code: def value(self, obs):
      h1 = self.fc1(obs)
      h2 = self.fc2(h1)
      Q = self.fc3(h2)
      return Q
  
imports: import paddle.fluid
  import parl
  from parl import layers
label_desc: Use image node_id 2 for calling the CartpoleModel obj's underlying member method code with example usage: obj.value(obs) and returns: Q