<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r67987727">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -339,12 +340,301 @@ void LSHSearch&lt;SortPolicy&gt;::BaseCase(const size_t queryIndex,
&gt;          referenceIndex, distance);
&gt;  }
&gt;  
&gt; +
&gt; +// Compare class for &lt;double, size_t&gt; pair, used in GetAdditionalProbingBins.
&gt; +class CompareGreater
&gt; +{
&gt; +  public:
&gt; +    bool operator()(
&gt; +        std::pair&lt;double, size_t&gt; p1,
&gt; +        std::pair&lt;double, size_t&gt; p2){
&gt; +      //only compare the double values
&gt; +      return p1.first &gt; p2.first;
&gt; +    }
</pre>
<p>Are you sure <code>std::greater</code> will not work here instead of this class?  By default for <code>std::pair</code> that will take into account the second element, but I think that in your case ordering based on the second element doesn't really matter.</p>

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