<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69805820">src/mlpack/core/data/imputation_methods/mean_imputation.hpp</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,96 @@
> +/**
> + * @file mean_imputation.hpp
> + * @author Keon Kim
> + *
> + * Definition and Implementation of the MeanImputation class.
> + */
> +#ifndef MLPACK_CORE_DATA_IMPUTE_STRATEGIES_MEAN_IMPUTATION_HPP
> +#define MLPACK_CORE_DATA_IMPUTE_STRATEGIES_MEAN_IMPUTATION_HPP
> +
> +#include <mlpack/core.hpp>
> +#include <cmath>
</pre>
<p><code>cmath</code> is already included in <code>prereqs.hpp</code>.</p>
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