说明：  理解PLA算法和POCKET算法的原理及区别，在数据线性可分和数据线性不可分的情况下实习两算法，体会两算法在这两个数据集上的区别。
(Understand the principle and difference of PLA algorithm and pocketalgorithm, practice the two algorithms when the data is linearly separable and linearly inseparable, and experience the difference between the two algorithms on the two datasets.)