code: def test_num_stepping_batches_with_tpu_multi():
      """Test stepping batches with the TPU strategy across multiple devices."""
      trainer = Trainer(accelerator="tpu", devices="auto", max_epochs=1)
      model = MultiprocessModel()
      trainer.fit(model)
  
imports: import logging
  import os
  from unittest import mock
  import pytest
  import torch
  from lightning.pytorch import Trainer
  from lightning.pytorch.demos.boring_classes import BoringModel, RandomIterableDataset
  from lightning.pytorch.strategies import SingleDeviceXLAStrategy
  from torch.utils.data import DataLoader
  from tests_pytorch.conftest import mock_cuda_count
  from tests_pytorch.helpers.runif import RunIf
label_desc: Use image node_id 9 for calling a global function with example usage: test_num_stepping_batches_with_tpu_multi() without return types