code: def apply_shadow(self):
      self.backup = self.get_model_state()
      self.model.set_dict(self.shadow)
  
file_path: PaddleSeg/contrib/DomainAdaptation/models/ema.py
label_desc: Use image node_id 4 for calling the EMA obj's underlying member method code with example usage: obj.apply_shadow() without return types