code: def is_flag_function(val):
      if not isinstance(val, str):
          return False
      try:
          _split_flag_function(val)
      except ValueError:
          return False
      else:
          return True
  
imports: import logging
  import os
  import re
  import yaml
  from guild import util
  from guild import yaml_util
label_desc: Use image node_id 33 for calling a global function with example usage: is_flag_function(val) and returns: False, True, False