<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66456300">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  p_size: size of image patches
&gt; +  n_cell: number of self similarity cells
&gt; +  n_orient: number of orientations per gradient scale
&gt; +  */
&gt; +  arma::vec P(2);
&gt; +  int shrink, p_size, n_cell;
&gt; +  shrink = this-&gt;options[&quot;shrink&quot;];
&gt; +  p_size = this-&gt;options[&quot;p_size&quot;];
&gt; +  n_cell = this-&gt;options[&quot;n_cell&quot;];
&gt; +
&gt; +  /*
&gt; +  n_color_ch: number of color channels
&gt; +  n_grad_ch: number of gradient channels
&gt; +  n_ch: total number of channels
&gt; +  */
&gt; +  int n_color_ch, n_grad_ch, n_ch;
</pre>
<p>same here, we can delay the definition of n_ch</p>

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