code: def forward(self, x):
      x = self.linear(x)
      x = x * 2
  
      return x
  
file_path: colossalai/tests/test_auto_parallel/test_tensor_shard/test_bias_addition_forward.py
imports: import pytest
  import torch
  from colossalai.device.device_mesh import DeviceMesh
  from colossalai.initialize import launch
  from colossalai.logging import disable_existing_loggers
  from colossalai.testing import assert_close, rerun_if_address_is_in_use, run_on_environment_flag, spawn
label_desc: Use image node_id 2 for calling the LinearModel obj's underlying member method code with example usage: obj.forward(x) and returns: x