class_docstr: Describes an argument. Arguments to the constructor are passed to
  `add_argument`.
code: def __init__(
      self,
      *args: Any,
      completer: Optional[Callable] = None,
      **kwargs: Any,
  ) -> None:
      self.args = args
      self.kwargs = kwargs
      self.completer = completer
  
imports: import functools
  import itertools
  from argparse import SUPPRESS, ArgumentDefaultsHelpFormatter, ArgumentParser, Namespace
  from typing import Any, Callable, List, NamedTuple, Optional, Tuple, Union, cast
  from termcolor import colored
  from determined.common import util
label_desc: Use image node_id 1 to create a new Arg object  with example: obj = Arg()