机器学习1-定义

A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P, if its performance at tasks in T, as measured by P, improves with experience E

好比垃圾邮件过滤：

T：把邮件按垃圾邮件非垃圾邮件分类。

E：观察用户把哪些邮件标记为垃圾邮件。

P：垃圾邮件分类的准确率。