code: def forward(self, obs):
      hid1 = self.fc1(obs)
      hid2 = self.fc2(hid1)
      means = self.fc3(hid2)
      return means
  
imports: import paddle.fluid
  import parl
  from parl import layers
label_desc: Use image node_id 2 for calling the MujocoModel obj's underlying member method code with example usage: obj.forward(obs) and returns: means