ch1 intro

def ML

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.

wiki：机器学习算法是一类从数据中自动分析获得规律，并利用规律对未知数据进行预测的算法。

监督学习：从数据集拟合数据

分类问题

连续型

回归问题

离散型

非监督学习

聚类算法，对没有标记的数据分类