code: def add_cmdline_args(cls, parser, partial_opt):
      super().add_cmdline_args(parser, partial_opt)
      parser = parser.add_argument_group("DECODE Teacher Args")
      parser.add_argument(
          "--test_type",
          type=str,
          default="vanilla",
          help="The test sets can have three types: vanilla (default), human-bot, a2t, and rct.",
      )
      return parser
  
file_path: ParlAI/parlai/tasks/decode/agents.py
imports: import copy
  import json
  import os
  from parlai.utils.io import PathManager
  from parlai.core.teachers import DialogTeacher
  from .build import build, DECODE, DECODE_PREFIX, DECODE_FOLDER_VERSION
label_desc: Use image node_id 1 for calling the DecodeTeacher obj's underlying member method code with example usage: obj.add_cmdline_args(cls, parser, partial_opt) and returns: parser