code: def get_variables(self, include_submodules=False, include_nontrainable=False):
          
          model_variables = super(QDemoModel, self).get_variables(
              include_submodules=include_submodules,
              include_nontrainable=include_nontrainable
          )
  
          if include_nontrainable:
              demo_memory_variables = self.demo_memory.get_variables()
              model_variables += demo_memory_variables
  
          return model_variables
docs: Returns the TensorFlow variables used by the model.
  
          Returns:
              List of variables.