<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'>> + * booktitle = {Advances in Neural Information Processing Systems 17},
> + * year = {2005},
> + * pages = {825--832}
> + * }
> + * @endcode
> + *
> + * This template typedef satisfies the TreeType policy API.
> + *
> + * @see @ref trees, SpillTree, MeanSPTree
> + */
> +template<typename MetricType, typename StatisticType, typename MatType>
> +using SPTree = SpillTree<MetricType,
> + StatisticType,
> + MatType,
> + AxisOrthogonalHyperplane,
> + MidpointSpaceSplit>;
</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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