【预研】搜索引擎基础——inverted index(倒排索引)

￡神魔★判官ぃ 2022-07-15 09:43 208阅读 0赞

> 基础知识思考整理  
> [http://blog.csdn.net/aganlengzi/article/details/53130790][http_blog.csdn.net_aganlengzi_article_details_53130790]

inverted index：In computer science, an inverted index (also referred to as postings file or inverted file) is an index data structure storing a mapping from content, such as words or numbers, to its locations in a database file, or in a document or a set of documents (named in contrast to a Forward Index, which maps from documents to content).\[1\]

倒排索引：应该是翻译的锅了… … 感觉叫反向索引可能更好一点。  
常规的索引是文档到关键词的映射：文档——>关键词  
倒排索引是关键词到文档的映射：关键词——>文档  
之所以这么干是想通过关键词方便快捷地找到相关的文档，是搜索引擎的重要基础技术。

关于inverted index的具体原理，[这个][Link 1]里面讲得比较清楚。

\[1\] [https://en.wikipedia.org/wiki/Inverted\_index][https_en.wikipedia.org_wiki_Inverted_index]  
\[2\] [http://blog.csdn.net/malefactor/article/details/7256305][Link 1]  
\[2\] [https://www.zhihu.com/question/23202010/answer/23928943][https_www.zhihu.com_question_23202010_answer_23928943]

[http_blog.csdn.net_aganlengzi_article_details_53130790]: http://blog.csdn.net/aganlengzi/article/details/53130790
[Link 1]: http://blog.csdn.net/malefactor/article/details/7256305
[https_en.wikipedia.org_wiki_Inverted_index]: https://en.wikipedia.org/wiki/Inverted_index
[https_www.zhihu.com_question_23202010_answer_23928943]: https://www.zhihu.com/question/23202010/answer/23928943