Thank you for the response. I logged a bug https://issues.apache.org/jira/browse/LUCENE-1087
-----Original Message----- From: Chris Hostetter [mailto:[EMAIL PROTECTED] Sent: Friday, December 07, 2007 10:30 PM To: java-user@lucene.apache.org Subject: Re: does the MultiSearcher class calculate IDF properly? a quick glance at the code seems to indicate that MultiSearcher has code for calcuating the docFreq accross all of the Searchables when searching (or when the docFreq method is explicitly called) but that explain method just delegates to Searchable that the specific docid came from. if you compare that Explanation score you got with the score returned by a HitCollector (or TopDocs) they probably won't match. So i would say "yes MultiSearcher calculates IDF properly, but MultiSeracher.explain is broken. Please file a bug about this, i can't think of an easy way to fix it, but it certianly seems broken to me. : Subject: does the MultiSearcher class calculate IDF properly? : : I tried the following. Creating 2 different indexes, search each : individually and print score details and compare to searching both : indexes with MulitSearcher and printing score details. : : The "docFreq" value printed don't seem right - is this just a problem : with using Explain together with the MultiSearcher? : : : Code is like: : MultiSearcher multi = new MultiSearcher(searchables); : Hits hits = multi.search(query); : for(int i=0; i<hits.length(); i++) : { : Explanation expl = multi.explain(query, hits.id(i)); : System.out.println(expl.toString()); : } : : : Output: : id = 14 score = 0.071 : 0.07073946 = (MATCH) fieldWeight(contents:climate in 2), product of: : 1.0 = tf(termFreq(contents:climate)=1) : 1.8109303 = idf(docFreq=1) : 0.0390625 = fieldNorm(field=contents, doc=2) : : --------------------------------------------------------------------- : To unsubscribe, e-mail: [EMAIL PROTECTED] : For additional commands, e-mail: [EMAIL PROTECTED] : -Hoss --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
