code: def join(self) -> None:
      pass
  
imports: from __future__ import annotations
  import collections
  import functools
  import itertools
  import multiprocessing
  import multiprocessing.dummy
  import os
  import queue
  import tempfile
  from typing import TYPE_CHECKING, overload
  import numpy
  from dedupe.backport import RLock
label_desc: Use image node_id 2 for calling the MockPool obj's underlying member method code with example usage: obj.join() without return types