<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r74694664">src/mlpack/core/tree/spill_tree/spill_tree.hpp</a>:</p>
<pre style='color:#555'>> + typedef MatType Mat;
> + //! The type of element held in MatType.
> + typedef typename MatType::elem_type ElemType;
> + //! The bound type.
> + typedef typename HyperplaneType<MetricType>::BoundType BoundType;
> +
> + private:
> + //! The left child node.
> + SpillTree* left;
> + //! The right child node.
> + SpillTree* right;
> + //! The parent node (NULL if this is the root of the tree).
> + SpillTree* parent;
> + //! The number of points of the dataset contained in this node (and its
> + //! children).
> + size_t count;
</pre>
<p>Could we avoid this member and just use <code>pointsIndex.n_elem</code>?</p>
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