code: def test_transformer(self):
      fn = functools.partial(self._test_transformer, config={})
      spawn_and_init(fn)
  
imports: import contextlib
  import functools
  import itertools
  import unittest
  from unittest.mock import patch
  from parameterized import parameterized
  import torch
  from fairscale.fair_dev.testing.testing import DummyProcessGroup, make_cudnn_deterministic, objects_are_equal
  from fairscale.nn.data_parallel import FullyShardedDataParallel
  from .test_fsdp import DistributedTest, NestedWrappedModule, rename_test, spawn_and_init
label_desc: Use image node_id 1 for calling the TestGradAcc obj's underlying member method code with example usage: obj.test_transformer() without return types