code: def __init__(self, session_id: str):
      self._session_id = session_id
      self._tileable_key_to_chunk_keys = dict()
      self._tileable_ref_counts = defaultdict(lambda: 0)
      self._chunk_ref_counts = defaultdict(lambda: 0)
  
      self._meta_api: Optional[MetaAPI] = None
  
imports: import asyncio
  import itertools
  import logging
  from collections import defaultdict
  from typing import Dict, List, Optional
  from ....None import oscar
  from ....lib.aio import alru_cache
  from ...meta.api import MetaAPI
  from ...storage.api import StorageAPI
  from ..errors import TileableNotTracked
label_desc: Use image node_id 1 to create a new LifecycleTrackerActor object from inherited base classes: mo with example: obj = LifecycleTrackerActor(session_id)