<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66488524">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +        {
&gt; +          max = mag(i, j, k);
&gt; +          MaxVal(i, j) = max;
&gt; +          Location(i, j) = k;
&gt; +        }
&gt; +      }
&gt; +    }
&gt; +  }
&gt; +  return MaxVal;
&gt; +}
&gt; +
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +void StructuredForests&lt;MatType, CubeType&gt;::
&gt; +Gradient(CubeType&amp; InImage, 
&gt; +         MatType&amp; Magnitude,
&gt; +         MatType&amp; Orientation)
</pre>
<pre><code>Gradient(const CubeType&amp; inImage, 
              MatType&amp; magnitude,
             MatType&amp; orientation) const;
</code></pre>

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