code: def __init__(self) -> None:
      self.skip_tracker: Optional[SkipTracker] = None
  
imports: from contextlib import contextmanager
  import threading
  from typing import Dict, Generator, List, Optional, Tuple
  from torch import Tensor
  from ..checkpoint import is_checkpointing
  from ..dependency import fork, join
  from ..microbatch import Batch
  from ..stream import AbstractStream
  from .layout import SkipLayout
  from .namespace import Namespace
  from .portal import Portal
label_desc: Use image node_id 1 to create a new ThreadLocal object from inherited base classes: threading with example: obj = ThreadLocal()