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tf激活函数.md

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##激活函数

1.relu
max(x, 0)

2.relu6
min(max(x, 0), 6)
对relu做最大值的约束

3.softplus
log(exp(x) + 1)

4.sigmoid
y = 1 / (1 + exp(-x))

5.tanh
y = (exp(x)-exp(-x))/(exp(x)+exp(-x))