code: def predict(self, obs):
      obs = obs.astype("float32")
      obs = np.expand_dims(obs, axis=0)
      act = self.fluid_executor.run(
          program=self.predict_program,
          feed={"obs": obs},
          fetch_list=[self.predict_action],
      )[0]
      return act
  
file_path: PARL/benchmark/fluid/ES/mujoco_agent.py
imports: import numpy
  import paddle.fluid
  import parl
  import utils
  from parl import layers
  from optimizers import Adam
label_desc: Use image node_id 4 for calling the MujocoAgent obj's underlying member method code with example usage: obj.predict(obs) and returns: act