<p>In <a href="https://github.com/mlpack/mlpack/pull/693#discussion_r67442263">src/mlpack/methods/neighbor_search/ns_model.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -37,6 +49,127 @@ struct NSModelName&lt;FurthestNeighborSort&gt;
&gt;    static const std::string Name() { return &quot;furthest_neighbor_search_model&quot;; }
&gt;  };
&gt;  
&gt; +class MonoSearchVisitor : public boost::static_visitor&lt;void&gt;
</pre>
<p>Ah, I hate to be picky, so I hope I am not giving too much work, but do you think you could add documentation for these classes and their members and member functions?  I am not sure everyone who looks through this file will be familiar with the visitor paradigm; there is no need to explain what that is in your comments, but it may be useful to have comments along the lines of "MonoSearchVisitor executes a monochromatic neighbor search on the given NSType", or something like this.  Maybe a few more words are useful to explain that better. :)</p>

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