code: def forward(self, x: torch.Tensor):
      return x
  
file_path: MONAI/tests/test_prepare_batch_default_dist.py
imports: from __future__ import annotations
  import unittest
  import torch
  import torch.distributed
  from parameterized import parameterized
  from monai.engines import PrepareBatchDefault, SupervisedEvaluator
  from tests.utils import DistCall, DistTestCase, assert_allclose
label_desc: Use image node_id 1 for calling the TestNet obj's underlying member method code with example usage: obj.forward(x) and returns: x