docstr: Remove key from the cache
docstr_tok: ["Remove","key","from","the","cache"]
code: def invalidate(self, key):
      """Remove key from the cache"""
  
imports: from abc import abstractmethod
  from abc import ABCMeta
  import threading
  import time
  import uuid
  import inspect
label_desc: Use image node_id 4 for calling the Cache obj's underlying member method code with example usage: obj.invalidate(key) without return types