code: def sync_target(self, decay=None):
      if decay is None:
          decay = 1.0 - self.tau
      self.model.sync_weights_to(self.target_model, decay=decay)
  
file_path: PARL/parl/algorithms/paddle/td3.py
imports: import parl
  import paddle
  import paddle.nn.functional
  from parl.utils.utils import check_model_method
  from copy import deepcopy
label_desc: Use image node_id 6 for calling the TD3 obj's underlying member method code with example usage: obj.sync_target(decay) without return types