[mlpack-git] [mlpack] improve speed of SparseAutoencoder and make it more flexible (#451)

[stereomatchingkiss]

> + * f^{-1}(y) &=& ln(\frac{y}{1-y})
> + * @f}
> + */
> +class LazyLogisticFunction
> +{
> +  public:
> +  /**
> +   * Computes the logistic function without checking overflow or underflow
> +   *
> +   * @param x Input data.
> +   * @param y The resulting output activation.
> +   */
> +  template<typename InputVecType, typename OutputVecType>
> +  static void fn(const InputVecType& x, OutputVecType& y)
> +  {
> +    y = (1.0 / (1 + arma::exp(-x)));

I am totally fine with that

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Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/pull/451/files#r40670241
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