如果我在列表中有一组项目.我想根据另一个权重列表从该列表中进行选择.
例如我的收藏是['one', 'two', 'three']和权重[0.2, 0.3, 0.5],我希望这个方法在所有抽奖的大约一半中给我'三'.
最简单的方法是什么？
I regularly find myself in the position of needing a random index to an array or a list, where the probabilities of indices are not uniformly distributed, but according to certain positive weights. What's a fast way to obtain them? I know I can pass weights to numpy.random.choice as optional argument p, but the function seems quite slow, and building an arange to pass it is not ideal either. The sum of weights can be an arbitrary positive number …