<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r66362004">src/mlpack/methods/ne/gene.hpp</a>:</p>
<pre style='color:#555'>> + SIGMOID = 0,
> + TANH,
> + LINEAR,
> + RELU,
> +};
> +
> +/**
> + * This class defines a link gene.
> + */
> +class LinkGene {
> + public:
> + // Default constructor.
> + LinkGene() {}
> +
> + // Parametric constructor.
> + LinkGene(unsigned int fromNeuronId,
</pre>
<p>Can you use <code>size_t</code> instead of <code>unsigned int</code>. It's guaranteed to be big enough to hold the size of the biggest object on your system. Also, I would recommend to use <code>const</code>here, so <code>const size_t fromNeuronId</code>.</p>
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