code: def _munge_featureset_name(name_or_list: Union[Iterable, str]) -> str:
      """
      Create a munged name for the featureset.
  
      Join features in ``featureset`` with a '+' if ``featureset`` is not a string.
      Otherwise, returns ``featureset``.
  
      Parameters
      ----------
      name_or_list : Union[Iterable, str]
          A featureset name or name components in a list.
  
      Returns
      -------
      res : str
          name components joined with '+' if input is a list or the name itself.
      """
      if isinstance(name_or_list, str):
          return name_or_list
  
      res = "+".join(sorted(name_or_list))
      return res
  
file_path: skll/skll/config/utils.py
imports: import csv
  import errno
  import logging
  from pathlib import Path
  from typing import Iterable, List, Union
  from ruamel.yaml import YAML
  from skll.types import FoldMapping, PathOrStr
label_desc: Use image node_id 4 for calling a global function with example usage: _munge_featureset_name(name_or_list) and returns: res, name_or_list