<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'>> + // Shift operation on Ai (replace max with max+1).
> + std::vector<bool> As = Ai;
> + if ( perturbationShift(As) && perturbationValid(As, numProj) )
> + // Don't add invalid sets.
> + {
> + perturbationSets.push_back(As); // add shifted set to sets
> + minHeap.push(
> + std::make_pair(
> + perturbationScore(As, scores),
> + perturbationSets.size() - 1)
> + );
> + }
> +
> + // Expand operation on Ai (add max+1 to set).
> + std::vector<bool> Ae = Ai;
> + if ( perturbationExpand(Ae) && perturbationValid(Ae, numProj) )
</pre>
<p>Extra space after the opening parenthesis and before the closing parenthesis.</p>
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