<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r66363623">src/mlpack/methods/ne/gene.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +  // Destructor.
&gt; +  ~LinkGene() {}
&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; +
</pre>
<p>Can you use:</p>

<p><code>double&amp; Weight() { return weight; }</code></p>

<p>instead of a setter function that takes an argument, to be consistent with the rest of mlpack.</p>

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