code: def policy(self, obs):
      hid1 = self.fc1(obs)
      hid2 = self.fc2(hid1)
      means = self.mean_linear(hid2)
      log_std = self.log_std_linear(hid2)
      log_std = layers.clip(log_std, min=LOG_SIG_MIN, max=LOG_SIG_MAX)
  
      return means, log_std
  
file_path: PARL/benchmark/fluid/SAC/mujoco_model.py
imports: import paddle.fluid
  import parl
  from parl import layers
label_desc: Use image node_id 2 for calling the ActorModel obj's underlying member method code with example usage: obj.policy(obs) and returns: means,  log_std