<p>In <a href="https://github.com/mlpack/mlpack/pull/746#discussion_r75062615">src/mlpack/core/tree/binary_space_tree/ub_tree_split_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +}
&gt; +
&gt; +template&lt;typename BoundType, typename MatType&gt;
&gt; +bool UBTreeSplit&lt;BoundType, MatType&gt;::SplitNode(BoundType&amp; bound,
&gt; +                                                MatType&amp; data,
&gt; +                                                const size_t begin,
&gt; +                                                const size_t count,
&gt; +                                                size_t&amp; splitCol,
&gt; +                                                std::vector&lt;size_t&gt;&amp; oldFromNew)
&gt; +{
&gt; +  constexpr size_t order = sizeof(AddressElemType) * CHAR_BIT;
&gt; +  if (begin == 0 &amp;&amp; count == data.n_cols)
&gt; +  {
&gt; +    InitializeAddresses(data);
&gt; +
&gt; +    std::sort(addresses.begin(), addresses.end(),ComparePair);
</pre>
<p>This is a minor issue; there is a space missing between <code>addresses.end(),</code> and <code>ComparePair</code>. :)</p>

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