code: def _autogenerate_dummy_data(
      self, dataset_builder, mock_dl_manager, keep_uncompressed
  ) -> Optional[bool]:
      dl_cache_dir = (
          os.path.join(self._cache_dir, config.DOWNLOADED_DATASETS_DIR)
          if self._cache_dir
          else config.DOWNLOADED_DATASETS_PATH
      )
      download_config = DownloadConfig(cache_dir=dl_cache_dir)
      dl_manager = DummyDataGeneratorDownloadManager(
          dataset_name=self._dataset_name,
          mock_download_manager=mock_dl_manager,
          download_config=download_config,
      )
      dataset_builder._split_generators(dl_manager)
      mock_dl_manager.load_existing_dummy_data = (
          False  # don't use real dummy data
      )
      dl_manager.auto_generate_dummy_data_folder(
          n_lines=self._n_lines,
          json_field=self._json_field,
          xml_tag=self._xml_tag,
          match_text_files=self._match_text_files,
          encoding=self._encoding,
      )
      if not keep_uncompressed:
          path_do_dataset = os.path.join(
              mock_dl_manager.datasets_scripts_dir,
              mock_dl_manager.dataset_name,
          )
          dl_manager.compress_autogenerated_dummy_data(path_do_dataset)
          # now test that the dummy_data.zip file actually works
          mock_dl_manager.load_existing_dummy_data = (
              True  # use real dummy data
          )
          n_examples_per_split = {}
          os.makedirs(dataset_builder._cache_dir, exist_ok=True)
          try:
              split_generators = dataset_builder._split_generators(
                  mock_dl_manager
              )
              for split_generator in split_generators:
                  dataset_builder._prepare_split(
                      split_generator, check_duplicate_keys=False
                  )
                  n_examples_per_split[
                      split_generator.name
                  ] = split_generator.split_info.num_examples
          except OSError as e:
              logger.error(
                  f"Failed to load dummy data for config '{dataset_builder.config.name}''.\nOriginal error:\n"
                  + str(e)
              )
              return False
          else:
              if all(
                  n_examples > 0
                  for n_examples in n_examples_per_split.values()
              ):
                  logger.warning(
                      f"Dummy data generation done and dummy data test succeeded for config '{dataset_builder.config.name}''."
                  )
                  return True
              else:
                  empty_splits = [
                      split_name
                      for split_name in n_examples_per_split
                      if n_examples_per_split[split_name] == 0
                  ]
                  logger.warning(
                      f"Dummy data generation done but dummy data test failed since splits {empty_splits} have 0 examples for config '{dataset_builder.config.name}''."
                  )
                  return False
      else:
          generated_dummy_data_dir = os.path.join(
              self._path_to_dataset, mock_dl_manager.dummy_data_folder
          )
          logger.info(
              f"Dummy data generated in directory '{generated_dummy_data_dir}' but kept uncompressed. "
              "Please compress this directory into a zip file to use it for dummy data tests."
          )
  
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 4 for calling the DummyDataCommand obj's underlying member method code with example usage: obj._autogenerate_dummy_data(dataset_builder, mock_dl_manager, keep_uncompressed) and returns: False, True, False