Index a tree for rapid lookups within a tree array

State: Experimental as of 0.4.0.

Indexes nodes in-place as n._leaf_index.


  • dict – 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.