class_docstr: simple cache for WarmProcess-es
      
class_docstr_tok: ["simple","cache","for","WarmProcess-es"]
docstr: stop clean worker
          
docstr_tok: ["stop","clean","worker"]
code: def _stop_clean(self) -> None:
      """stop clean worker"""
      self._stop_event.set()
  
imports: import sys
  import time
  import threading
  from typing import Optional, Callable
  from concurrent.futures import ProcessPoolExecutor, Future
  from pandas import DataFrame
  from mindsdb.utilities.config import Config
  from mindsdb.utilities.context import context
  from mindsdb.utilities.ml_task_queue.const import ML_TASK_TYPE
  from mindsdb.integrations.libs.learn_process import learn_process, predict_process
label_desc: Use image node_id 4 for calling the ProcessCache obj's underlying member method code with example usage: obj._stop_clean() without return types