<p>In <a href="https://github.com/mlpack/mlpack/pull/708#discussion_r71803833">src/mlpack/core/tree/hollow_ball_bound_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -0,0 +1,384 @@
&gt; +/**
&gt; + * @file hollow_ball_bound_impl.hpp
&gt; + *
&gt; + * Bounds that are useful for binary space partitioning trees.
&gt; + * Implementation of HollowBallBound ball bound metric policy class.
&gt; + *
&gt; + * @experimental
</pre>
<p>The <a href="https://github.com/experimental" class="user-mention">@experimental</a> mark doesn't need to be here... I think hrectbound_impl.hpp has it too, it's probably not needed there either.</p>

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