<p>In <a href="https://github.com/mlpack/mlpack/pull/708#discussion_r71836926">src/mlpack/core/tree/vantage_point_tree/dual_tree_traverser_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +    // Before recursing, we have to set the traversal information correctly.
&gt; +    rule.TraversalInfo() = traversalInfo;
&gt; +    const double rightScore = rule.Score(*queryNode.Right(), referenceNode);
&gt; +    ++numScores;
&gt; +
&gt; +    if (rightScore != DBL_MAX)
&gt; +      Traverse(*queryNode.Right(), referenceNode);
&gt; +    else
&gt; +      ++numPrunes;
&gt; +  }
&gt; +  else if (queryNode.IsLeaf() &amp;&amp; (!referenceNode.IsLeaf()))
&gt; +  {
&gt; +    // If the reference node contains a point we should calculate all
&gt; +    // base cases with this point.
&gt; +    if (referenceNode.IsFirstPointCentroid())
</pre>
<p>If the reference node contains a point we have to calculate all base cases.</p>

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