<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68644835">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>> +
> + // Now, find location of second smallest score and generate one more vector.
> + // The second perturbation vector still can't comprise of more than one
> + // change in the bin codes, because of the way perturbation vectors
> + // are generated: First we create the one with the smallest score (Ao) and
> + // then we either add 1 extra dimension to it (Ae) or shift it by one (As).
> + // Since As contains the second smallest score, and Ae contains both the
> + // smallest and the second smallest, it's obvious that score(Ae) >
> + // score(As). Therefore the second perturbation vector is ALWAYS the vector
> + // containing only the second-lowest scoring perturbation.
> +
> + double minscore2 = scores[0];
> + size_t minloc2 = 0;
> + for (size_t s = 0; s < (2 * numProj); ++s) // here we can't start from 1
> + {
> + if ( minscore2 > scores[s] && s != minloc) //second smallest
</pre>
<p>Extra space after opening parenthesis.</p>
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