<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'>&gt; +   * find nC2 differences, for locations in the grid_pos.
&gt; +   * @param features n-dimensional points
&gt; +   * @param grid_pos locations
&gt; +   * @param Output stores differences between features at grid_pos locations
&gt; +   */
&gt; +  void PDist(const CubeType&amp; features, const arma::uvec&amp; grid_pos,
&gt; +             CubeType&amp; Output);
&gt; +
&gt; +  /**
&gt; +   * Find the index of minimum element in a vector
&gt; +   * @param k Vector in which we want to find element
&gt; +   * return value index of minimum element
&gt; +   */
&gt; +  size_t IndexMin(arma::vec&amp; k);
&gt; +
&gt; +  size_t Discretize(const MatType&amp; labels, const size_t nClass,
</pre>
<p>Can you add a comment that describes what this function does.</p>

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