系统辨识的挑战不仅在于拟合数据,还在于提取有意义且可推广的模型。
The most important things in life often cannot be expressed in words.
行动是正确的,因为它们倾向于促进幸福;错误是因为它们倾向于产生与幸福相反的结果。
I'm not afraid to take an unpopular stand.