<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r68503931">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>> + // No link.
> + if (genome.aLinkGenes.size() == 0) return;
> +
> + // Select link to split.
> + ssize_t linkIdx = mlpack::math::RandInt(0, genome.aLinkGenes.size());
> + if (!genome.aLinkGenes[linkIdx].Enabled()) return;
> +
> + genome.aLinkGenes[linkIdx].Enabled(false);
> +
> + // Check innovation already exist or not.
> + ssize_t splitLinkInnovId = genome.aLinkGenes[linkIdx].InnovationId();
> + ssize_t innovIdx = CheckNeuronInnovation(splitLinkInnovId);
> + if (innovIdx != -1) {
> + NeuronGene neuronGene(aNeuronInnovations[innovIdx].newNeuronId,
> + HIDDEN,
> + SIGMOID, // TODO: make it random??
</pre>
<p>NEAT doesn't change the activation function, but it could be interesting to see if that would increase the performance. However, we have to find a good way, to abstract that functionality from the rest of the code. I think, it's good for now to go with a static activation function.</p>
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