code: def test_invalid_device(self):
      dev = "not a real device"
      msg = f"unsupported autocast device_type '{dev}'"
      with self.assertRaisesRegex(RuntimeError, msg):
          with torch.autocast(device_type=dev):
              _ = torch.tensor(1)
  
imports: import collections
  import unittest
  import torch
  from torch.testing._internal.common_utils import TestCase, run_tests, IS_WINDOWS, skipIfTorchDynamo
  from torch.testing._internal.autocast_test_lists import AutocastCPUTestLists
  from torch.utils._python_dispatch import TorchDispatchMode
label_desc: Use image node_id 2 for calling the TestTorchAutocast obj's underlying member method code with example usage: obj.test_invalid_device() without return types