<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r66362396">src/mlpack/methods/ne/gene.hpp</a>:</p>
<pre style='color:#555'>&gt; +    SIGMOID = 0,
&gt; +    TANH,
&gt; +    LINEAR,
&gt; +    RELU,
&gt; +};
&gt; +
&gt; +/**
&gt; + * This class defines a link gene.
&gt; + */
&gt; +class LinkGene {
&gt; + public:
&gt; +  // Default constructor.
&gt; +  LinkGene() {}
&gt; +
&gt; +  // Parametric constructor.
&gt; +  LinkGene(unsigned int fromNeuronId,
</pre>
<p><a href="https://github.com/zoq" class="user-mention">@zoq</a> Yeah, good idea. Do I need to change other unsigned int parameters or function arguments to size_t, or just the ids of gene, genome?</p>

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