code: def _parse_tpu_devices_str(devices: str) -> Union[int, List[int]]:
      devices = devices.strip()
      try:
          return int(devices)
      except ValueError:
          try:
              return [
                  int(x.strip())
                  for x in devices.split(",")
                  if len(x) > 0
              ]
          except ValueError:
              raise ValueError(
                  f"Could not parse the selected TPU devices: {devices!r}"
              )
  
imports: import functools
  from typing import Any, List, Union
  import torch
  from lightning_utilities.core.imports import RequirementCache
  from typing_extensions import override
  from lightning.fabric.accelerators.accelerator import Accelerator
  from lightning.fabric.accelerators.registry import _AcceleratorRegistry
  from lightning.fabric.utilities.device_parser import _check_data_type
label_desc: Use image node_id 4 for calling a global function with example usage: _parse_tpu_devices_str(devices) and returns: int, unknown