code: def tfhub_cache_dir(default_cache_dir=None, use_temp=False):
    
  
    # 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 = (
        os.getenv(_TFHUB_CACHE_DIR, "") or FLAGS["tfhub_cache_dir"].value 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
docs: 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 .