<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'>&gt; +  /**
&gt; +   * Parametric constructor.
&gt; +   *
&gt; +   * @param id Neuron&#39;s ID.
&gt; +   * @param type Neuron&#39;s type: INPUT, BIAS, HIDDEN, OUTPUT.
&gt; +   * @param actFuncType The type of activation function.
&gt; +   * @param depth The depth of the neuron.
&gt; +   * @param coordinate The coordinate of the neuron.
&gt; +   * @param input Neuron&#39;s input value.
&gt; +   * @param activation Neuron&#39;s activation value.
&gt; +   */
&gt; +  NeuronGene(int id,
&gt; +                   NeuronType type,
&gt; +                   ActivationFuncType actFuncType,
&gt; +             double depth,
&gt; +             std::vector&lt;double&gt; 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&lt;double&gt;(), 0, 0);
</code></pre>

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