find for a factory, there were several utilities that did things along
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，这一点在传奇私服新开网｜热血传奇SF发布站｜传奇私服网站中也有详细论述
优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
Тысячи человек привезут в Россию из ОАЭ и Омана19:40。博客对此有专业解读