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

[Keon Kim]

> +              const std::string& missingValue,
> +              const size_t dimension)
> +  {
> +    T mappedValue = static_cast<T>(mapper.UnmapValue(missingValue, dimension));
> +    strategy.Impute(input, output, mappedValue, dimension, transpose);
> +  }
> +
> +  /**
> +  * This overload of Impute() lets users to define custom value that can be
> +  * replaced with the target value.
> +  */
> +  void Impute(const arma::Mat<T>& input,
> +              arma::Mat<T>& output,
> +              const std::string& missingValue,
> +              const T& customValue,
> +              const size_t dimension)

I think this is a good idea. I'll update this.

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