<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r66363744">src/mlpack/methods/ne/gene.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +  // Get aFromNeuronId.
&gt; +  unsigned int FromNeuronId() const { return aFromNeuronId; }
&gt; +
&gt; +  // Get aToNeuronId.
&gt; +  unsigned int ToNeuronId() const { return aToNeuronId; }
&gt; +
&gt; +  // Get aInnovationId.
&gt; +  unsigned int InnovationId() const { return aInnovationId; }
&gt; +
&gt; +  // Set aWeight.
&gt; +  void Weight(double weight) { aWeight = weight; }
&gt; +
&gt; +  // Get aWeight.
&gt; +  double Weight() const { return aWeight; }
&gt; +
</pre>
<p>I'm wondering, what means <code>a</code> in front of a parameter?</p>

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