code: def test_dtensor_stride(self):
      device_mesh = DeviceMesh(
          self.device_type, list(range(self.world_size))
      )
      shard0_spec = [Shard(0)]
      local_tensor = torch.randn(4, 8)
      global_shape = torch.Size([self.world_size * 4, 8])
      dist_tensor = DTensor.from_local(
          local_tensor, device_mesh, shard0_spec
      )
      # won't affect stride
      self.assertEqual(dist_tensor.stride(), (8, 1))
  
      shard1_spec = [Shard(1)]
      local_tensor = torch.randn(8, 4)
      global_shape = torch.Size([8, self.world_size * 4])
      dist_tensor = DTensor.from_local(
          local_tensor, device_mesh, shard1_spec
      )
      # will affect stride after DT initialized
      self.assertEqual(dist_tensor.stride(), (4 * self.world_size, 1))
  
      # if initialized from a transposed mat
      local_tensor = torch.randn(8, 4, 8)
      local_tensor_t = local_tensor.permute(1, 2, 0)
      global_shape = torch.Size([4, self.world_size * 8, 8])
      self.assertEqual(local_tensor_t.stride(), (8, 1, 32))
      dist_tensor = DTensor.from_local(
          local_tensor_t, device_mesh, shard1_spec
      )
      global_stride = (8 * self.world_size, 1, 32 * self.world_size)
      self.assertEqual(dist_tensor.stride(), global_stride)
  
imports: import torch
  import torch.nn.functional
  from numpy.testing import assert_array_equal
  from torch.distributed._functional_collectives import AsyncCollectiveTensor
  from torch.distributed._tensor import DeviceMesh, distribute_tensor, DTensor, init_device_mesh
  from torch.distributed._tensor.placement_types import _Partial, Replicate, Shard
  from torch.distributed.tensor.parallel import ColwiseParallel, parallelize_module, RowwiseParallel
  from torch.testing._internal.common_utils import run_tests
  from torch.testing._internal.distributed._tensor.common_dtensor import DTensorTestBase, with_comms
label_desc: Use image node_id 4 for calling the DTensorTest obj's underlying member method code with example usage: obj.test_dtensor_stride() without return types