code: def forward(self, x, **kwargs):
      return self.linear(x)
  
imports: import unittest
  from argparse import Namespace
  import torch
  from baal.active import ActiveLearningDataset
  from pytorch_lightning import Trainer
  from baal.utils.ssl_module import SSLModule
  from torch import nn
  from torch.utils.data import ConcatDataset
  from tests.utils.ssl_iterator_test import SSLTestDataset
label_desc: Use image node_id 2 for calling the TestSSLModule obj's underlying member method code with example usage: obj.forward(x) and returns: self