优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
“Therefore we cannot comment on where the data ends up”, says Petter Flink.
，更多细节参见雷电模拟器官方版本下载
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韓증시 아직 못믿나…중동전 터지자 외국인 5조원 ‘썰물’。体育直播对此有专业解读
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