<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'>&gt; +
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +void StructuredForests&lt;MatType, CubeType&gt;::
&gt; +dt_2d(MatType&amp; im)
&gt; +{
&gt; +  arma::vec f(std::max(im.n_rows, im.n_cols));
&gt; +  // transform along columns
&gt; +  for (size_t x = 0; x &lt; im.n_cols; ++x)
&gt; +  {
&gt; +    f.subvec(0, im.n_rows - 1) = im.col(x);
&gt; +    arma::vec d = this-&gt;dt_1d(f, im.n_rows);
&gt; +    im.col(x) = d;
&gt; +  }
&gt; +
&gt; +  // transform along rows
&gt; +  for (int y = 0; y &lt; 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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