[mlpack-git] [mlpack/mlpack] DatasetMapper & Imputer (#694)

[stereomatchingkiss]

> +   * @param dimension
> +   * @param index
> +   * @param transpose
> +   */
> +  template <typename MatType>
> +  void Impute(const MatType &input,
> +              MatType &output,
> +              const size_t dimension,
> +              const size_t index,
> +              const bool transpose = true)
> +  {
> +    if (transpose)
> +    {
> +      // TODO: The mean must be calculated
> +      // without NaN or target missing variable.
> +      MatType meanMat = arma::mean(input, 1);

I think we can store the mean in the class, this way we do not need to recalculate the mean over and over.
We can store the mapper to help us filter out what are the NaN or target missing variable too.

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