<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r67985938">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +    hashMat.zeros(T, numTablesToSearch);
&gt; +
&gt; +    for (size_t i = 0; i &lt; numTablesToSearch; ++i)
&gt; +    {
&gt; +      // construct this table&#39;s probing sequence of length T
&gt; +      arma::mat additionalProbingBins;
&gt; +      //arma::vec dummyBins;
&gt; +      //dummyBins.zeros(T, 1);
&gt; +      GetAdditionalProbingBins(allProjInTables.unsafe_col(i),
&gt; +                                queryCodesNotFloored.unsafe_col(i),
&gt; +                                T,
&gt; +                                additionalProbingBins);
&gt; +
&gt; +      // map the probing bin to second hash table bins
&gt; +      hashMat.col(i) = additionalProbingBins.t() * secondHashWeights;
&gt; +      //hashMat.col(i) = dummyBins;
</pre>
<p>You can probably remove the commented out debugging code :)</p>

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