code: def get_variables(self, include_nontrainable=False):
          
          if include_nontrainable:
              return [self.all_variables[key] for key in sorted(self.all_variables)]
          else:
              return [self.variables[key] for key in sorted(self.variables)]
docs: Returns the TensorFlow variables used by the baseline.
  
          Returns:
              List of variables