tree_rgb_map
tree_rgb_map(labels, tree_structure, item_leaf_map)Assign colors by DFS leaf order of the DYF tree.
Leaves adjacent in DFS share subtree ancestry, so they get similar hues. This produces smooth color gradients within tree subtrees and natural discontinuities at subtree boundaries.
Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| labels | per-item cluster/bucket labels (array-like of ints) | required | |
| tree_structure | list of node dicts from idx.get_tree_structure() | required | |
| item_leaf_map | array of length N mapping item index → leaf node_id | required |