<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'>> +
> + // Get aFromNeuronId.
> + unsigned int FromNeuronId() const { return aFromNeuronId; }
> +
> + // Get aToNeuronId.
> + unsigned int ToNeuronId() const { return aToNeuronId; }
> +
> + // Get aInnovationId.
> + unsigned int InnovationId() const { return aInnovationId; }
> +
> + // Set aWeight.
> + void Weight(double weight) { aWeight = weight; }
> +
> + // Get aWeight.
> + double Weight() const { return aWeight; }
> +
</pre>
<p>I'm wondering, what means <code>a</code> in front of a parameter?</p>
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