<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r69383340">src/mlpack/methods/ne/genome.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +  // Get input length.
&gt; +  ssize_t NumInput() {
&gt; +    ssize_t numInput = 0;
&gt; +    for (ssize_t i=0; i&lt;aNeuronGenes.size(); ++i) {
&gt; +      if (aNeuronGenes[i].Type() == INPUT || aNeuronGenes[i].Type() == BIAS)
&gt; +        ++numInput;
&gt; +    }
&gt; +    return numInput;
&gt; +  }
&gt; +
&gt; +  // Set input length.
&gt; +  void NumInput(ssize_t numInput) { aNumInput = numInput; }
&gt; +
&gt; +  // Get output length.
&gt; +  ssize_t NumOutput() {
</pre>
<p>The number of output neurons never changed, so we could minimize the overhead here.</p>

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