# skbio.tree.TreeNode.index_tree¶

TreeNode.index_tree()[source]

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.

Returns

• 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.