我今天遇到这种表示法
本教程在这里:https://towardsdatascience.com/genetic-algorithm-implementation-in-python-5ab67bb124a6
parent1_idx = k%parents.shape[0]
右侧将返回什么?
这种表达的名字是什么?
提前致谢 !
最佳答案
我在提到的文章的这段代码中看到了这一行:
for k in range(offspring_size[0]):
# Index of the first parent to mate.
parent1_idx = k%parents.shape[0]
# Index of the second parent to mate.
parent2_idx = (k+1)%parents.shape[0]
其中
parents
定义如下:parents = numpy.empty((num_parents, pop.shape[1]))
for parent_num in range(num_parents):
max_fitness_idx = numpy.where(fitness == numpy.max(fitness))
max_fitness_idx = max_fitness_idx[0][0]
parents[parent_num, :] = pop[max_fitness_idx, :]
fitness[max_fitness_idx] = -99999999999
return parents
从上面的两行中,很明显
k
和parents.shape[0]
都是整数,因此这行是两个数值变量之间的简单modulo operator:a = b % c
。