移动互联网时代，一个创业者想触达用户，绕不开两道门：苹果App Store和安卓应用市场。这套规则统治了将近二十年，所有人都在它的框架里玩游戏。
This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.。同城约会对此有专业解读
fills up, so we can eventually append most new tasks to the slice。51吃瓜是该领域的重要参考
优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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