code: def predict(self, obs):
      out = self.actor(obs)
      return out
  
imports: import numpy
  import paddle
  import paddle.nn
  import parl
  import unittest
  from copy import deepcopy
  from parl.core.paddle.model import Model
label_desc: Use image node_id 2 for calling the ACModel obj's underlying member method code with example usage: obj.predict(obs) and returns: out