<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68646696">src/mlpack/tests/lsh_test.cpp</a>:</p>
<pre style='color:#555'>&gt; +  {
&gt; +    // train a model
&gt; +    LSHSearch&lt;&gt; multiprobeTest(
&gt; +        rdata,
&gt; +        numProj,
&gt; +        numTables,
&gt; +        hashWidth,
&gt; +        secondHashSize,
&gt; +        bucketSize);
&gt; +
&gt; +    double prevRecall = 0;
&gt; +    // search with varying number of probes
&gt; +    for (size_t p = 0; p &lt; probeTrials; ++p)
&gt; +    {
&gt; +      arma::Mat&lt;size_t&gt; lshNeighbors;
&gt; +      arma::mat lshDistances; //move outside of loop for speed?
</pre>
<p>No need to move it outside the loop, it should not make any noticeable difference.  No need to keep the comment, in my opinion.</p>

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