<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69429318">src/mlpack/core/data/map_policies/increment_policy.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -46,7 +46,7 @@ class IncrementPolicy
&gt;        if (numMappings == 0)
&gt;          types[dimension] = Datatype::categorical;
&gt;  
&gt; -      typedef boost::bimap&lt;std::string, size_t&gt;::value_type PairType;
&gt; +      typedef boost::bimap&lt;std::string, mapped_type&gt;::value_type PairType;
</pre>
<p>nice catch <g-emoji alias="+1" fallback-src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f44d.png">👍</g-emoji> </p>

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