Hardtanh is an activation function used for neural networks:
$$ f\left(x\right) = -1 \text{ if } x < - 1 $$ $$ f\left(x\right) = x \text{ if } -1 \leq x \leq 1 $$ $$ f\left(x\right) = 1 \text{ if } x > 1 $$
It is a cheaper and more computationally efficient version of the tanh activation.
Image Source: Zhuan Lan
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