<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68645280">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +      // Shift operation on Ai (replace max with max+1).
&gt; +      std::vector&lt;bool&gt; As = Ai;
&gt; +      if ( perturbationShift(As) &amp;&amp; perturbationValid(As, numProj) )
&gt; +        // Don&#39;t add invalid sets.
&gt; +      {
&gt; +        perturbationSets.push_back(As); // add shifted set to sets
&gt; +        minHeap.push( 
&gt; +            std::make_pair(
&gt; +              perturbationScore(As, scores), 
&gt; +              perturbationSets.size() - 1)
&gt; +            );
&gt; +      }
&gt; +
&gt; +      // Expand operation on Ai (add max+1 to set).
&gt; +      std::vector&lt;bool&gt; Ae = Ai;
&gt; +      if ( perturbationExpand(Ae) &amp;&amp; perturbationValid(Ae, numProj) ) 
</pre>
<p>Extra space after the opening parenthesis and before the closing parenthesis.</p>

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