code: def _get_cache_dir_or_create(cache_dir: Optional[str]) -> str:
      """Gets the cache directory or creates it if not exists."""
      if cache_dir is None:
          cache_dir = tempfile.mkdtemp()
      if not tf.io.gfile.exists(cache_dir):
          tf.io.gfile.makedirs(cache_dir)
      return cache_dir
  
imports: import abc
  import collections
  import hashlib
  import json
  import math
  import os
  import tempfile
  from typing import Any, Dict, List, Mapping, Optional
  import xml.etree.ElementTree
  import tensorflow
  from mediapipe.model_maker.python.core.data import cache_files
  from official.vision.data import tfrecord_lib
label_desc: Use image node_id 2 for calling a global function with example usage: _get_cache_dir_or_create(cache_dir) and returns: cache_dir