机器学习定义&分类

Machine Learning definition:

1. Arthur Samuel: Field of study that gives computers the ability to learn without being explicitly programmed.
2. 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..

ONE:  Supervised Learning 给出标准答案进行训练

regression problem 连续的

classification problem 离散的

TWO:  Learning Theory 

Three:  Unsupervised Learning  例如聚类问题

（通过图片建立3D模型）

这些数据有什么特殊结构

FOUR:  Reinforcement Learning 强化学习

reward function 

好的行为和坏的行为