<p>In <a href="https://github.com/mlpack/mlpack/pull/753#discussion_r76695578">src/mlpack/methods/ne/utils.hpp</a>:</p>
<pre style='color:#555'>&gt; +  return dist(rng);
&gt; +}
&gt; +
&gt; +/**
&gt; + * Return a random float between [x, y]
&gt; + */
&gt; +double RandFloat(double x, double y)
&gt; +{
&gt; +  boost::random::uniform_real_distribution&lt;&gt; dist(x, y);
&gt; +  return dist(rng);
&gt; +}
&gt; +
&gt; +/**
&gt; + * Return the sign of a number.
&gt; + */
&gt; +template &lt;typename T&gt; int sgn(T val)
</pre>
<p>If we use armadillo's <code>sgn</code> function, we could remove the utils file, or do we need another function from the header file?</p>

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