<p>In <a href="https://github.com/mlpack/mlpack/pull/700#discussion_r69978527">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>> @@ -822,13 +861,13 @@ void LSHSearch<SortPolicy>::Search(const arma::mat& querySet,
>
> // An informative book-keeping for the number of neighbor candidates
> // returned on average.
> + // Make atomic to avoid race conditions when multiple threads are running
> + #pragma omp atomic
> avgIndicesReturned += refIndices.n_elem;
</pre>
<p>Could we use a reduction here in the parallel for definition? i.e. <code>reduction(+,avgIndicesReturned)</code>. Then you wouldn't need an atomic here. It might speed things up (not sure how much).</p>
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