code: def __init__(self) -> None:
      self.events: List[StatefulTensorMemoryEvent] = []
      self._tracing = False
  
imports: import os
  import threading
  import time
  from enum import Enum
  from typing import List
  import torch
  from colossalai.gemini.ophooks import BaseOpHook
  from colossalai.gemini.stateful_tensor import StatefulTensor
  from colossalai.legacy.engine import Engine
  from colossalai.legacy.utils.profiler.extention import ProfilerExtension
label_desc: Use image node_id 1 to create a new StatefulTensorMemoryTracer object  with example: obj = StatefulTensorMemoryTracer()