<p>In <a href="https://github.com/mlpack/mlpack/pull/699#discussion_r69029365">src/mlpack/core/tree/rectangle_tree/r_plus_plus_tree_split_policy.hpp</a>:</p>
<pre style='color:#555'>&gt; +      return AssignToSecondTree;
&gt; +
&gt; +    return SplitRequired;
&gt; +  }
&gt; +
&gt; +  /**
&gt; +   * Return the maximum bounding rectangle of the node.
&gt; +   * This method should always return the bound that is used for the
&gt; +   * desicion-making in GetSplitPolicy().
&gt; +   *
&gt; +   * @param node The node whose bound is requested.
&gt; +   */
&gt; +  template&lt;typename TreeType&gt;
&gt; +  static const
&gt; +      bound::HRectBound&lt;metric::EuclideanDistance, typename TreeType::ElemType&gt;&amp;
&gt; +          Bound(const TreeType&amp; node)
</pre>
<p>I am not sure since <code>RPlusTreeSplitPolicy::Bound()</code> returns the minimum bounding rectangle. This method is used in <code>SweepType</code> to determine candidates for partitioning.</p>

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