class_docstr: atis data class for nlu joint task.
code: def after_download(self) -> bool:
      try:
          summary_joint_nlu_data(
              os.path.join(self.download_dir, "atis.train.pkl"),
              os.path.join(self.data_dir, self.train_file),
          )
          summary_joint_nlu_data(
              os.path.join(self.download_dir, "atis.test.pkl"),
              os.path.join(self.data_dir, self.test_file),
          )
      except Exception as e:
          logging.warning(traceback.format_exc())
          return False
      return True
  
file_path: delta/delta/data/datasets/atis.py
imports: import os
  import traceback
  import wget
  from absl import logging
  from delta.data.datasets.base_dataset import BaseDataSet
  from delta.data.datasets.utils import summary_joint_nlu_data
  from delta.utils.register import registers
label_desc: Use image node_id 3 for calling the ATIS obj's underlying member method code with example usage: obj.after_download() and returns: True, False