机器学习

介绍

无监督学习允许我们在处理问题时几乎不知道结果应该是什么样子，我们可以从数据中获得结构，而不必知道变量的作用。我们可以根据数据中变量之间的关系对数据进行聚类，从而得到这种结构。在无监督学习中，没有基于预测结果的反馈。也就是说，机器可以在你提供的数据中主动的去分析，总共有几类？哪些数据属于什么类？

What is Machine Learning?

Two definitions of Machine Learning are offered.

1. Arthur Samuel described it as: “the field of study that gives computers the ability to learn without being explicitly programmed.” This is an older, informal definition.

2. Tom Mitchell provides a more modern definition: “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.”