code: def get_data_dir() -> str:
      """Get the DeepChem data directory.
  
      Returns
      -------
      str
          The default path to store DeepChem data. If you want to
          change this path, please set your own path to `DEEPCHEM_DATA_DIR`
          as an environment variable.
      """
      if "DEEPCHEM_DATA_DIR" in os.environ:
          return os.environ["DEEPCHEM_DATA_DIR"]
      return tempfile.gettempdir()
  
imports: import joblib
  import gzip
  import pickle
  import os
  import tempfile
  import tarfile
  import zipfile
  import logging
  from urllib.request import urlretrieve
  from typing import Any, Iterator, List, Optional, Tuple, Union, cast, IO
  import pandas
  import numpy
  import deepchem
label_desc: Use image node_id 2 for calling a global function with example usage: get_data_dir() and returns: tempfile, os