code: def __len__(self):
      return len(self.cache.keys())
  
file_path: text-generation-inference/server/text_generation_server/cache.py
imports: import torch
  from typing import Dict, Optional, TypeVar
  from text_generation_server.models.types import Batch
label_desc: Use image node_id 6 for calling the Cache obj's underlying member method code with example usage: obj.__len__() and returns: len