<p>In <a href="https://github.com/mlpack/mlpack/pull/746#discussion_r76271944">src/mlpack/core/tree/binary_space_tree/ub_tree_split_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +      size_t oldI = newToOld[i];
&gt; +      size_t newIndex = newFromOld[index];
&gt; +
&gt; +      data.swap_cols(i, newFromOld[index]);
&gt; +
&gt; +      size_t tmp = newFromOld[index];
&gt; +      newFromOld[index] = i;
&gt; +      newFromOld[oldI] = tmp;
&gt; +
&gt; +      tmp = newToOld[i];
&gt; +      newToOld[i] = newToOld[newIndex];
&gt; +      newToOld[newIndex] = tmp;
&gt; +
&gt; +      tmp = oldFromNew[i];
&gt; +      oldFromNew[i] = oldFromNew[newIndex];
&gt; +      oldFromNew[newIndex] = tmp;
</pre>
<p>Yeah; First time I had used <code>oldFromNew</code> instead of <code>newToOld</code>. But then I had thought that the dataset can be rearranged before the tree construction (that never happens right now).</p>

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