机器学习定义: A  computer program is said to leran from experience E with respect to some task T and some performance measure P, if it's performance on T, as measured by P, improves with experience E. 例: 垃圾邮件分类,T:将邮件按是否为垃圾邮件分类:E:观察标记过的邮件是否为垃圾邮件:P:正确分类的邮件的数…