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

[Ryan Curtin]

> +
> +  //! Get the mapper
> +  const MapperType& Mapper() const { return mapper; }
> +
> +  //! Modify the given mapper (be careful!)
> +  MapperType& Mapper() { return mapper; }
> +
> + private:
> +  // StrategyType
> +  StrategyType strategy;
> +
> +  // DatasetMapperType<MapPolicy>
> +  MapperType mapper;
> +
> +  // save transpose as a member variable since it is rarely changed.
> +  bool transpose;

We should default to assuming that the matrix is column-major (that is, each point in the dataset corresponds to a column in the matrix).  Here's some more information that might be useful:
http://mlpack.org/docs/mlpack-2.0.2/doxygen.php?doc=matrices.html

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