<p>In <a href="https://github.com/mlpack/mlpack/pull/696#discussion_r67211173">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +      //dis.elem( arma::find(dis &gt;= g_rad) ).zeros();
&gt; +      //dis2.elem( arma::find(dis &lt; g_rad) ).zeros();
&gt; +      
&gt; +
&gt; +      arma::uvec pos_loc = arma::find( (dis &lt; g_rad) % mask );
&gt; +      arma::uvec neg_loc = arma::find( (dis &gt;= g_rad) % mask );
&gt; +
&gt; +      pos_loc = arma::shuffle(pos_loc);
&gt; +      neg_loc = arma::shuffle(neg_loc);
&gt; +
&gt; +      arma::umat loc(n_patches_per_gt * 2, 2);
&gt; +      //cout &lt;&lt; &quot;pos_loc size: &quot; &lt;&lt; arma::size(pos_loc) &lt;&lt; &quot; neg_loc size: &quot; &lt;&lt; arma::size(neg_loc) &lt;&lt; endl;
&gt; +      //cout &lt;&lt; &quot;n_patches_per_gt = &quot; &lt;&lt; n_patches_per_gt &lt;&lt; endl;
&gt; +      for(size_t i = 0; i &lt; n_patches_per_gt; ++i)
&gt; +      {
&gt; +        loc.row(i) = arma::ind2sub(arma::size(dis.n_rows, dis.n_cols), pos_loc(i) ).t();
</pre>
<p>Do you think, we could store the location in the columns, in this case we don't have to transpose the locations vector.</p>

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