code: def __init__(self):
      self._tileable_to_sessions = WeakKeyDictionary()
  
imports: import asyncio
  import atexit
  import concurrent.futures
  import queue
  import threading
  from typing import List
  from weakref import WeakKeyDictionary, ref
  from ...lib.aio import get_isolation
  from ...typing import SessionType, TileableType
  from ..mode import enter_mode
label_desc: Use image node_id 1 to create a new _TileableDataCleaner object  with example: obj = _TileableDataCleaner()