<p>In <a href="https://github.com/mlpack/mlpack/pull/684#discussion_r66615891">src/mlpack/tests/aknn_test.cpp</a>:</p>
<pre style='color:#555'>&gt; +BOOST_AUTO_TEST_SUITE(AKNNTest);
&gt; +
&gt; +/**
&gt; + * Test the dual-tree nearest-neighbors method with different values for
&gt; + * epsilon. This uses both a query and reference dataset.
&gt; + *
&gt; + * Errors are produced if the results are not according to relative error.
&gt; + */
&gt; +BOOST_AUTO_TEST_CASE(DualTreeVsNaive1)
&gt; +{
&gt; +  arma::mat dataset;
&gt; +
&gt; +  if (!data::Load(&quot;test_data_3_1000.csv&quot;, dataset))
&gt; +    BOOST_FAIL(&quot;Cannot load test dataset test_data_3_1000.csv!&quot;);
&gt; +
&gt; +  KNN naive(dataset, true);
</pre>
<p>Ok, if I understand properly, you propose to replace naive by dual-tree search? Yes, I agree, I will do that.</p>

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