<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r75176269">src/mlpack/methods/ne/neuron_gene.hpp</a>:</p>
<pre style='color:#555'>> + /**
> + * Parametric constructor.
> + *
> + * @param id Neuron's ID.
> + * @param type Neuron's type: INPUT, BIAS, HIDDEN, OUTPUT.
> + * @param actFuncType The type of activation function.
> + * @param depth The depth of the neuron.
> + * @param coordinate The coordinate of the neuron.
> + * @param input Neuron's input value.
> + * @param activation Neuron's activation value.
> + */
> + NeuronGene(int id,
> +          NeuronType type,
> +          ActivationFuncType actFuncType,
> + double depth,
> + std::vector<double> coordinate,
</pre>
<p>I think it would be a good idea to provide another constructor, that uses a default value for <code>coordinate</code>. So that I can use:</p>
<pre><code>NeuronGene inputGene1(0, INPUT, LINEAR, 0, 0, 0);
</code></pre>
<p>instead of:</p>
<pre><code>NeuronGene inputGene1(0, INPUT, LINEAR, 0, std::vector<double>(), 0, 0);
</code></pre>
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