[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)
> +{
> +  const int n_queries = LSHneighbors.n_cols;
> +  const int n_neigh = LSHneighbors.n_rows;
> +
> +  int found_same = 0;
> +  for (int q = 0; q < n_queries; ++q)
> +  {
> +    for (int n = 0; n < n_neigh; ++n)

Another minor note: maybe better to use `size_t` here since these will never take negative values?

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