<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68645742">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; -  arma::rowvec hashVec = secondHashWeights.t() * arma::floor(allProjInTables);
&gt; +    queryCodesNotFloored.unsafe_col(i) = projections.slice(i).t() * queryPoint;
&gt; +  queryCodesNotFloored += offsets.cols(0, numTablesToSearch - 1);
&gt; +  allProjInTables = arma::floor(queryCodesNotFloored/hashWidth);
&gt; +
&gt; +
&gt; +  // Use hashMat to store the primary probing codes and any additional codes
&gt; +  // from multiprobe LSH.
&gt; +  arma::Mat&lt;size_t&gt; hashMat;
&gt; +  hashMat.set_size(T + 1, numTablesToSearch);
&gt; +
&gt; +  // Compute the primary hash value of each key of the query into a bucket of
&gt; +  // the secondHashTable using the secondHashWeights.
&gt; +  hashMat.row(0) = 
&gt; +    arma::conv_to&lt; arma::Row&lt;size_t&gt; &gt;:: // floor by typecasting to size_t
&gt; +    from( secondHashWeights.t() * allProjInTables );
</pre>
<p>I think this could fit a bit more concisely on one (or probably two) lines; there's no need for the spaces between the <code>&lt;&gt;</code> and there are extra spaces after <code>from(</code> and before the closing <code>);</code>.</p>

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