code: def to_dict(self):
          
          input_dict = super(Constant, self)._save_to_input_dict()
          input_dict["class"] = "GPy.mappings.Constant"
          input_dict["value"] = self.C.values[0]
          return input_dict
docs: Convert the object into a json serializable dictionary.
  
          Note: It uses the private method _save_to_input_dict of the parent.
  
          :return dict: json serializable dictionary containing the needed information to instantiate the object