<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r75172028">src/mlpack/core/tree/spill_tree/typedef.hpp</a>:</p>
<pre style='color:#555'>&gt; + *   booktitle = {Advances in Neural Information Processing Systems 17},
&gt; + *   year = {2005},
&gt; + *   pages = {825--832}
&gt; + * }
&gt; + * @endcode
&gt; + *
&gt; + * This template typedef satisfies the TreeType policy API.
&gt; + *
&gt; + * @see @ref trees, SpillTree, MeanSPTree
&gt; + */
&gt; +template&lt;typename MetricType, typename StatisticType, typename MatType&gt;
&gt; +using SPTree = SpillTree&lt;MetricType,
&gt; +                         StatisticType,
&gt; +                         MatType,
&gt; +                         AxisOrthogonalHyperplane,
&gt; +                         MidpointSpaceSplit&gt;;
</pre>
<p>Hi <a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> , I considered <code>SPTree</code> because in the original paper <a href="http://www.cs.cmu.edu/%7Eagray/approxnn.pdf">[1]</a>, "spill-tree"  is abbreviated to "sp-tree".<br>
Mmm I am not really good with names.</p>

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