<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'>&gt; +  bool BreedChild(Species&amp; species, Genome&amp; childGenome, double crossoverProb) {
&gt; +    ////printf(&quot;breed 1\n&quot;);
&gt; +    double p = mlpack::math::Random();
&gt; +    ssize_t speciesSize = species.aGenomes.size();
&gt; +    ////printf(&quot;species size is %d \n&quot;, speciesSize);
&gt; +    ////printf(&quot;breed 2\n&quot;);
&gt; +    if (speciesSize == 0)
&gt; +      return false;
&gt; +
&gt; +    if (p &lt; crossoverProb) {
&gt; +      ssize_t idx1 = mlpack::math::RandInt(0, speciesSize);
&gt; +      ssize_t idx2 = mlpack::math::RandInt(0, speciesSize);
&gt; +      ////printf(&quot;idx1 is %d\n&quot;, idx1);
&gt; +      ////printf(&quot;idx2 is %d\n&quot;, idx2);
&gt; +      ////printf(&quot;breed 3\n&quot;);
&gt; +      Crossover(species.aGenomes[idx1], species.aGenomes[idx2], childGenome);
</pre>
<p>Revised.</p>

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