<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r70025192">src/mlpack/core/data/map_policies/missing_policy.hpp</a>:</p>
<pre style='color:#555'>> +/**
> + * Same as increment map policy, but does not change type of features.
> + */
> +class MissingPolicy
> +{
> + public:
> + // typedef of mapped_type
> + using mapped_type = double;
> +
> + MissingPolicy()
> + {
> + // Nothing to initialize here.
> + }
> +
> + explicit MissingPolicy(std::set<std::string> missingSet) :
> + missingSet(std::move(missingSet))
</pre>
<p>Updated</p>
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