docstr: sync weights of model to target model
          
docstr_tok: ["sync","weights","of","model","to","target","model"]
code: def sync_target(self):
      """sync weights of model to target model"""
      self.agent_model.sync_weights_to(self.target_agent_model)
      self.qmixer_model.sync_weights_to(self.target_qmixer_model)
  
file_path: PARL/parl/algorithms/fluid/qmix.py
imports: import parl
  import copy
  from copy import deepcopy
  from paddle.fluid import layers
  import paddle.fluid
label_desc: Use image node_id 4 for calling the QMIX obj's underlying member method code with example usage: obj.sync_target() without return types