def default_root_dir(self) -> str:
        """The default location to save artifacts of loggers, checkpoints etc.

        It is used as a fallback if logger or checkpoint callback do not define specific save paths.

        """
        if _is_local_file_protocol(self._default_root_dir):
            return os.path.normpath(os.path.expanduser(self._default_root_dir))
        return self._default_root_dir
The default location to save artifacts of loggers, checkpoints etc.

        It is used as a fallback if logger or checkpoint callback do not define specific save paths.

        
src/lightning/pytorch/trainer/trainer.py