<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69916273">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>I'm not sure if it makes sense to include transposition functionality inside the Imputer class... have I overlooked where this might be useful? I think most people will just want to pass in a matrix, have it imputed, and get it back.</p>
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