<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68646859">src/mlpack/tests/lsh_test.cpp</a>:</p>
<pre style='color:#555'>&gt; +  // perturbation vectors will map to C1 cluster&#39;s bins.
&gt; +  arma::mat q1;
&gt; +  q1 &lt;&lt; 1.1 &lt;&lt; arma::endr &lt;&lt; 3.3; // vector [1.1, 3.3]
&gt; +
&gt; +  arma::Mat&lt;size_t&gt; neighbors;
&gt; +  arma::mat distances;
&gt; +
&gt; +  // Test that q1 simple search comes up empty
&gt; +  lshTest.Search(q1, k, neighbors, distances);
&gt; +  cout &lt;&lt; neighbors &lt;&lt; endl;
&gt; +  BOOST_REQUIRE( arma::all(neighbors.col(0) == N) );
&gt; +
&gt; +  // Searching with 3 additional probing bins should find neighbors
&gt; +  lshTest.Search(q1, k, neighbors, distances, 0, 3);
&gt; +  cout &lt;&lt; neighbors &lt;&lt; endl;
&gt; +  BOOST_REQUIRE( arma::all(neighbors.col(0) == N || neighbors.col(0) &lt; 10) );
</pre>
<p>Extra spaces here too... <code>BOOST_REQUIRE(arma::all(neighbors.col(0) == N || neighbors.col(0) &lt; 10));</code></p>

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