<p>In <a href="https://github.com/mlpack/mlpack/pull/703#discussion_r74704185">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +      dis = arma::sqrt(dis);      
&gt; +
&gt; +      // find positive and negative edge locations using mask.
&gt; +      arma::uvec posLoc = arma::find( (dis &lt; gRad) % mask );
&gt; +      arma::uvec negLoc = arma::find( (dis &gt;= gRad) % mask );
&gt; +
&gt; +      // we take a random permutation of posLoc and negLoc.
&gt; +      posLoc = arma::shuffle(posLoc);
&gt; +      negLoc = arma::shuffle(negLoc);
&gt; +
&gt; +      size_t lenLoc = std::min((int) negLoc.n_elem, std::min((int) nPatchesPerGt,
&gt; +                              (int) posLoc.n_elem));
&gt; +      arma::umat loc(lenLoc * 2, 2);
&gt; +
&gt; +      for(size_t i = 0; i &lt; lenLoc; ++i)
&gt; +        loc.row(i) = arma::ind2sub(arma::size(dis.n_rows, dis.n_cols), posLoc(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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