def load(self, path: str, checkpointables: Optional[List[str]] = None) -> object:
        """
        Load from the given checkpoint. When path points to network file, this
        function has to be called on all ranks.

        Args:
            path (str): path or url to the checkpoint. If empty, will not load
                anything.
            checkpointables (list): List of checkpointable names to load. If not
                specified (None), will load all the possible checkpointables.
        Returns:
            dict:
                extra data loaded from the checkpoint that has not been
                processed. For example, those saved with
                :meth:`.save(**extra_data)`.
        """
        if not path:
            # no checkpoint provided
            self.logger.info("No checkpoint found. Training model from scratch")
            return {}
        self.logger.info("Loading checkpoint from {}".format(path))
        if not os.path.isfile(path):
            path = self.path_manager.get_local_path(path)
            assert os.path.isfile(path), "Checkpoint {} not found!".format(path)

        checkpoint = self._load_file(path)
        incompatible = self._load_model(checkpoint)
        if (
                incompatible is not None
        ):  # handle some existing subclasses that returns None
            self._log_incompatible_keys(incompatible)

        for key in self.checkpointables if checkpointables is None else checkpointables:
            if key in checkpoint:  # pyre-ignore
                self.logger.info("Loading {} from {}".format(key, path))
                obj = self.checkpointables[key]
                obj.load_state_dict(checkpoint.pop(key))  # pyre-ignore

        # return any further checkpoint data
        return checkpoint

        Load from the given checkpoint. When path points to network file, this
        function has to be called on all ranks.

        Args:
            path (str): path or url to the checkpoint. If empty, will not load
                anything.
            checkpointables (list): List of checkpointable names to load. If not
                specified (None), will load all the possible checkpointables.
        Returns:
            dict:
                extra data loaded from the checkpoint that has not been
                processed. For example, those saved with
                :meth:`.save(**extra_data)`.
        
fastreid/utils/checkpoint.py