<p>In <a href="https://github.com/mlpack/mlpack/pull/556#discussion_r58482108">src/mlpack/methods/neighbor_search/ns_model_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -464,6 +498,8 @@ std::string NSModel&lt;SortPolicy&gt;::TreeName() const
&gt;        return &quot;R tree&quot;;
&gt;      case R_STAR_TREE:
&gt;        return &quot;R* tree&quot;;
&gt; +    case X_TREE:
&gt; +      return &quot;X tree&quot;;
</pre>
<p>If you don't mind, when I merge this I'll probably just change all of the x-tree cases to come after the ball tree, like in the enum.  It's a really trivial change but it preserves the ordering and makes it easier to read, in my opinion.</p>

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