<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'>> @@ -0,0 +1,67 @@
> +/**
> + * @file tasks.hpp
> + * @author Bang Liu
> + *
> + * Definition of Population class.
> + */
> +#ifndef MLPACK_METHODS_NE_POPULATION_HPP
> +#define MLPACK_METHODS_NE_POPULATION_HPP
> +
> +#include <cstddef>
> +
> +#include <mlpack/core.hpp>
> +#include <mlpack/methods/ann/performance_functions/cee_function.hpp>
> +
</pre>
<p>If you use the MeanSquaredErrorFunction the header file should be:</p>
<pre><code>#include <mlpack/methods/ann/performance_functions/mse_function.hpp>
</code></pre>
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