code: def test_get_group(self):
      mesh_shape = (2, self.world_size // 2)
      mesh_2d = init_device_mesh(
          self.device_type, mesh_shape, mesh_dim_names=("dp", "tp")
      )
  
      tp_mesh = mesh_2d["tp"]
      dp_mesh = mesh_2d["dp"]
  
      self.assertEqual(len(mesh_2d.get_group()), 2)
      self.assertEqual(mesh_2d.get_group()[0], mesh_2d.get_group("dp"))
      self.assertEqual(mesh_2d.get_group()[1], mesh_2d.get_group("tp"))
  
      self.assertEqual(mesh_2d.get_group(0), mesh_2d.get_group("dp"))
      self.assertEqual(mesh_2d.get_group(1), mesh_2d.get_group("tp"))
  
      self.assertEqual(mesh_2d.get_group("dp"), dp_mesh.get_group())
      self.assertEqual(mesh_2d.get_group("tp"), tp_mesh.get_group())
  
imports: import os
  import torch
  import torch.distributed._functional_collectives
  from torch.distributed._tensor import DTensor
  from torch.distributed._tensor._collective_utils import mesh_all_to_all, mesh_broadcast, mesh_scatter
  from torch.distributed._tensor.placement_types import _Partial, Shard
  from torch.distributed.device_mesh import _mesh_resources, DeviceMesh, init_device_mesh
  from torch.distributed.distributed_c10d import get_global_rank, get_world_size, init_process_group, is_initialized, is_nccl_available, ProcessGroup
  from torch.testing._internal.common_utils import run_tests
  from torch.testing._internal.distributed._tensor.common_dtensor import DTensorTestBase, with_comms
  from torch.testing._internal.distributed.fake_pg import FakeStore
label_desc: Use image node_id 3 for calling the DeviceMeshTest obj's underlying member method code with example usage: obj.test_get_group() without return types