class_docstr: Google TPU accelerators.
code: def get_current_process_visible_accelerator_ids() -> (
      Optional[List[str]]
  ):
      tpu_visible_chips = os.environ.get(
          TPUAcceleratorManager.get_visible_accelerator_ids_env_var(),
          None,
      )
  
      if tpu_visible_chips is None:
          return None
  
      if tpu_visible_chips == "":
          return []
  
      return list(tpu_visible_chips.split(","))
  
imports: import os
  import re
  import glob
  import requests
  import logging
  from typing import Dict, Optional, List, Tuple
  from ray._private.accelerators.accelerator import AcceleratorManager
label_desc: Use image node_id 3 for calling the TPUAcceleratorManager obj's underlying member method code with example usage: obj.get_current_process_visible_accelerator_ids() and returns: list, None, list