, current = self.current_city, target = i))
sys.exit(1)
# 轮盘选择城市
if total_prob > 0.0:
# 产生一个随机概率,0.0-total_prob
temp_prob = random.uniform(0.0, total_prob)
for i in range(city_num):
if self.open_table_city[i]:
# 轮次相减
temp_prob -= se