sigmoid or tanh？

Sigmoid outputs a value between 0 and 1 which makes it a very good choice for binary classification.
You can classify as 0 if the output is less than 0.5 and classify as 1 if the output is more than 0.5.
It can be done with tanh as well but it is less convenient as the output is between -1 and 1.(Sigmoid
输出的值介于 0 和 1 之间，这使其成为二元分类的一个非常好的选择。如果输出小于 0.5，则可以将其归类为 0，如果输出
大于 0.5，则归类为 1。它也可以用 tanh 来完成，但是它不太方便，因为输出在
-1 和 1 之间。)