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Computes the SiLU or Swish activation function: x * sigmoid(x).

The SiLU activation function was introduced in "Gaussian Error Linear Units (GELUs)" Hendrycks et al. 2016 and "Sigmoid-Weighted Linear Units for Neural Network Function Approximation in Reinforcement Learning" Elfwing et al. 2017 and was independently discovered (and called swish) in "Searching for Activation Functions" Ramachandran et al. 2017

features A Tensor representing preactivation values.

The activation value.