<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66459292">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +#include &quot;feature_extraction.hpp&quot;
&gt; +#include &lt;map&gt;
&gt; +
&gt; +namespace mlpack {
&gt; +namespace structured_tree {
&gt; +
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +StructuredForests&lt;MatType, CubeType&gt;::
&gt; +StructuredForests(const std::map&lt;std::string, int&gt;&amp; inMap)
&gt; +{
&gt; +  this-&gt;options = inMap;
&gt; +}
&gt; +
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +MatType StructuredForests&lt;MatType, CubeType&gt;::
&gt; +LoadData(MatType&amp; images, MatType&amp; boundaries, MatType&amp; segmentations)
</pre>
<p>Looks like the parameters are good candidates of const.</p>

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