<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'>> + return AssignToSecondTree;
> +
> + return SplitRequired;
> + }
> +
> + /**
> + * Return the maximum bounding rectangle of the node.
> + * This method should always return the bound that is used for the
> + * desicion-making in GetSplitPolicy().
> + *
> + * @param node The node whose bound is requested.
> + */
> + template<typename TreeType>
> + static const
> + bound::HRectBound<metric::EuclideanDistance, typename TreeType::ElemType>&
> + Bound(const TreeType& 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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