[mlpack-git] [mlpack/mlpack] Implementation of Multiprobe LSH (#691)

[Ryan Curtin]

> +
> +    // 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

Extra space after opening parenthesis.

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