code: def register_subcommand(parser: ArgumentParser):
      test_parser = parser.add_parser(
          "dummy_data", help="Generate dummy data."
      )
      test_parser.add_argument(
          "--auto_generate",
          action="store_true",
          help="Automatically generate dummy data",
      )
      test_parser.add_argument(
          "--n_lines",
          type=int,
          default=5,
          help="Number of lines or samples to keep when auto-generating dummy data",
      )
      test_parser.add_argument(
          "--json_field",
          type=str,
          default=None,
          help="Optional, json field to read the data from when auto-generating dummy data. In the json data files, this field must point to a list of samples as json objects (ex: the 'data' field for squad-like files)",
      )
      test_parser.add_argument(
          "--xml_tag",
          type=str,
          default=None,
          help="Optional, xml tag name of the samples inside the xml files when auto-generating dummy data.",
      )
      test_parser.add_argument(
          "--match_text_files",
          type=str,
          default=None,
          help="Optional, a comma separated list of file patterns that looks for line-by-line text files other than *.txt or *.csv. Example: --match_text_files *.label",
      )
      test_parser.add_argument(
          "--keep_uncompressed",
          action="store_true",
          help="Whether to leave the dummy data folders uncompressed when auto-generating dummy data. Useful for debugging for to do manual adjustements before compressing.",
      )
      test_parser.add_argument(
          "--cache_dir",
          type=str,
          default=None,
          help="Cache directory to download and cache files when auto-generating dummy data",
      )
      test_parser.add_argument(
          "--encoding",
          type=str,
          default=None,
          help=f"Encoding to use when auto-generating dummy data. Defaults to {DEFAULT_ENCODING}",
      )
      test_parser.add_argument(
          "path_to_dataset",
          type=str,
          help="Path to the dataset (example: ./datasets/squad)",
      )
      test_parser.set_defaults(func=dummy_data_command_factory)
  
imports: import fnmatch
  import json
  import os
  import shutil
  import tempfile
  import xml.etree.ElementTree
  from argparse import ArgumentParser
  from pathlib import Path
  from typing import Optional
  from datasets import config
  from datasets.commands import BaseDatasetsCLICommand
  from datasets.download.download_config import DownloadConfig
  from datasets.download.download_manager import DownloadManager
  from datasets.download.mock_download_manager import MockDownloadManager
  from datasets.load import dataset_module_factory, import_main_class
  from datasets.utils.deprecation_utils import deprecated
  from datasets.utils.logging import get_logger, set_verbosity_warning
  from datasets.utils.py_utils import map_nested
label_desc: Use image node_id 1 for calling the DummyDataCommand obj's underlying member method code with example usage: obj.register_subcommand(parser) without return types