machine learning definition
· Arthur Samuel(1959). machine learning: filed of study that gives computers the ability to learn without being explicitly programmed. (写了个跳棋程序）
· Tom Mitchell(1988). Well-posed learning Problem : 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.
Supervised learning
· regression problem
· classification problem
Unsupervised learning
· clustering algorithm