U yh@snddlmZmZddlmZddlmZmZmZm Z ee efZ eeee fdddZ ee edd d Z d S) )DictTuple)STATE_DICT_TYPE)OBJ_PATH set_elementSTATE_DICT_ITEMtraverse_state_dict) state_dictreturncs2iittddfdd }t||fS)a Flatten ``state_dict`` made of nested dicts and lists into a top level dictionary. Use ``unflatten_state_dict`` to revert this process. Returns: A tuple with the flatten state_dict and a mapping from original to new state_dict. N.B. The new keys are derived from the object paths, joined by dot. For example: ``{ 'a': {'b':...}}`` results in the key `a.b`. N)pathvaluer cs:dtt|}|kr&td|||<||<dS)N.zduplicated flatten key )joinmapstr ValueError)r r Znew_fqnZ flattenedZmappings[/var/www/html/venv/lib/python3.8/site-packages/torch/distributed/checkpoint/_nested_dict.py flat_copy#s z%flatten_state_dict..flat_copy)rrr )r rrrrflatten_state_dicts  r)r mappingr cCs*i}|D]\}}t||||q |S)zaRestore the original nested state_dict according to ``mapping`` and the flattened ``state_dict``.)itemsr)r rnestedkeyr rrrunflatten_state_dict.srN)typingrrZ%torch.distributed.checkpoint.metadatar _traverserrrr rZFLATTEN_MAPPINGrrrrrrs