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fraction of the total is determined by C<reproduction_rate>) are selected for breeding
in proportion to their fitness.

Before breeding, each individual undergoes a process of mutation, where a fraction of
the ANN parameters is randomly perturbed. Both the size of the fraction and the
maximum extent of the perturbation is determined by C<mutation_rate>. Subsequently, the
homologous chromosomes recombine (i.e. exchange parameters) at a rate determined by
C<crossover_rate>, which then results in (haploid) gametes. These gametes are fused with
those of other individuals to give rise to the next generation.

=head1 TRAINING AND TEST DATA

The data that is used for training the ANNs and for subsequently testing their predictive
abilities are provided as tab-separated tables. An example of an input data set is here:

L<https://github.com/naturalis/ai-fann-evolving/blob/master/examples/butterbeetles.tsv>

The tables have a header row, with at least the following columns:

=over