<p>In <a href="https://github.com/mlpack/mlpack/pull/703#discussion_r68421925">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +#include &lt;mlpack/methods/pca/pca.hpp&gt;
&gt; +namespace mlpack {
&gt; +namespace structured_tree {
&gt; +
&gt; +/**
&gt; + * Constructor: stores all the parameters in an object
&gt; + * of feature_parameters class.
&gt; + */
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +StructuredForests&lt;MatType, CubeType&gt;::
&gt; +StructuredForests(FeatureParameters F) 
&gt; +{
&gt; +  params = F; 
&gt; +}
&gt; +
&gt; +/*
</pre>
<p>If we do not need the codes again, I think we can remove it, git will record the codes we removed before</p>

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