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Problem: how to cluster non-stationary multivariate time series. 

What are stationary time series

How to consider both global features and local features? 

 

Supplementary Knowledge:

1. 聚类评价指标的好坏:

首先必须明确一点,下述的聚类效果好坏的评价指标只与聚类后的类别标签有关。换句话说,就是判断聚类算法给每个数据的类别标签与真实标签的一致性程度。虽说聚类是无监督学习,但评价指标均需要用到类别标签

下面分别介绍目前常用的评价指标:

  • Purity (纯度)
  • Normalized Mutual Information (NMI,归一化互信息)
  • Entropy(熵值)
  • True Positive (TP)、False Positive (FP)、False Positive (FP)、True Negative (TN)
  • Rand index (RI,兰德指数)
  • F measure

 

posted @ 2020-02-13 23:50  keeps_you_warm  阅读(126)  评论(0编辑  收藏  举报