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Index a tree for rapid lookups within a tree array.

Indexes nodes in-place as n._leaf_index.


A mapping {node_id: TreeNode}

np.array of ints

This arrays describes the IDs of every internal node, and the ID range of the immediate descendents. The first column in the array corresponds to node_id. The second column is the left most descendent’s ID. The third column is the right most descendent’s ID.