chainer.functions.selu

chainer.functions.selu(x, alpha=1.6732632423543772, scale=1.0507009873554805)

Scaled Exponential Linear Unit function.

For parameters $\alpha$ and $\lambda$, it is expressed as

$$\begin{split}f(x) = \lambda \left \{ \begin{array}{ll} x & {\rm if}~ x \ge 0 \\ \alpha (\exp(x) - 1) & {\rm if}~ x < 0, \end{array} \right.\end{split}$$

See: https://arxiv.org/abs/1706.02515

Parameters

• x (Variable or N-dimensional array) – Input variable. A $(s_1, s_2, ..., s_N)$-shaped float array.

• alpha (float) – Parameter $\alpha$.

• scale (float) – Parameter $\lambda$.

Returns

Output variable. A $(s_1, s_2, ..., s_N)$-shaped float array.

Return type

Variable