<p>In <a href="https://github.com/mlpack/mlpack/pull/746#discussion_r76268908">src/mlpack/core/tree/binary_space_tree/ub_tree_split.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +template&lt;typename BoundType, typename MatType = arma::mat&gt;
&gt; +class UBTreeSplit
&gt; +{
&gt; + public:
&gt; +  //! The type of a one-dimensional address.
&gt; +  typedef typename std::conditional&lt;sizeof(typename MatType::elem_type) * CHAR_BIT &lt;= 32,
&gt; +                                    uint32_t,
&gt; +                                    uint64_t&gt;::type AddressElemType;
&gt; +
&gt; +  /**
&gt; +   * This class performs the actual splitting i.e. it reorders the dataset.
&gt; +   * This variable should be equal to true if the class does not perform the
&gt; +   * actual splitting.
&gt; +   */
&gt; +  static constexpr bool NeedRearrangeDataset = false;
</pre>
<p>I don't see this used anywhere; should we remove it?</p>

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