Solr で 2 つのドキュメントを作成しました。
<doc>
<float name="score">1.00711</float>
<str name="_id">ejn01:2560000000075596</str>
<str name="title">Journal of neurology research</str>
</doc>
<doc>
<float name="score">1.00711</float>
<str name="_id">ejn01:954925518616</str>
<str name="title">Journal of neurology</str>
</doc>
フィールド「タイトル」は、schema.xml で次のように定義されています。
<fieldType name="utf8text" class="solr.TextField" positionIncrementGap="100" omitNorms="false">
<analyzer type="index">
<tokenizer class="solr.StandardTokenizerFactory" maxTokenLength="1024"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.ASCIIFoldingFilterFactory"/>
<filter class="solr.SynonymFilterFactory" synonyms="index_synonyms.txt" format="solr" ignoreCase="false" expand="true" tokenizerFactory="solr.WhitespaceTokenizerFactory"/>
</analyzer>
<analyzer type="query">
<tokenizer class="solr.StandardTokenizerFactory" maxTokenLength="1024"/>
<filter class="solr.LowerCaseFilterFactory"/>
<filter class="solr.ASCIIFoldingFilterFactory"/>
<filter class="solr.SynonymFilterFactory" synonyms="index_synonyms.txt" format="solr" ignoreCase="false" expand="true" tokenizerFactory="solr.WhitespaceTokenizerFactory"/>
</analyzer>
</fieldType>
"journal of neurology"というクエリを使用すると、両方のドキュメントのスコアは同じですが、2 番目のドキュメントの方が正確です。フレーズ クエリを指定しても問題は解決しません。また、計算されたfieldNorm が両方のドキュメントで「0.5」であることもわかります。これは、長さのノルムを 1 バイトに格納するときに精度が失われることと関係がありますか?
以下は、提供されているすべてのパラメーターです (solrconfig.xml のデフォルト)。
<str name="lowercaseOperators">false</str>
<str name="mm">-10%</str>
<str name="pf">author^3 title^2</str>
<str name="sort">score desc</str>
<arr name="bq">
<str>source:ser01^10</str>
<str>source:ejn01^10</str>
<str>(*:* -type:article)^999</str>
</arr>
<str name="echoParams">all</str>
<str name="df">all</str>
<str name="tie">0</str>
<str name="qf">
author^15 title^10 subject^1 summary^1 library^1 location^1 publisher^1 place_published^1 issn^1 isbn^1
</str>
<str name="q.alt">*:*</str>
<str name="ps">2</str>
<str name="defType">edismax</str>
<str name="q">journal of neurology</str>
<str name="echoParams">all</str>
<str name="sort">score desc</str>
スコアの計算を見ると、それらの間に単一の違いは見られません
<str name="ejn01:2560000000075596">
1.0071099 = (MATCH) sum of:
0.0053001107 = (MATCH) sum of:
0.0017667036 = (MATCH) max of:
0.0017667036 = (MATCH) weight(title:journal^10.0 in 0), product of:
0.005943145 = queryWeight(title:journal^10.0), product of:
10.0 = boost
0.5945349 = idf(docFreq=2, maxDocs=2)
9.996294E-4 = queryNorm
0.29726744 = (MATCH) fieldWeight(title:journal in 0), product of:
1.0 = tf(termFreq(title:journal)=1)
0.5945349 = idf(docFreq=2, maxDocs=2)
0.5 = fieldNorm(field=title, doc=0)
0.0017667036 = (MATCH) max of:
0.0017667036 = (MATCH) weight(title:of^10.0 in 0), product of:
0.005943145 = queryWeight(title:of^10.0), product of:
10.0 = boost
0.5945349 = idf(docFreq=2, maxDocs=2)
9.996294E-4 = queryNorm
0.29726744 = (MATCH) fieldWeight(title:of in 0), product of:
1.0 = tf(termFreq(title:of)=1)
0.5945349 = idf(docFreq=2, maxDocs=2)
0.5 = fieldNorm(field=title, doc=0)
0.0017667036 = (MATCH) max of:
0.0017667036 = (MATCH) weight(title:neurology^10.0 in 0), product of:
0.005943145 = queryWeight(title:neurology^10.0), product of:
10.0 = boost
0.5945349 = idf(docFreq=2, maxDocs=2)
9.996294E-4 = queryNorm
0.29726744 = (MATCH) fieldWeight(title:neurology in 0), product of:
1.0 = tf(termFreq(title:neurology)=1)
0.5945349 = idf(docFreq=2, maxDocs=2)
0.5 = fieldNorm(field=title, doc=0)
0.0031800664 = (MATCH) max of:
0.0031800664 = (MATCH) weight(title:"journal of neurology"~2^2.0 in 0), product of:
0.0035658872 = queryWeight(title:"journal of neurology"~2^2.0), product of:
2.0 = boost
1.7836046 = idf(title: journal=2 of=2 neurology=2)
9.996294E-4 = queryNorm
0.8918023 = fieldWeight(title:"journal of neurology" in 0), product of:
1.0 = tf(phraseFreq=1.0)
1.7836046 = idf(title: journal=2 of=2 neurology=2)
0.5 = fieldNorm(field=title, doc=0)
0.99862975 = (MATCH) sum of:
0.99862975 = (MATCH) MatchAllDocsQuery, product of:
0.99862975 = queryNorm
</str>
<str name="ejn01:954925518616">
1.0071099 = (MATCH) sum of:
0.0053001107 = (MATCH) sum of:
0.0017667036 = (MATCH) max of:
0.0017667036 = (MATCH) weight(title:journal^10.0 in 1), product of:
0.005943145 = queryWeight(title:journal^10.0), product of:
10.0 = boost
0.5945349 = idf(docFreq=2, maxDocs=2)
9.996294E-4 = queryNorm
0.29726744 = (MATCH) fieldWeight(title:journal in 1), product of:
1.0 = tf(termFreq(title:journal)=1)
0.5945349 = idf(docFreq=2, maxDocs=2)
0.5 = fieldNorm(field=title, doc=1)
0.0017667036 = (MATCH) max of:
0.0017667036 = (MATCH) weight(title:of^10.0 in 1), product of:
0.005943145 = queryWeight(title:of^10.0), product of:
10.0 = boost
0.5945349 = idf(docFreq=2, maxDocs=2)
9.996294E-4 = queryNorm
0.29726744 = (MATCH) fieldWeight(title:of in 1), product of:
1.0 = tf(termFreq(title:of)=1)
0.5945349 = idf(docFreq=2, maxDocs=2)
0.5 = fieldNorm(field=title, doc=1)
0.0017667036 = (MATCH) max of:
0.0017667036 = (MATCH) weight(title:neurology^10.0 in 1), product of:
0.005943145 = queryWeight(title:neurology^10.0), product of:
10.0 = boost
0.5945349 = idf(docFreq=2, maxDocs=2)
9.996294E-4 = queryNorm
0.29726744 = (MATCH) fieldWeight(title:neurology in 1), product of:
1.0 = tf(termFreq(title:neurology)=1)
0.5945349 = idf(docFreq=2, maxDocs=2)
0.5 = fieldNorm(field=title, doc=1)
0.0031800664 = (MATCH) max of:
0.0031800664 = (MATCH) weight(title:"journal of neurology"~2^2.0 in 1), product of:
0.0035658872 = queryWeight(title:"journal of neurology"~2^2.0), product of:
2.0 = boost
1.7836046 = idf(title: journal=2 of=2 neurology=2)
9.996294E-4 = queryNorm
0.8918023 = fieldWeight(title:"journal of neurology" in 1), product of:
1.0 = tf(phraseFreq=1.0)
1.7836046 = idf(title: journal=2 of=2 neurology=2)
<b>0.5 = fieldNorm(field=title, doc=1)
0.99862975 = (MATCH) sum of:
0.99862975 = (MATCH) MatchAllDocsQuery, product of:
0.99862975 = queryNorm
</str>
fieldNorm が両方のドキュメントで同じである理由は何ですか?
前もって感謝します！