<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r73785477">src/mlpack/core/tree/spill_tree/spill_tree.hpp</a>:</p>
<pre style='color:#555'>> + const StatisticType& Stat() const { return stat; }
> + //! Return the statistic object for this node.
> + StatisticType& Stat() { return stat; }
> +
> + //! Return whether or not this node is a leaf (true if it has no children).
> + bool IsLeaf() const;
> +
> + //! Gets the left child of this node.
> + SpillTree* Left() const { return left; }
> + //! Modify the left child of this node.
> + SpillTree*& Left() { return left; }
> +
> + //! Gets the right child of this node.
> + SpillTree* Right() const { return right; }
> + //! Modify the right child of this node.
> + SpillTree*& Right() { return right; }
</pre>
<p>I think Left() and Right() functions are more intuitive. In this specific case of course. </p>
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