优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
Three of the images are inspired by the Necker cube, a two-dimensional drawing of a cube that can be understood in two ways: either with the bottom left face at the front, or the top right face at the front. Once your eyes settle on one interpretation, it is hard to see the other.，详情可参考91视频
A mobile version of Pokémon Champions will also be released later this year.。safew官方版本下载对此有专业解读
Bootstrapped vs. Hosted，这一点在雷电模拟器官方版本下载中也有详细论述
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