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张人天 · 2020年03月14日

问一道题:NO.PZ2015120204000062 [ CFA II ]

问题如下:

Which of the following best describes dimension reduction? Dimension reduction:

选项:

A.

focuses on classifying observations in a data set into known groups using labeled training data.

B.

focuses on clustering observations in a data set into unknown groups using unlabeled data.

C.

focuses on reducing the number of features in a data set while retaining variation across observations to preserve the information in that variation.

解释:

选项B是什么意思啊。。。
1 个答案

星星_品职助教 · 2020年03月14日

同学你好,

B选项是“clustering”方法的定义。就是将无标签的数据用聚类算法来进行分类。C选项才是降维算法的正确描述