<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r70633729">src/mlpack/methods/ne/neat.hpp</a>:</p>
<pre style='color:#555'>&gt; +                           genome2.aLinkGenes[idx].Weight() * linkEnabledInGenome2);
&gt; +        ++coincident;
&gt; +      }
&gt; +    }
&gt; +
&gt; +    deltaW = deltaW / coincident;
&gt; +    return deltaW;
&gt; +  }
&gt; +
&gt; +  // Whether two genome belong to same species or not.
&gt; +  bool IsSameSpecies(Genome&amp; genome1, Genome&amp; genome2) {
&gt; +    double deltaD = Disjoint(genome1, genome2);
&gt; +    double deltaW = WeightDiff(genome1, genome2);
&gt; +    double delta = aCoeffDisjoint * deltaD + aCoeffWeightDiff * deltaW;
&gt; +
&gt; +    if (delta &lt; aCompatThreshold) {
</pre>
<p>Where does this <code>aCompatThreshold = 1.0</code>  parameter come from? Depending on the calculation of the disjoint, excess, and weight difference this could be different.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">&mdash;<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/mlpack/mlpack/pull/686/files/ff45785b8669f82beb38ef5392f48bcdf5c83f6a#r70633729">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe/AJ4bFMsaj50raJQMg8vesb7rGgaFykFcks5qVPQbgaJpZM4IwJa6">mute the thread</a>.<img alt="" height="1" src="https://github.com/notifications/beacon/AJ4bFMKp6Msn9OtDNeZaz_A6bStF8KyDks5qVPQbgaJpZM4IwJa6.gif" width="1" /></p>
<div itemscope itemtype="http://schema.org/EmailMessage">
<div itemprop="action" itemscope itemtype="http://schema.org/ViewAction">
  <link itemprop="url" href="https://github.com/mlpack/mlpack/pull/686/files/ff45785b8669f82beb38ef5392f48bcdf5c83f6a#r70633729"></link>
  <meta itemprop="name" content="View Pull Request"></meta>
</div>
<meta itemprop="description" content="View this Pull Request on GitHub"></meta>
</div>