<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r69383804">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>&gt; +  // Reproduce next generation of population.
&gt; +  void Reproduce() {
&gt; +    // keep best genome.
&gt; +    Genome lastBestGenome = aPopulation.BestGenome();
&gt; +
&gt; +    // Remove stale species.
&gt; +    if (aPopulation.aSpecies.size() &gt; 10) {
&gt; +      RemoveStaleSpecies(aPopulation);
&gt; +    }
&gt; +    ////printf(&quot;hehe 0\n&quot;); // DEBUG
&gt; +    // Remove weak genomes in each species.
&gt; +    CullSpecies(aPopulation, aCullSpeciesPercentage);
&gt; +    ////printf(&quot;hehe 1\n&quot;); // DEBUG
&gt; +
&gt; +    // Remove weak species.
&gt; +    if (aPopulation.aSpecies.size() &gt; 10) {
</pre>
<p>As for the number of stale species, we should also provide a parameter for the number of weak species.</p>

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