code: def get_config_file():
      f = LOCAL_CONFIG_FILE_OVERRIDE_VAR.get()
      f = f if f else LOCAL_CONFIG_FILES[-1]
      return expanduser(expandvars(f)) if f else None
  
file_path: clearml/clearml/backend_config/defs.py
imports: from os.path import expanduser, expandvars, exists
  from pathlib2 import Path
  from .environment import EnvEntry
label_desc: Use image node_id 3 for calling a global function with example usage: get_config_file() and returns: unknown