code: def learn(self, obs, action, reward, next_obs, terminal):
      critic_loss = self._critic_learn(
          obs, action, reward, next_obs, terminal
      )
      actor_loss = self._actor_learn(obs)
  
      self.sync_target()
      return critic_loss, actor_loss
  
file_path: PARL/parl/algorithms/paddle/oac.py
imports: import parl
  import paddle
  from paddle.distribution import Normal
  import paddle.nn.functional
  from parl.utils.utils import check_model_method
  from copy import deepcopy
  import math
label_desc: Use image node_id 5 for calling the OAC obj's underlying member method code with example usage: obj.learn(obs, action, reward, next_obs, terminal) and returns: critic_loss,  actor_loss