code: def forward(self, x):
      return self.l1(x) + self.buffer
  
imports: import contextlib
  import os
  import re
  import subprocess
  import sys
  import unittest
  import torch
  import torch.nn.utils.stateless
  from torch.testing._internal.common_cuda import TEST_MULTIGPU
  from torch.testing._internal.common_utils import run_tests, TestCase, parametrize, instantiate_parametrized_tests, subtest
label_desc: Use image node_id 2 for calling the MockModule obj's underlying member method code with example usage: obj.forward(x) and returns: unknown