<p>In <a href="https://github.com/mlpack/mlpack/pull/753#discussion_r73813711">src/mlpack/methods/ne/species.hpp</a>:</p>
<pre style='color:#555'>> + // Set best fitness.
> + void BestFitness(double bestFitness) { aBestFitness = bestFitness; }
> +
> + // Get best fitness.
> + double BestFitness() const { return aBestFitness; }
> +
> + // Get species size.
> + int SpeciesSize() const { return aGenomes.size(); }
> +
> + // Set best fitness to be the minimum of all genomes' fitness.
> + void SetBestFitnessAndGenome() {
> + if (aGenomes.size() == 0)
> + return;
> +
> + aBestFitness = aGenomes[0].Fitness();
> + for (int i=0; i<aGenomes.size(); ++i) {
</pre>
<p>If the species only contains one genome, start from i=1 will cause error. So I think we keep start from 0.</p>
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