o `۷i@s>ddlmZmZedZdeeefdeeeffddZdS))DictTypeVarKdreturncCs~|siSi}t|}|D].}||vrq|}|h}||vr8||}||vr-td||||}||vs|||<q|S)aCollapse transitive mappings in a dictionary. Given a mapping like {a: b, b: c, c: d}, returns {a: d}, removing intermediate b -> c, c -> d. Only keeps mappings where the key is NOT a value in another mapping (i.e., chain starting points). Args: d: Dictionary representing a mapping Returns: Dictionary with all transitive mappings collapsed, keeping only KV-pairs, such that K and V are starting and terminal point of a chain Examples: >>> collapse_transitive_map({"a": "b", "b": "c", "c": "d"}) {'a': 'd'} >>> collapse_transitive_map({"a": "b", "x": "y"}) {'a': 'b', 'x': 'y'} z Detected a cycle in the mapping )setvalues ValueErroradd)r collapsed values_setkcurvisitednextrT/home/ubuntu/vllm_env/lib/python3.10/site-packages/ray/data/_internal/collections.pycollapse_transitive_maps$   rN)typingrrrrrrrrs&