PAC学习框架提供了一种形式化的方法来量化概念类的可学习性。
The PAC learning framework provides a formal way to quantify the learnability of a concept class.
每个人的生活都是由许多日子组成的，日复一日。我们在自己之中行走，遇见强盗、幽灵、巨人、老人、年轻人、妻子、寡妇、相爱的兄弟，但总是遇见我们自己。
Just be yourself, there is no one better.
The idea is to make something that has never been seen before.
The elements are the alphabet of nature, and we are learning to read.