code: def _make_path(self, filename) -> str:
      return os.path.join(self.cache_dir, filename)
  
imports: import json
  import os
  import random
  from abc import ABC, abstractmethod
  from pathlib import Path
  from typing import Dict, Optional
  import hashlib
label_desc: Use image node_id 2 for calling the FileCacheManager obj's underlying member method code with example usage: obj._make_path(filename) and returns: os