<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r69383638">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>&gt; +                        true);
&gt; +    genome.AddLink(inputLink);
&gt; +    genome.AddLink(outputLink);
&gt; +  }
&gt; +
&gt; +  // Mutate: enable disabled, or disable enabled link.
&gt; +  void MutateEnableDisable(Genome&amp; genome, bool enabled, double mutateProb) {
&gt; +    std::vector&lt;ssize_t&gt; linkIndexs;
&gt; +    for (ssize_t i=0; i&lt;genome.NumLink(); ++i) {
&gt; +      if (genome.aLinkGenes[i].Enabled() == enabled) {
&gt; +        linkIndexs.push_back(i);
&gt; +      }
&gt; +    }
&gt; +
&gt; +    double p = mlpack::math::Random();
&gt; +    if (p&lt;mutateProb &amp;&amp; linkIndexs.size()&gt;0) {
</pre>
<p>I think it worth to check the mutate probability before we generate the <code>linkIndexs</code>list.</p>

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