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sebastian L. commented on LUCENE-3440: -------------------------------------- Hi Koji, bq. I committed LUCENE-4107 in trunk and branch_4x. That was fast! ;) https://issues.apache.org/jira/browse/LUCENE-4113 This one introduced and maintains IDF-weight for FieldTermStack.TermInfo. > FastVectorHighlighter: IDF-weighted terms for ordered fragments > ---------------------------------------------------------------- > > Key: LUCENE-3440 > URL: https://issues.apache.org/jira/browse/LUCENE-3440 > Project: Lucene - Java > Issue Type: Improvement > Components: modules/highlighter > Reporter: sebastian L. > Priority: Minor > Labels: FastVectorHighlighter > Fix For: 4.0 > > Attachments: LUCENE-3440.patch, LUCENE-3440.patch, LUCENE-3440.patch, > LUCENE-3440_3.6.1-SNAPSHOT.patch, LUCENE-4.0-SNAPSHOT-3440-9.patch, > weight-vs-boost_table01.html, weight-vs-boost_table02.html > > > The FastVectorHighlighter uses for every term found in a fragment an equal > weight, which causes a higher ranking for fragments with a high number of > words or, in the worst case, a high number of very common words than > fragments that contains *all* of the terms used in the original query. > This patch provides ordered fragments with IDF-weighted terms: > total weight = total weight + IDF for unique term per fragment * boost of > query; > The ranking-formula should be the same, or at least similar, to that one used > in org.apache.lucene.search.highlight.QueryTermScorer. > The patch is simple, but it works for us. > Some ideas: > - A better approach would be moving the whole fragments-scoring into a > separate class. > - Switch scoring via parameter > - Exact phrases should be given a even better score, regardless if a > phrase-query was executed or not > - edismax/dismax-parameters pf, ps and pf^boost should be observed and > corresponding fragments should be ranked higher -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org