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Softplus Function

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Calculates the Softplus Function φ(x).
The Softplus Function is used in applications such as activation functions for neural networks.
x
\( \normalsize Softplus\ function\ \phi (x)\\ \normalsize \phi (x) = \large \ln(1+e^x) \\ \normalsize \phi ' (x) = \large \frac{1}{1+e^{-x}} \\ \)
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