优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
"Numbers have plummeted due to a myriad of different factors including over-abstraction, habitat degradation, pollution, impacts on redds, in-stream barriers, climate change, and pressures associated within the marine environment."，更多细节参见heLLoword翻译官方下载
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self.config.sleep_max，详情可参考下载安装 谷歌浏览器 开启极速安全的 上网之旅。