LDA的一篇介绍。　LDA的全称是Linear Discriminant Analysis（线性判别分析），是一种supervised learning。LDA是在目前机器学习、数据挖掘领域经典且热门的一个算法(An introduction to LDA. LDA's full name is Linear Discriminant Analysis (Linear Discriminant Analysis), is a supervised learning. LDA is a classic and popular algorithm in the field of machine learning and data mining)