code: def _test_transformer(
      self, rank, group, config, use_no_sync_context=True
  ):
      model = self.get_wrapped_model(group, config=config, add_bn=False)
      model.eval()  # turn off dropout for the test
      self._test_grad_acc(
          model, batch_dim=1, use_no_sync_context=use_no_sync_context
      )
  
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 6 for calling the TestGradAcc obj's underlying member method code with example usage: obj._test_transformer(rank, group, config, use_no_sync_context) without return types