<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'>> + {
> + max = mag(i, j, k);
> + MaxVal(i, j) = max;
> + Location(i, j) = k;
> + }
> + }
> + }
> + }
> + return MaxVal;
> +}
> +
> +template<typename MatType, typename CubeType>
> +void StructuredForests<MatType, CubeType>::
> +Gradient(CubeType& InImage,
> + MatType& Magnitude,
> + MatType& Orientation)
</pre>
<pre><code>Gradient(const CubeType& inImage,
MatType& magnitude,
MatType& orientation) const;
</code></pre>
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