<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69967016">src/mlpack/core/data/imputer.hpp</a>:</p>
<pre style='color:#555'>> +
> + //! 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;
</pre>
<p>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:<br>
<a href="http://mlpack.org/docs/mlpack-2.0.2/doxygen.php?doc=matrices.html">http://mlpack.org/docs/mlpack-2.0.2/doxygen.php?doc=matrices.html</a></p>
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