<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69915517">src/mlpack/core/data/imputer.hpp</a>:</p>
<pre style='color:#555'>> + //"IncrementPolicy");
> + }
> +
> + /**
> + * Given an input dataset, replace missing values with given imputation
> + * strategy.
> + *
> + * @param input Input dataset to apply imputation.
> + * @param output Armadillo matrix to save the results
> + * @oaran missingValue User defined missing value; it can be anything.
> + * @param dimension Dimension to apply the imputation.
> + */
> + void Impute(const arma::Mat<T>& input,
> + arma::Mat<T>& output,
> + const std::string& missingValue,
> + const size_t dimension)
</pre>
<p>I think that many times the user will want to impute without copying the matrix; this will especially make a difference when the matrix is large. Should we also provide an overload with just one matrix that will be modified?</p>
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