zoukankan      html  css  js  c++  java
  • PP: Triple-shapelet networks for time series classification

    Problem: time series classification

    shapelet-based method: two issues

    1. for multi-class imbalanced classification tasks, these methods will ignore the shapelets that can distinguish minority class from other classes.

    2. the shapelets are fixed after the training phase and cannot adapt to time series with deformation. 

    They propose a shapelet learning model: triple shapelet networks. 

    the imbalance of shapelets in minority class and majority class, to address this issue:

    they use category-level and sample-level shapelets to improve the performance. 

    classification is to find the best discriminating features. 

    Introduction:

    Shapelets are discriminative subsequences of time series data. They are suitable for TSC tasks since different classes often can be distinguished by their local patterns rather than their global structure.

    1. calculate the distances of shapelets and use these distances as discriminative features for classification. 

    shapelet transformation: find the top-k shapelets in a single pass. 

    to address two issues:

    1. imbalance features issue:

    they learn both types of features: dataset-level features and category-specific features. 

    2. deformation issue:

    Hence it would be useful to have shapelets that are specific to the data being processed. Here, it is reasonable to use a shapelet generator that is driven by the data itself to produce sample-specific shapelets.

    Three-types of shapelets: dataset-level; category-level; sample-specific level; use these three shapelets to conduct shapelet transformation and extract the discriminative features. 

    Thinking about:

    1. does this classification method is influenced by imbalanced datasets? and how?

    whether the method tends to ignore the feature of the minority categories? and only learns the features of majority categories?

  • 相关阅读:
    SQLAlchemy(2) -- SQLAlchemy的安装
    SQLAlchemy(1) -- Python的SQLAlchemy和ORM
    http-proxy-middleware及express实现反向代理
    Vue项目中的http请求统一管理
    vue.js中如何使用scss
    Vue 相关开源项目库汇总
    Vue UI组件库
    route按需加载的3种方式:vue异步组件、es提案的import()、webpack的require.ensure()
    Npoi Web 项目中(XSSFWorkbook) 导出出现无法访问已关闭的流
    vuejs 和 element 搭建的一个后台管理界面
  • 原文地址:https://www.cnblogs.com/dulun/p/12267407.html
Copyright © 2011-2022 走看看