<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66463377">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>> + = InImage.slice(i).col(left - 1 - j);
> + }
> +
> + for(int j = 0; j < top; j++)
> + {
> +
> + OutImage.slice(i).row(j)
> + = OutImage.slice(i).row(2 * top - 1 - j);
> + }
> +
> + for(int j = 0; j < bottom; j++)
> + {
> + OutImage.slice(i).row(InImage.n_rows + top + j)
> + = OutImage.slice(i).row(InImage.n_rows + top - j - 1);
> + }
> +
</pre>
<p>same here, if possible, please use size_t</p>
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