code: def forward(self):
      return self.weight
  
file_path: fairscale/tests/nn/model_parallel/test_layers.py
imports: import os
  import pytest
  import torch
  import torch.nn.init
  from torch.nn.parameter import Parameter
  from fairscale.fair_dev.testing.testing import dist_init, set_random_seed, spawn_for_all_world_sizes
  from fairscale.nn.model_parallel import initialize
  from fairscale.nn.model_parallel import layers
label_desc: Use image node_id 2 for calling the IdentityLayer2D obj's underlying member method code with example usage: obj.forward() and returns: self