code: def set_cfg_example(cfg):
      r"""This function sets the default config value for customized options
      :return: customized configuration use by the experiment.
      """
      # ----------------------------------------------------------------------- #
      # Customized options
      # ----------------------------------------------------------------------- #
  
      # example argument
      cfg.example_arg = "example"
  
      # example argument group
      cfg.example_group = CN()
  
      # then argument can be specified within the group
      cfg.example_group.example_arg = "example"
  
label_desc: Use image node_id 1 for calling a global function with example usage: set_cfg_example(cfg) without return types