code: def _get_cache_dir(url):
      try:
          cache_dir = CACHE_DIRS[url]
      except KeyError:
          cache_dir = CACHE_DIRS[url] = tempfile.mkdtemp("dvc-cache")
      return cache_dir
  
imports: import os
  import tempfile
  import threading
  from typing import TYPE_CHECKING, Dict, Optional, Tuple
  from funcy import retry, wrap_with
  from dvc.exceptions import NotDvcRepoError
  from dvc.log import logger
  from dvc.repo import Repo
  from dvc.scm import CloneError, map_scm_exception
  from dvc.utils import relpath
label_desc: Use image node_id 4 for calling a global function with example usage: _get_cache_dir(url) and returns: cache_dir