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

[Keon Kim]

> +   * @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);

@stereomatchingkiss
Thanks for the comment! 
oh, you're right. I was thinking we can iterate through the dimension here.
What do you mean by store mapper to help us filter out the NaN or target missing variable?
could you clarify this?

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