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[机器学习] 如何从一堆标签中提取出层级分类

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例如，现在有 N 本书，每本书有若干个标签如下：

  1. 电子商务－网站－高等学校－教材
  2. 经济学－通俗读物
  3. 故事－作品集－中国－当代
  4. 人物－列传－浙江省
  5. ...

最终通过算法得到二级分类：

|-教材
  |-电子商务
  |-经济学
|-作品集
  |-故事
  |-列传

有什么办法能找到这种层级关系吗？

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