docstr: sync weights of self.model to self.target_model
          
docstr_tok: ["sync","weights","of","self.model","to","self.target_model"]
code: def sync_target(self):
      """sync weights of self.model to self.target_model"""
      self.model.sync_weights_to(self.target_model)
  
file_path: PARL/benchmark/fluid/offline-Q-learning/dqn.py
imports: import warnings
  import copy
  import paddle.fluid
  from parl.core.fluid.algorithm import Algorithm
  from parl.core.fluid import layers
label_desc: Use image node_id 6 for calling the DQN obj's underlying member method code with example usage: obj.sync_target() without return types