2010/11/18 Samuel Feng <[email protected]> > Hi, > > To my understanding, if you use one > Similarity in indexWriter, you should also use it in indexSearcher. > > And the scoring is not written during writing index, as it depends on the > relationship between query terms and the indexed documents. It is > calculated > for each query. >
But is it a benefit to use it in writer and/or searcher? Is the similarity needed at all during writing? > > > 2010/11/18 Mattias Persson <[email protected]> > > > > > Hi, > > > > > > > > > >> > > I am new to neo4j. > > >> > > > > >> > > I am using a custom analyzer in index in order to support Chinese. > > >> > > > > >> > > chnIndex = this.graphDb.index().forNodes("product_chinese", > > >> > > MapUtil.stringMap("analyzer", > > >> > > "org.wltea.analyzer.lucene.IKAnalyzer")); > > >> > > > > >> > > Below is the usage of the IKAnalyzer in lucence. > > >> > > > > >> > > IndexSearcher isearcher = new IndexSearcher(directory); > > >> > > isearcher.setSimilarity(new IKSimilarity()); // A custom > > >> > Similarity > > >> > > String word = "OLYMPUS 奥林巴斯 E-PL1 时尚白 微型4/3系统相机 套机 > 含14-42mm镜头"; > > >> > > Query query = IKQueryParser.parse(fieldName, word ); // A > > custom > > >> > > QueryParser > > >> > > TopDocs topDocs = isearcher.search(query, 5); // Got the top > 5 > > >> > > System.out.println("Found " + topDocs.totalHits); > > >> > > ScoreDoc[] scoreDocs = topDocs.scoreDocs; > > >> > > for (int i = 0; i < topDocs.totalHits; i++) { > > >> > > System.out.println(scoreDocs[i].score); // Got the score of > > >> each > > >> > > matched doc > > >> > > Document targetDoc = isearcher.doc(scoreDocs[i].doc); > > >> > > System.out.println("Document content is " + > > >> targetDoc.toString()); > > >> > > } > > >> > > > > >> > > How can I use the query method of neo4j's indexing to implement > > >> > > 1) Add my custom Similartiy implemtation > > >> > > > > > Btw, what's the difference between setting Similarity on IndexWriter vs. > > IndexSearcher? Is it performance maybe, that if it's set on the > IndexWriter > > then the scoring is written during writes, but if it's set on > IndexSearcher > > it's calculated for each query? > > _______________________________________________ > > Neo4j mailing list > > [email protected] > > https://lists.neo4j.org/mailman/listinfo/user > > > _______________________________________________ > Neo4j mailing list > [email protected] > https://lists.neo4j.org/mailman/listinfo/user > -- Mattias Persson, [[email protected]] Hacker, Neo Technology www.neotechnology.com _______________________________________________ Neo4j mailing list [email protected] https://lists.neo4j.org/mailman/listinfo/user
