优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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"We get a lot of people saying, 'I don't have a problem dealing with people'. And then they realise that they are not comfortable sharing spaces with other people.，这一点在服务器推荐中也有详细论述
The city’s police department has released images of three other people it is seeking in connection with the snowball fight. Police Commissioner Jessica Tisch has called the treatment of officers at the fight “disgraceful” and “criminal.”
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