<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69430620">src/mlpack/core/data/map_policies/missing_policy.hpp</a>:</p>
<pre style='color:#555'>>
> - typedef boost::bimap<std::string, size_t>::value_type PairType;
> - maps[dimension].first.insert(PairType(string, numMappings));
> - return numMappings++;
> + typedef boost::bimap<std::string, mapped_type>::value_type PairType;
> + maps[dimension].first.insert(PairType(string, NaN));
</pre>
<p>Execute ++numMappings at here maybe is better, because insert may throw exception.</p>
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