code: def forward(self, obs):
      out = self.fc1(obs)
      out = self.fc2(out)
      out = self.fc3(out)
      return out
  
imports: import numpy
  import unittest
  import paddle
  import paddle.nn
  import parl
  import os
label_desc: Use image node_id 2 for calling the TestModel obj's underlying member method code with example usage: obj.forward(obs) and returns: out