<p>In <a href="https://github.com/mlpack/mlpack/pull/605#discussion_r58573898">src/mlpack/tests/lsh_test.cpp</a>:</p>
<pre style='color:#555'>&gt;  
&gt;  using namespace std;
&gt;  using namespace mlpack;
&gt;  using namespace mlpack::neighbor;
&gt;  
&gt; +double compute_recall(
&gt; +    arma::Mat&lt;size_t&gt; LSHneighbors, 
&gt; +    arma::Mat&lt;size_t&gt; groundTruth)
&gt; +{
&gt; +  const int n_queries = LSHneighbors.n_cols;
&gt; +  const int n_neigh = LSHneighbors.n_rows;
</pre>
<p>Really minor style note: we should avoid underscores in variable names... I'd suggest just <code>queries</code> and <code>neigh</code>.</p>

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