Warning: do not use this function from multiple threads as it advances the file descriptor

r"""Applies the Scaled Exponential Linear Unit. .. math:: \text{selu}(x) = \begin{cases} \lambda x & \text{if } x > 0 \\

Mark the array as a tracer array (true) or not.

The array's position in the sibling list. */

r"""Applies the Sigmoid Linear Unit. Also known as Swish. Applies :math:`x \sigma(x)` element wise, where :math:`\sigma(\cdot)` is the logist