BM25

https://www.jianshu.com/p/1e498888f505
https://zhuanlan.zhihu.com/p/79202151
https://www.cnblogs.com/NaughtyBaby/p/9774836.html
https://www.elastic.co/guide/cn/elasticsearch/guide/current/pluggable-similarites.html#img-bm25-saturation
https://en.wikipedia.org/wiki/Okapi_BM25
https://my.oschina.net/stanleysun/blog/1617727
https://www.lishaowei.cn/1122.html
http://qianjiasong.com/post/nlp-tf-idf-bm25/

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来源： https://www.cnblogs.com/baisheng/p/13945797.html