code: def forward(self, obs):
      out = self.fc1(obs)
      out = self.bn(out)
      out = self.fc2(out)
      return out
  
imports: import numpy
  import unittest
  import os
  import torch
  import torch.nn
  import torch.optim
  import parl
label_desc: Use image node_id 2 for calling the TestModelWithBN obj's underlying member method code with example usage: obj.forward(obs) and returns: out