<p>In <a href="https://github.com/mlpack/mlpack/pull/757#discussion_r73979883">src/mlpack/methods/ann/layer/concat_layer.hpp</a>:</p>
<pre style='color:#555'>> + * Definition of the ConcatLayer class.
> + */
> +
> +#ifndef MLPACK_METHODS_ANN_LAYER_CONCAT_LAYER_HPP
> +#define MLPACK_METHODS_ANN_LAYER_CONCAT_LAYER_HPP
> +
> +#include <mlpack/core.hpp>
> +#include <mlpack/methods/ann/activation_functions/rectifier_function.hpp>
> +#include <mlpack/methods/ann/layer/layer_traits.hpp>
> +#include <mlpack/methods/ann/layer/one_hot_layer.hpp>
> +#include <mlpack/methods/ann/layer/conv_layer.hpp>
> +#include <mlpack/methods/ann/layer/pooling_layer.hpp>
> +#include <mlpack/methods/ann/layer/softmax_layer.hpp>
> +#include <mlpack/methods/ann/layer/bias_layer.hpp>
> +#include <mlpack/methods/ann/layer/linear_layer.hpp>
> +#include <mlpack/methods/ann/layer/base_layer.hpp>
</pre>
<p>It looks like, we can remove all header files except:</p>
<pre><code>#include <mlpack/core.hpp>
#include <mlpack/methods/ann/layer/layer_traits.hpp>
</code></pre>
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