code: def _prepare_cache_filepath(filepath: str):
      r"""
      检查filepath是否可以作为合理的cache文件. 如果可以的话，会自动创造路径
  
      :param filepath: str.
      :return: None, if not, this function will raise error
      """
      _cache_filepath = os.path.abspath(filepath)
      if os.path.isdir(_cache_filepath):
          raise RuntimeError(
              "The cache_file_path must be a file, not a directory."
          )
      cache_dir = os.path.dirname(_cache_filepath)
      if not os.path.exists(cache_dir):
          os.makedirs(cache_dir, exist_ok=True)
  
imports: from datetime import datetime
  import hashlib
  import _pickle
  import functools
  import os
  import re
  from typing import Callable, List, Any, Optional
  import inspect
  import ast
  from collections import deque
  from fastNLP.core.log.logger import logger
  from fastNLP.core.log.highlighter import ColorHighlighter
  from .utils import _get_fun_msg
label_desc: Use image node_id 4 for calling a global function with example usage: _prepare_cache_filepath(filepath) without return types