[mlpack-git] [mlpack/mlpack] Spill trees (#747)

[MarcosPividori]

> @@ -375,6 +375,9 @@ inline double NeighborSearchRules<SortPolicy, MetricType, TreeType>::Rescore(
>    if (oldScore == DBL_MAX)
>      return oldScore;
>  
> +  if (oldScore == SortPolicy::BestDistance())
> +    return oldScore;

@rcurtin 
Yes, I completely agree. I added this modification to avoid calculating the bounds as there is no possibility of prunning when score is `0`. I agree that it would be possible to prune when score is 0, but we can't because of `B_2()`.
Updated the code in : https://github.com/mlpack/mlpack/pull/747/commits/e4cf1fd252b710809654515dccc30a299d0380e2


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