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/Prioritized_DQN/per_alg.py
imports: import copy
  import numpy
  import paddle.fluid
  import parl
  from parl.core.fluid import layers
label_desc: Use image node_id 4 for calling the PrioritizedDQN obj's underlying member method code with example usage: obj.sync_target() without return types