成本不是为了计算而存在的,而是为了被降低而存在的。
学习算法的成功取决于其在拟合数据和避免过拟合之间取得平衡的能力。
The only limits you have are the limits you believe.
No individual has any right to come into the world and go out of it without leaving behind him distinct and legitimate reasons for having passed through it.