优点：计算简单，导数恒为1（正区间），缓解梯度消失
"When you go around research labs, or you talk to start-ups, they have really good sensors, and then you ask them how long they work. They say 'six months'. That's great for R&D... but in industry, I want this robot to work for 10 years," he says.，这一点在快连下载安装中也有详细论述
* Read this file again after each context compaction.，详情可参考im钱包官方下载
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