[mlpack-git] [mlpack/mlpack] Issue261/lsh test (#605)

[Ryan Curtin]

>  
>  using namespace std;
>  using namespace mlpack;
>  using namespace mlpack::neighbor;
>  
> +double compute_recall(
> +    arma::Mat<size_t> LSHneighbors, 
> +    arma::Mat<size_t> groundTruth)

It's probably better to use const references here: `const arma::Mat<size_t>&` not `arma::Mat<size_t>`.  That will help avoid a copy.

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