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

[Ryan Curtin]

> +    {
> +      // get the perturbation set corresponding to the minimum score
> +      Ai = perturbationSets[ minHeap.top().second ];
> +      minHeap.pop(); // .top() returns, .pop() removes
> +
> +
> +      // modify Ai (shift)
> +      std::vector<size_t> As = Ai;
> +      perturbationShift(As);
> +      if ( perturbationValid(As, numProj) )
> +      {
> +        perturbationSets.push_back(As); // add shifted set to sets
> +        std::pair<double, size_t> shifted(
> +            perturbationScore(As, scores),
> +            perturbationSets.size() - 1); // (score, position) pair for shift
> +        minHeap.push(shifted);

Consider also using `make_pair`:

```
minHeap.push(std::make_pair(perturbationScore(As, scores), perturbationSets.size() - 1));
```

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