docstr: Add the command config options
code: def add_module_config_arg(self):
      """
      Add the command config options
      """
      self.arg_config_group.add_argument(
          "--use_gpu",
          type=ast.literal_eval,
          default=False,
          help="whether use GPU or not",
      )
      self.arg_config_group.add_argument(
          "--output_dir",
          type=str,
          default="ocr_result",
          help="The directory to save output images.",
      )
      self.arg_config_group.add_argument(
          "--visualization",
          type=ast.literal_eval,
          default=False,
          help="whether to save output as images.",
      )
  
imports: import argparse
  import ast
  import copy
  import math
  import os
  import time
  import cv2
  import numpy
  import paddle
  from paddle.inference import Config
  from paddle.inference import create_predictor
  from PIL import Image
  import paddlehub
  from .character import CharacterOps
  from .utils import base64_to_cv2
  from .utils import draw_ocr
  from .utils import get_image_ext
  from .utils import sorted_boxes
  from paddlehub.module.module import moduleinfo
  from paddlehub.module.module import runnable
  from paddlehub.module.module import serving
  from paddlehub.utils.log import logger
label_desc: Use image node_id 18 for calling the ChineseOCRDBCRNN obj's underlying member method code with example usage: obj.add_module_config_arg() without return types