NotEvaluatedError# class NotEvaluatedError[source]# NotEvaluatedError. Exception class to raise if evaluator is used before having evaluated any metric. Attributes: args Methods with_traceback Exception.with_traceback(tb) -- set self.__traceback__ to tb and return self. with_traceback()[source]# Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.