Thanks Uwe,could you please give me a more detail example about how to change the lucene behavior
Uwe Schindler wrote > Hi Erick, > > a statement like " Adding &debug=all to the query will show you if this is > the case" will not help a Lucene user, as it is only available in the Solr > server. But Andy uses Lucene directly. In his case he should use > IndexSearcher's explain functionalities to retrieve a structured output of > how the documents are scored for this query for debugging: > > http://lucene.apache.org/core/4_6_0/core/org/apache/lucene/search/IndexSearcher.html#explain(org.apache.lucene.search.Query, > int) > > But yes, the length norm is encoded with loss of precsision in Lucene (it > is a float values encoded to 1 byte only). With Lucene 4 there are ways to > change that behavior, but that included changing the similarity > implementation and use a different DocValues type for encoding the norms. > In most cases this is not needed, because user won't notice. > > Uwe > > ----- > Uwe Schindler > H.-H.-Meier-Allee 63, D-28213 Bremen > http://www.thetaphi.de > eMail: > uwe@ > > >> -----Original Message----- >> From: Erick Erickson [mailto: > erickerickson@ > ] >> Sent: Wednesday, January 15, 2014 1:30 PM >> To: java-user >> Subject: Re: Length of the filed does not affect the doc score accurately >> for >> chinese analyzer(SmartChineseAnalyzer) >> >> the lengths of fields are encoded and lose some precision. So I suspect >> the >> length of the field calculated for the two documents are the same after >> encoding. >> >> Adding &debug=all to the query will show you if this is the case. >> >> Best >> Erick >> >> On Wed, Jan 15, 2014 at 3:39 AM, andy < > yhlweb@ > > wrote: >> > Hi guys, >> > >> > As the topic,it seems that the length of filed does not affect the doc >> > score accurately for chinese analyzer in my source code >> > >> > index source code >> > >> > private static Directory DIRECTORY; >> > >> > >> > @BeforeClass >> > public static void before() throws IOException { >> > DIRECTORY = new RAMDirectory(); >> > Analyzer chineseanalyzer = new >> > SmartChineseAnalyzer(Version.LUCENE_40); >> > IndexWriterConfig indexWriterConfig = new >> > IndexWriterConfig(Version.LUCENE_40,chineseanalyzer); >> > FieldType nameType = new FieldType(); >> > nameType.setIndexed(true); >> > nameType.setStored(true); >> > nameType.setOmitNorms(false); >> > try { >> > IndexWriter indexWriter = new IndexWriter(DIRECTORY, >> > indexWriterConfig); >> > >> > List > <String> > nameList = new ArrayList > <String> > (); >> > >> > nameList.add("咨询公司");nameList.add("飞鹰咨询管理咨询公司 >> ");nameList.add("北京中标咨询公司");nameList.add("重庆咨询公司 >> ");nameList.add("商务咨询服务公司");nameList.add("法律咨询公司"); >> > for (int i = 0; i < nameList.size(); i++) { >> > Document document = new Document(); >> > document.add(new Field("name", nameList.get(i), >> > nameType)); >> > document.add(new >> > Field("id",String.valueOf(i+1),nameType)); >> > indexWriter.addDocument(document); >> > } >> > indexWriter.commit(); >> > } catch (IOException e) { >> > // TODO Auto-generated catch block >> > e.printStackTrace(); >> > } >> > } >> > >> > search snippet: >> > @Test >> > public void testChinese() throws IOException, ParseException { >> > String keyword = "咨询公司"; >> > System.out.println("Searching for:" + keyword); >> > System.out.println(); >> > IndexReader indexReader = DirectoryReader.open(DIRECTORY); >> > IndexSearcher indexSearcher = new IndexSearcher(indexReader); >> > Query query = null; >> > query = new QueryParser(Version.LUCENE_40,"name",new >> > SmartChineseAnalyzer(Version.LUCENE_40)).parse(keyword); >> > TopDocs topDocs = indexSearcher.search(query,15); >> > System.out.println("Search Result:"); >> > if (null !=topDocs && 0 < topDocs.totalHits) { >> > for (ScoreDoc scoreDoc : topDocs.scoreDocs) { >> > System.out.println("doc id:" + >> > indexSearcher.doc(scoreDoc.doc).get("id")); >> > String name = >> indexSearcher.doc(scoreDoc.doc).get("name"); >> > System.out.println("content of Field:" + name); >> > dumpCNTokens(name); >> > System.out.println("score:" + scoreDoc.score); >> > >> > System.out.println("-------------------------------------------"); >> > } >> > } else { >> > System.out.println("no results"); >> > } >> > >> > } >> > >> > >> > And search result as follows: >> > Searching for:咨询公司 >> > >> > Search Result: >> > doc id:1 >> > content of Field:咨询公司 >> > Terms:咨询 公司 >> > score:0.74763227 >> > ------------------------------------------- >> > doc id:2 >> > content of Field:飞鹰咨询管理咨询公司 >> > Terms:飞鹰 咨询 管理 咨询 公司 >> > score:0.6317303 >> > ------------------------------------------- >> > doc id:3 >> > content of Field:北京中标咨询公司 >> > Terms:北京 中标 咨询 公司 >> > score:0.5981058 >> > ------------------------------------------- >> > doc id:4 >> > content of Field:重庆咨询公司 >> > Terms:重庆 咨询 公司 >> > score:0.5981058 >> > ------------------------------------------- >> > doc id:5 >> > content of Field:商务咨询服务公司 >> > Terms:商务 咨询 服务 公司 >> > score:0.5981058 >> > ------------------------------------------- >> > doc id:6 >> > content of Field:法律咨询公司 >> > Terms:法律 咨询 公司 >> > score:0.5981058 >> > ------------------------------------------- >> > >> > docs:3,4,5,6 have the same score, but I think the doc 4 and doc 6 >> > should have a higner score than the doc 3,5, becase the doc 4 and doc >> > 6 have three terms ,doc 3,5 have four terms. >> > Am I right? who can give me a explanation? And how to get the expected >> > result? >> > >> > >> > >> > -- >> > View this message in context: >> > http://lucene.472066.n3.nabble.com/Length-of-the-filed-does-not-affect >> > -the-doc-score-accurately-for-chinese-analyzer-SmartChineseAnalyz-tp41 >> > 11390.html Sent from the Lucene - Java Users mailing list archive at >> > Nabble.com. >> > >> > --------------------------------------------------------------------- >> > To unsubscribe, e-mail: > java-user-unsubscribe@.apache >> > For additional commands, e-mail: > java-user-help@.apache >> > >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: > java-user-unsubscribe@.apache >> For additional commands, e-mail: > java-user-help@.apache > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: > java-user-unsubscribe@.apache > For additional commands, e-mail: > java-user-help@.apache -- View this message in context: http://lucene.472066.n3.nabble.com/Length-of-the-filed-does-not-affect-the-doc-score-accurately-for-chinese-analyzer-SmartChineseAnalyz-tp4111390p4116850.html Sent from the Lucene - Java Users mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
