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(相同用户的17个中间修订版本未显示) |
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− | =check the detail of Lucene score= | + | =query = |
− | *data | + | *[[multi query in multi field]] |
− | d0 [{如何,怎么}} {办理,办} {户口,户口本} # 到当地派出所办理 # 如何办理户口
| + | * [[improved search method by rewrited query]] |
− | d1 {办理,办} {户口,户口本} [{流程,步骤}] # 到当地派出所办理 # 如何办理户口
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− | d2 [{如何,怎么}} {办理,办} {身份证,身份} # 到当地派出所办理 # 如何办理身份证
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− | d3 {办理,办} {身份证} [{流程,步骤}] # 到当地派出所办理 # 如何办理身份证
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− | *搜索
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− | query:"如何办理户口" => question:如何 question:办理户口
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− | *result
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− | doc=0 score=0.114656925 shardIndex=-1|0.114656925 = (MATCH) product of:
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− | 0.22931385 = (MATCH) sum of:
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− | 0.22931385 = (MATCH) weight(question:如何 in 0) [DefaultSimilarity], result of:
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− | 0.22931385 = score(doc=0,freq=1.0 = termFreq=1.0
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− | ), product of:
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− | 0.4748871 = queryWeight, product of:
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− | 1.287682 = idf(docFreq=2, maxDocs=4)
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− | 0.3687922 = queryNorm
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− | 0.48288077 = fieldWeight in 0, product of:
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− | 1.0 = tf(freq=1.0), with freq of:
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− | 1.0 = termFreq=1.0
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− | 1.287682 = idf(docFreq=2, maxDocs=4)
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− | 0.375 = fieldNorm(doc=0)
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− | 0.5 = coord(1/2)
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− | *详细计算流score(query,d0) | + | |
− | *参考公式:[http://lucene.apache.org/core/4_0_0/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html]
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− | [[文件:QQ截图20141128164958.png]]
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− | :* tf("如何" in d0)=sqrt{frequency}= sqrt{1}=1
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− | :* idf("如何")=<math>1+ln( {numDocs}/{docFreq+1})=1+ln( {4}/{2+1} )
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− | :* 如何".getboost=1
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− | :* coord(如何,d0) : 0.5 = coord(1/2)
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− | coord(t,d)=overlap /maxOverlap .
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− | overlap - the number of query terms matched in the document
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− | maxOverlap - the total number of terms in the query
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− | :* queryNorm(q)= 1/sqrt(sumOfSquaredWeights)=1/sqrt(sum(idf("如何")*1+idf("办理户口")))=1/sqrt(1*(1.287682*1.287682+2.386*2.386))=0.3687.
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− | sumOfSquaredWeights = q.getBoost()*q.getBoost()*∑( idf(t) *t.getBoost() )^2
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− | :* norm(t,d)
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− | norm("如何",d0)=
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