code: def update_profilers_on_step(self) -> None:
      for p in self.profilers:
          if (
              p.iter_begin <= self.done_steps
              and self.done_steps < p.iter_end
          ):
              if p.object is None:
                  o = p.cls(self)
                  logging.info(f"Starting {p.cls.__name__} profiler...")
                  o.__enter__()
                  p.object = o
              else:
                  p.object.step()
          else:
              if p.object is not None:
                  o = p.object
                  p.object = None
                  logging.info(
                      f"Shutting down {p.cls.__name__} profiler..."
                  )
                  o.__exit__(None, None, None)
  
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 3 for calling the _Profiler obj's underlying member method code with example usage: obj.update_profilers_on_step() without return types