<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'>> + p_size: size of image patches
> + n_cell: number of self similarity cells
> + n_orient: number of orientations per gradient scale
> + */
> + arma::vec P(2);
> + int shrink, p_size, n_cell;
> + shrink = this->options["shrink"];
> + p_size = this->options["p_size"];
> + n_cell = this->options["n_cell"];
> +
> + /*
> + n_color_ch: number of color channels
> + n_grad_ch: number of gradient channels
> + n_ch: total number of channels
> + */
> + 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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