<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69375718">src/mlpack/core/data/map_policies/missing_policy.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -26,11 +26,18 @@ class MissingPolicy
&gt;   public:
&gt;    typedef size_t mapped_type;
&gt;  
&gt; -  //explicit MissingPolicy(std::set&lt;std::string&gt; specificString) :
&gt; -    //specificString(std::move(specificString))
&gt; -  //{
&gt; -    //// Nothing to initialize here.
&gt; -  //}
&gt; +  MissingPolicy()
</pre>
<p>This looks quite weird, looks like my suggestion confuse you, sorry about that. </p>

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