code: def _get_gpu_id(device_id: int) -> str:
      """Get the unmasked real GPU IDs."""
      # All devices if `CUDA_VISIBLE_DEVICES` unset
      default = ",".join(str(i) for i in range(num_cuda_devices()))
      cuda_visible_devices = os.getenv(
          "CUDA_VISIBLE_DEVICES", default=default
      ).split(",")
      return cuda_visible_devices[device_id].strip()
  
imports: import logging
  import os
  import shutil
  import subprocess
  from typing import Any, Dict, List, Optional, Union
  import torch
  from typing_extensions import override
  import lightning.pytorch
  from lightning.fabric.accelerators import _AcceleratorRegistry
  from lightning.fabric.accelerators.cuda import _check_cuda_matmul_precision, _clear_cuda_memory, num_cuda_devices
  from lightning.fabric.utilities.device_parser import _parse_gpu_ids
  from lightning.fabric.utilities.types import _DEVICE
  from lightning.pytorch.accelerators.accelerator import Accelerator
  from lightning.pytorch.utilities.exceptions import MisconfigurationException
label_desc: Use image node_id 2 for calling a global function with example usage: _get_gpu_id(device_id) and returns: cuda_visible_devices