code: def sync_target(self):
      self.model.sync_weights_to(self.target_model)
  
file_path: PARL/parl/algorithms/paddle/ddqn.py
imports: import copy
  import parl
  import paddle
  from parl.utils.utils import check_model_method
label_desc: Use image node_id 4 for calling the DDQN obj's underlying member method code with example usage: obj.sync_target() without return types