<p>In <a href="https://github.com/mlpack/mlpack/pull/663#discussion_r65260483">src/mlpack/methods/lsh/lsh_search.hpp</a>:</p>
<pre style='color:#555'>&gt;     */
&gt;    void Train(const arma::mat&amp; referenceSet,
&gt;               const size_t numProj,
&gt;               const size_t numTables,
&gt;               const double hashWidth = 0.0,
&gt;               const size_t secondHashSize = 99901,
&gt; -             const size_t bucketSize = 500);
&gt; +             const size_t bucketSize = 500,
&gt; +             const std::vector&lt;arma::mat&gt; &amp;projection
&gt; +             = std::vector&lt;arma::mat&gt;()
</pre>
<p>I don't see any reason not to, since the number of tables doesn't change for the duration of the object.</p>

<p>I think I can do that tomorrow if you are busy, shouldn't be much trouble :)</p>

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