<p>In <a href="https://github.com/mlpack/mlpack/pull/703#discussion_r68431312">src/mlpack/methods/edge_boxes/feature_extraction.hpp</a>:</p>
<pre style='color:#555'>&gt; +                          size_t height, size_t width,
&gt; +                          MatType&amp; dst);
&gt; +  
&gt; +  void SepFilter2D(CubeType &amp;InOutImage, const arma::vec&amp; kernel, const size_t radius);
&gt; +
&gt; +  void ConvTriangle(CubeType &amp;InImage, const size_t radius);
&gt; +
&gt; +  void Gradient(const CubeType&amp; InImage, 
&gt; +         MatType&amp; Magnitude,
&gt; +         MatType&amp; Orientation);
&gt; +
&gt; +  void MaxAndLoc(CubeType &amp;mag, arma::umat &amp;Location, MatType&amp; MaxVal) const;
&gt; +
&gt; +  void Histogram(const MatType&amp; Magnitude,
&gt; +            const MatType&amp; Orientation, 
&gt; +            size_t downscale, size_t interp,
</pre>
<p>Do you forgot const?const size_t downscale, const size_t interp?</p>

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