<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'>&gt; +      = InImage.slice(i).col(left - 1 - j);
&gt; +    }
&gt; +
&gt; +    for(int j = 0; j &lt; top; j++)
&gt; +    {
&gt; +
&gt; +      OutImage.slice(i).row(j)
&gt; +      = OutImage.slice(i).row(2 * top - 1 - j);
&gt; +    }
&gt; +     
&gt; +    for(int j = 0; j &lt; bottom; j++)
&gt; +    {
&gt; +      OutImage.slice(i).row(InImage.n_rows + top + j)
&gt; +      = OutImage.slice(i).row(InImage.n_rows + top - j - 1);
&gt; +    }
&gt; +
</pre>
<p>same here, if possible, please use size_t</p>

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