斯坦福大学课程 机器学习1 关于机器学习的介绍_field of study that gives computers the ability to

第一种是Arthur Samuel在1959年提出的：“Field of study that gives computers the ability to learn without being explicitly programmed.”。 第二种是Tom Mitchell在1998年提出的，也是当前比较流行的定义：“A computer program is said to learn from experience E with respect to some task T and some performance measure P, if its performance on T, as measured by P, improves with experience E.”。

例如：玩西洋棋
E = the experience of playing many games of checkers
T = the task of playing checkers
P = the probability that the program will win the next game

监督学习：给定一组数据集，已知输入值及输出值，就是已知输入值及输出值的关系，使得算法学习该组数据集的过程。
根据输出值，可将监督学习分为回归和分类。

回归问题中，我们尝试预测连续的输出值，就是说输入变量到输出变量的映射为连续函数，则