<p>In <a href="https://github.com/mlpack/mlpack/pull/686#discussion_r66709969">src/mlpack/methods/ne/tasks.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -0,0 +1,67 @@
&gt; +/**
&gt; + * @file tasks.hpp
&gt; + * @author Bang Liu
&gt; + *
&gt; + * Definition of Population class.
&gt; + */
&gt; +#ifndef MLPACK_METHODS_NE_POPULATION_HPP
&gt; +#define MLPACK_METHODS_NE_POPULATION_HPP
&gt; +
&gt; +#include &lt;cstddef&gt;
&gt; +
&gt; +#include &lt;mlpack/core.hpp&gt;
&gt; +#include &lt;mlpack/methods/ann/performance_functions/cee_function.hpp&gt;
&gt; +
</pre>
<p>If you use the MeanSquaredErrorFunction the header file should be:</p>

<pre><code>#include &lt;mlpack/methods/ann/performance_functions/mse_function.hpp&gt;
</code></pre>

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