First-order derivative of the Softsign Function
Calculate the first derivative φ'(x) of the Softsign Function.
The Softsign Function is used in neural networks as an activation function, among other applications.
| \( \normalsize Softsign\ function\ \phi (x)\\ \normalsize \phi (x) = \large \frac{x}{1+|x|} \\ \normalsize \phi ' (x) = \large \frac{1}{(1+|x|)^2} \\ \) |
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