<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r68354477">src/mlpack/core/data/imputation_methods/mean_imputation.hpp</a>:</p>
<pre style='color:#555'>> + * A simple mean imputation
> + */
> +template <typename T>
> +class MeanImputation
> +{
> + public:
> + void Apply (const arma::Mat<T>& input,
> + arma::Mat<T>& output,
> + const T& mappedValue,
> + const size_t dimension,
> + const bool transpose = true)
> + {
> + // initiate output
> + output = input;
> +
> + double sum;
</pre>
<p>forgot to initialize sum to 0?</p>
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