<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r69383738">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>> + double totalAverageRank = std::accumulate(speciesAverageRank.begin(), speciesAverageRank.end(), 0);
> +
> + for (ssize_t i=0; i<population.aSpecies.size(); ++i) {
> + double weak = (std::floor(speciesAverageRank[i] * population.PopulationSize() / totalAverageRank)
> + > 1);
> + if (weak) {
> + population.RemoveSpecies(i);
> + }
> + }
> + }
> +
> + // Remove empty species.
> + void RemoveEmptySpecies(Population& population) {
> + for (ssize_t i=0; i<population.aSpecies.size(); ++i) {
> + if (population.aSpecies[i].aGenomes.size() == 0) {
> + population.aSpecies.erase(population.aSpecies.begin() + i);
</pre>
<p>I would go with the extra <code>RemoveSpecies</code>function.</p>
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