code: def forward(self, x):
      return self.fwd(x)
  
imports: import copy
  import typing
  import unittest
  import torch
  import torch.nn
  from torch.testing._internal import common_utils
  from apex.transformer.testing.distributed_test_base import NcclDistributedTestBase
label_desc: Use image node_id 2 for calling the BNModel obj's underlying member method code with example usage: obj.forward(x) and returns: self