<p>In <a href="https://github.com/mlpack/mlpack/pull/703#discussion_r74704345">src/mlpack/methods/edge_boxes/feature_extraction.hpp</a>:</p>
<pre style='color:#555'>> + * find nC2 differences, for locations in the grid_pos.
> + * @param features n-dimensional points
> + * @param grid_pos locations
> + * @param Output stores differences between features at grid_pos locations
> + */
> + void PDist(const CubeType& features, const arma::uvec& grid_pos,
> + CubeType& Output);
> +
> + /**
> + * Find the index of minimum element in a vector
> + * @param k Vector in which we want to find element
> + * return value index of minimum element
> + */
> + size_t IndexMin(arma::vec& k);
> +
> + size_t Discretize(const MatType& labels, const size_t nClass,
</pre>
<p>Can you add a comment that describes what this function does.</p>
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