code: def _fmt_arg(arg):
      if isinstance(arg, tuple):
          return arg[0](*arg[1:])
      return arg
  
imports: import logging
  import os
  from guild import cli
  from guild import guildfile
  from guild import util
  from guild import yaml_util
label_desc: Use image node_id 3 for calling a global function with example usage: _fmt_arg(arg) and returns: arg, arg