<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r75047960">src/mlpack/tests/knn_test.cpp</a>:</p>
<pre style='color:#555'>&gt; +  dataset.randu(50, 300); // 50 dimensional, 300 points.
&gt; +
&gt; +  const size_t k = 15;
&gt; +  double tau = 0;
&gt; +
&gt; +  for (size_t test = 0; test &lt; 2; test++)
&gt; +  {
&gt; +    switch (test)
&gt; +    {
&gt; +      case 0:
&gt; +        tau = 0;
&gt; +        break;
&gt; +      case 1:
&gt; +        tau = 0.1;
&gt; +        break;
&gt; +    }
</pre>
<p>Done in <a href="https://github.com/mlpack/mlpack/pull/747/commits/f989164147b33ba87192c311fff19622cc59f714" class="commit-link"><tt>f989164</tt></a></p>

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