<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r71069041">src/mlpack/tests/ne_test.cpp</a>:</p>
<pre style='color:#555'>> + std::vector<NeuronGene> neuronGenes;
> + std::vector<LinkGene> linkGenes;
> +
> + NeuronGene inputGene1(0, INPUT, LINEAR, 0, 0, 0);
> + NeuronGene inputGene2(1, INPUT, LINEAR, 0, 0, 0);
> + NeuronGene biasGene(2, BIAS, LINEAR, 0, 0, 0);
> + NeuronGene outputGene(3, OUTPUT, SIGMOID, 1, 0, 0);
> + NeuronGene hiddenGene(4, HIDDEN, SIGMOID, 0.5, 0, 0);
> +
> + neuronGenes.push_back(inputGene1);
> + neuronGenes.push_back(inputGene2);
> + neuronGenes.push_back(biasGene);
> + neuronGenes.push_back(outputGene);
> + neuronGenes.push_back(hiddenGene);
> +
> + LinkGene link1(0, 3, 0, 1, true);
</pre>
<p>Maybe I missed something but I think each link should have a different innovation number.</p>
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