On Tue, Oct 30, 2012 at 10:20 AM, parnab kumar <parnab.2...@gmail.com> wrote: > Hi all, > > Lucene 4 has introduced several state of the art ranking functions. I > was wondering how could i make use of those similarities .
IndexSearcher.setSimilarity(new XYZSimilarity()); > These models > obviously uses some more term and collection statistics as opposed to > the traditional Vector Space Model . I guess these statistics > are precomputed during indexing .Should there be any changes to the > indexing mechanism ,like specifying the indexing options to make use of > these models . >From the CHANGES.txt: "All models default to the same index-time norm encoding as DefaultSimilarity, so you can easily try these out/switch back and forth/run experiments and comparisons without reindexing. Note: most of the models do rely upon index statistics that are new in Lucene 4.0, so for existing 3.x indexes its a good idea to upgrade your index to the new format with IndexUpgrader first. " --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
