code: def __enter__(self):
      if _Profiler._CURRENT_PROFILER is not None:
          raise ValueError(
              "Only one xformers profiler can be active at a time"
          )
      _Profiler._CURRENT_PROFILER = self
      self.update_profilers_on_step()
  
      return self
  
imports: import logging
  import os
  import queue
  import socket
  import weakref
  from dataclasses import dataclass
  from pathlib import Path
  from typing import Any, List, Optional, Sequence, Tuple
  import torch.cuda.memory
  import torch.cuda.nvtx
  import torch.nn
  import torch.profiler
  import torch.utils.hooks
label_desc: Use image node_id 13 for calling the _Profiler obj's underlying member method code with example usage: obj.__enter__() and returns: self