Hyperbolic Tanh

$$ \tanh(x) = \frac{\sinh(x)}{\cosh(x)} = \frac{e^{x} - e^{-x}}{e^x + e^{-x}} $$

Hyperbolic tangent

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L Ma (2018). 'Hyperbolic Tanh', Datumorphism, 11 April. Available at: https://datumorphism.leima.is/cards/machine-learning/neural-networks/activation-hyperbolic-tangent/.