<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68645804">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>> + queryCodesNotFloored.unsafe_col(i) = projections.slice(i).t() * queryPoint;
> + queryCodesNotFloored += offsets.cols(0, numTablesToSearch - 1);
> + allProjInTables = arma::floor(queryCodesNotFloored/hashWidth);
> +
> +
> + // Use hashMat to store the primary probing codes and any additional codes
> + // from multiprobe LSH.
> + arma::Mat<size_t> hashMat;
> + hashMat.set_size(T + 1, numTablesToSearch);
> +
> + // Compute the primary hash value of each key of the query into a bucket of
> + // the secondHashTable using the secondHashWeights.
> + hashMat.row(0) =
> + arma::conv_to< arma::Row<size_t> >:: // floor by typecasting to size_t
> + from( secondHashWeights.t() * allProjInTables );
> + // mod to compute 2nd-level codes
</pre>
<p>Again I feel really pedantic saying this but if this comment can be a complete sentence it would be more clear. :)</p>
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