[mlpack-git] [mlpack/mlpack] LSHSearch Parallelization (#700)

[Ryan Curtin]

> +  arma::mat rdata;
> +  arma::mat qdata;
> +  data::Load(trainSet, rdata, true);
> +  data::Load(testSet, qdata, true);
> +
> +  // Where to store neighbors and distances
> +  arma::Mat<size_t> sequentialNeighbors;
> +  arma::Mat<size_t> parallelNeighbors;
> +  arma::mat distances;
> +
> +  // Construct an LSH object. By default, it uses the maximum number of threads
> +  LSHSearch<> lshTest(rdata, numProj, numTables); //default parameters
> +  lshTest.Search(qdata, k, parallelNeighbors, distances);
> +
> +  // Now perform same search but with 1 thread
> +  lshTest.MaxThreads(1);

If you did remove the `MaxThreads()` member from `LSHSearch`, you could easily replicate the same functionality by just calling `omp_set_num_threads(1)` before the second call to `lshTest.Search()`.  (Maybe you would want to restore the original number of threads afterwards for other OpenMP tests.)

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