<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'>> @@ -464,6 +498,8 @@ std::string NSModel<SortPolicy>::TreeName() const
> return "R tree";
> case R_STAR_TREE:
> return "R* tree";
> + case X_TREE:
> + return "X tree";
</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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