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  • Lucene 查询权重排序因子解释(备查)


    tf(t in d):Term frequency factor for the term (t) in the document (d)—howmany times the term t occurs in the document.


    idf(t) :Inverse document frequency of the term: a measure of how“unique” the term is. Very common terms have a low idf; very rare terms have a high idf.


    boost(t.field in d): Field and document boost, as set during indexing (see section 2.5).You may use this to statically boost certain fields and certain documentsover others.


    lengthNorm(t.field in d): Normalization value of a field, given the number of terms within thefield. This value is computed during indexing and stored in the indexnorms. Shorter fields (fewer tokens) get a bigger boost from this factor.


    coord(q, d): Coordination factor, based on the number of query terms thedocument contains. The coordination factor gives an AND-like boost to documents that contain more of the search terms than other documents.


    queryNorm(q): Normalization value for a query, given the sum of the squared weights of each of the query terms.

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  • 原文地址:https://www.cnblogs.com/jinzhao/p/2182275.html
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