<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r66940905">src/mlpack/core/data/map_policies/missing_policy.hpp</a>:</p>
<pre style='color:#555'>> + * Missing map policy for dataset info.
> + */
> +#ifndef MLPACK_CORE_DATA_MAP_POLICIES_MISSING_POLICY_HPP
> +#define MLPACK_CORE_DATA_MAP_POLICIES_MISSING_POLICY_HPP
> +
> +#include <mlpack/core.hpp>
> +#include <unordered_map>
> +#include <boost/bimap.hpp>
> +
> +
> +using namespace std;
> +
> +namespace mlpack {
> +namespace data {
> +
> +// TODO: move this to somewhere else so that it can be reused.
</pre>
<p>Move it to a new file called type?</p>
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