code: def predict(self, obs):
      return self.model.policy(obs)
  
file_path: PARL/parl/algorithms/paddle/ddpg.py
imports: import parl
  import paddle
  import paddle.nn.functional
  from copy import deepcopy
  from parl.utils.utils import check_model_method
label_desc: Use image node_id 2 for calling the DDPG obj's underlying member method code with example usage: obj.predict(obs) and returns: self