Thanks for the info. But do you know where this is actually perform in Lucene? I mean the method involved, that will calculate the value before storing it into the index. I track it to one method known as lengthNorm() in DefaultSimilarity.java, but the value is different from what is stored in the index
Doron Cohen-2 wrote: > > Norms information comes mainly from lengths of documents - allowing the > search time scoring to take into account the effect of document lengths > (actually > field length within a document). In practice, norms stored within the > index > may include > other information, such as index time boosts - for a document, for a > field. > A single > byte is stored for each field, - so for this the actual value is > compressed. > At search > time, norms are loaded into memory, and so consume 1 byte for each > document. > It is possible to disable norms for a field while indexing. This is > explained > better in the javadoc for Similarity, and here: > http://lucene.apache.org/java/2_3_2/scoring.html > > Doron > > On Mon, Aug 18, 2008 at 5:59 AM, blazingwolf7 > <[EMAIL PROTECTED]>wrote: > >> >> Hi, >> >> I am currently using Lucene for indexing. After a index a file, I will >> use >> LUKE to open it and check the index. And there is 1 part that I am >> curious >> about. In Luke, under the Document tab, I randomly select a document and >> display it. At the bottom will be 4 columns, Field, ITSVopLBC, Norm and >> String Value. >> >> I am wondering, what is Norm for? And where is it created during indexing >> time? Which method calculates it? >> >> Could anyone advise me on this? Thanks for the help >> -- >> View this message in context: >> http://www.nabble.com/Index-of-Lucene-tp19025490p19025490.html >> Sent from the Lucene - Java Users mailing list archive at Nabble.com. >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> > > -- View this message in context: http://www.nabble.com/Index-of-Lucene-tp19025490p19025890.html Sent from the Lucene - Java Users mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
