<p>In <a href="https://github.com/mlpack/mlpack/pull/684#discussion_r66614123">src/mlpack/methods/neighbor_search/neighbor_search_rules_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -419,6 +423,8 @@ inline double NeighborSearchRules&lt;SortPolicy, MetricType, TreeType&gt;::
&gt;    queryNode.Stat().SecondBound() = bestDistance;
&gt;    queryNode.Stat().AuxBound() = auxDistance;
&gt;  
&gt; +  worstDistance = SortPolicy::Relax(worstDistance, epsilon);
</pre>
<p>Why not relax bestDistance here too?</p>

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