code: def tfhub_cache_dir(default_cache_dir=None, use_temp=False):
      """Returns cache directory.
  
      Returns cache directory from either TFHUB_CACHE_DIR environment variable
      or --tfhub_cache_dir or default, if set.
  
      Args:
        default_cache_dir: Default cache location to use if neither TFHUB_CACHE_DIR
                           environment variable nor --tfhub_cache_dir are
                           not specified.
        use_temp: bool, Optional to enable using system's temp directory as a
                  module cache directory if neither default_cache_dir nor
                  --tfhub_cache_dir nor TFHUB_CACHE_DIR environment variable are
                  specified .
      """
  
      # Note: We are using FLAGS["tfhub_cache_dir"] (and not FLAGS.tfhub_cache_dir)
      # to access the flag value in order to avoid parsing argv list. The flags
      # should have been parsed by now in main() by tf.app.run(). If that was not
      # the case (say in Colab env) we skip flag parsing because argv may contain
      # unknown flags.
      cache_dir = (
          get_env_setting(_TFHUB_CACHE_DIR, "tfhub_cache_dir")
          or default_cache_dir
      )
      if not cache_dir and use_temp:
          # Place all TF-Hub modules under <system's temp>/tfhub_modules.
          cache_dir = os.path.join(
              tempfile.gettempdir(), "tfhub_modules"
          )
      if cache_dir:
          logging.log_first_n(
              logging.INFO, "Using %s to cache modules.", 1, cache_dir
          )
      return cache_dir
  
imports: import abc
  import datetime
  import enum
  import os
  import socket
  import ssl
  import sys
  import tarfile
  import tempfile
  import time
  import urllib
  import uuid
  from absl import flags
  from absl import logging
  import tensorflow
  from tensorflow_hub import file_utils
  from tensorflow_hub import tf_utils
label_desc: Use image node_id 2 for calling a global function with example usage: tfhub_cache_dir(default_cache_dir, use_temp) and returns: cache_dir