<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r71060987">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>> + bool BreedChild(Species& species, Genome& childGenome, double crossoverProb) {
> + ////printf("breed 1\n");
> + double p = mlpack::math::Random();
> + ssize_t speciesSize = species.aGenomes.size();
> + ////printf("species size is %d \n", speciesSize);
> + ////printf("breed 2\n");
> + if (speciesSize == 0)
> + return false;
> +
> + if (p < crossoverProb) {
> + ssize_t idx1 = mlpack::math::RandInt(0, speciesSize);
> + ssize_t idx2 = mlpack::math::RandInt(0, speciesSize);
> + ////printf("idx1 is %d\n", idx1);
> + ////printf("idx2 is %d\n", idx2);
> + ////printf("breed 3\n");
> + Crossover(species.aGenomes[idx1], species.aGenomes[idx2], childGenome);
</pre>
<p>Revised.</p>
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