<p>In <a href="https://github.com/mlpack/mlpack/pull/708#discussion_r71837556">src/mlpack/core/tree/vantage_point_tree/single_tree_traverser_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +SingleTreeTraverser&lt;RuleType&gt;::Traverse(
&gt; +    const size_t queryIndex,
&gt; +    VantagePointTree&lt;MetricType, StatisticType, MatType, BoundType, SplitType&gt;&amp;
&gt; +        referenceNode)
&gt; +{
&gt; +  // If we are a leaf, run the base case as necessary.
&gt; +  if (referenceNode.IsLeaf())
&gt; +  {
&gt; +    const size_t refEnd = referenceNode.Begin() + referenceNode.Count();
&gt; +    for (size_t i = referenceNode.Begin(); i &lt; refEnd; ++i)
&gt; +      rule.BaseCase(queryIndex, i);
&gt; +    return;
&gt; +  }
&gt; +
&gt; +  // If the reference node contains a point we should calculate the base case.
&gt; +  if (referenceNode.IsFirstPointCentroid())
</pre>
<p>If the reference node contains a point we have to calculate the base case.</p>

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