<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'>&gt; + * Missing map policy for dataset info.
&gt; + */
&gt; +#ifndef MLPACK_CORE_DATA_MAP_POLICIES_MISSING_POLICY_HPP
&gt; +#define MLPACK_CORE_DATA_MAP_POLICIES_MISSING_POLICY_HPP
&gt; +
&gt; +#include &lt;mlpack/core.hpp&gt;
&gt; +#include &lt;unordered_map&gt;
&gt; +#include &lt;boost/bimap.hpp&gt;
&gt; +
&gt; +
&gt; +using namespace std;
&gt; +
&gt; +namespace mlpack {
&gt; +namespace data {
&gt; +
&gt; +// 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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