<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66461709">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>> +
> +template<typename MatType, typename CubeType>
> +void StructuredForests<MatType, CubeType>::
> +dt_2d(MatType& im)
> +{
> + arma::vec f(std::max(im.n_rows, im.n_cols));
> + // transform along columns
> + for (size_t x = 0; x < im.n_cols; ++x)
> + {
> + f.subvec(0, im.n_rows - 1) = im.col(x);
> + arma::vec d = this->dt_1d(f, im.n_rows);
> + im.col(x) = d;
> + }
> +
> + // transform along rows
> + for (int y = 0; y < im.n_rows; y++)
</pre>
<p>I guess this line would emit warning(compare with unsigned and signed, change y to size_t or uword may solve this problem, I remember rcurtin prefer size_t since it is a standard way to store the size of array)</p>
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