code: def Q1(self, obs, act):
      hid1 = self.fc1(obs)
      concat1 = layers.concat([hid1, act], axis=1)
      Q1 = self.fc2(concat1)
      Q1 = self.fc3(Q1)
      Q1 = layers.squeeze(Q1, axes=[1])
  
      return Q1
  
file_path: PARL/benchmark/fluid/TD3/mujoco_model.py
imports: import paddle.fluid
  import parl
  from parl import layers
label_desc: Use image node_id 3 for calling the CriticModel obj's underlying member method code with example usage: obj.Q1(obs, act) and returns: Q1