<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r67987417">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>> +
> +
> + // define a priority queue with CompareGreater as a minheap
> + std::priority_queue<
> + std::pair<double, size_t>, // contents: pairs of (score, index)
> + std::vector< // container: vector of pairs
> + std::pair<double, size_t>
> + >,
> + mlpack::neighbor::CompareGreater // comparator of pairs(compare scores)
> + > minHeap; // our minheap
> +
> + // Start by adding the lowest scoring set to the minheap
> + std::pair<double, size_t> pair0( perturbationScore(Ao, scores), 0 );
> + minHeap.push(pair0);
> +
> + double prevScore = 0; // store score of smallest inserted vector (for assert)
</pre>
<p>If this variable is here just for an assert, then I think once the tests show the algorithm is working then we can remove this.</p>
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