<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'>> + size_t height, size_t width,
> + MatType& dst);
> +
> + void SepFilter2D(CubeType &InOutImage, const arma::vec& kernel, const size_t radius);
> +
> + void ConvTriangle(CubeType &InImage, const size_t radius);
> +
> + void Gradient(const CubeType& InImage,
> + MatType& Magnitude,
> + MatType& Orientation);
> +
> + void MaxAndLoc(CubeType &mag, arma::umat &Location, MatType& MaxVal) const;
> +
> + void Histogram(const MatType& Magnitude,
> + const MatType& Orientation,
> + 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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