<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r69383593">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>> + return -1; // -1 means no match found, a new innovation.
> + }
> +
> + // Check whether a neuron innovation already exist.
> + ssize_t CheckNeuronInnovation(ssize_t splitLinkInnovId) {
> + for (ssize_t i=0; i<aNeuronInnovations.size(); ++i) {
> + if (aNeuronInnovations[i].splitLinkInnovId == splitLinkInnovId) {
> + return i;
> + }
> + }
> +
> + return -1;
> + }
> +
> + // Add a new link innovation.
> + LinkInnovation AddLinkInnovation(ssize_t fromNeuronId, ssize_t toNeuronId) {
</pre>
<p>I think it's a good idea to use a reference here:</p>
<p><code><br>
AddLinkInnovation(ssize_t fromNeuronId, ssize_t toNeuronId, LinkInnovation& linkInnov)<br>
</code></p>
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