code: def world_size(self):
      return NUM_DEVICES
  
file_path: pytorch/test/distributed/tensor/parallel/test_tp_style.py
imports: from copy import deepcopy
  import torch
  import torch.nn
  from torch.distributed._tensor import Replicate, Shard, init_device_mesh
  from torch.distributed._tensor.debug import CommDebugMode
  from torch.distributed.tensor.parallel import parallelize_module
  from torch.distributed.tensor.parallel.style import ColwiseParallel, PrepareModuleInput, PrepareModuleOutput, RowwiseParallel
  from torch.testing._internal.common_utils import run_tests
  from torch.testing._internal.distributed._tensor.common_dtensor import DTensorTestBase, with_comms, NUM_DEVICES
label_desc: Use image node_id 1 for calling the TensorParallelStyleTest obj's underlying member method code with example usage: obj.world_size() and returns: NUM_DEVICES