 | | | AW: Poor Lucene Ranking for Short Text | AW: Poor Lucene Ranking for Short Text 2004-12-24 - By Michael Hartmann
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Hi Kevin,
Seem like you have some knowledge about the lenghtNorm value in Lucene.
Comparing it to the formula in "Modern Information Retrieval" does it sum up
the denominator sqrt((sum(tf_d*idf_t)?)) * sqrt((sum(tf_q*idf_t)?))
Just a quick note is ok.
Besides that could you invite me to rojo. There beta status seem to be quite
long.
Thanks
Michael
| -- --Urspr?ngliche Nachricht-- --
| Von:
| lucene-user-return-10902-michael.hartmann=web.de@(protected)
| e.org
| [mailto:lucene-user-return-10902-michael.hartmann=web.de@(protected)
| ta.apache.org] Im Auftrag von Kevin A. Burton
| Gesendet: Mittwoch, 27. Oktober 2004 22:48
| An: Lucene Users List
| Betreff: Re: Poor Lucene Ranking for Short Text
|
| Daniel Naber wrote:
|
| > (Kevin complains about shorter documents ranked higher)
| >
| >This is something that can easily be fixed. Just use a Similarity
| >implementation that extends DefaultSimilarity and that overwrites
| >lengthNorm: just return 1.0f there. You need to use that
| Similarity for
| >indexing and searching, i.e. it requires reindexing.
| >
| >
| What happens when I do this with an existing index? I don't
| want to have to rewrite this index as it will take FOREVER
|
| If the current behavior is all that happens this is fine...
| this way I can just get this behavior for new documents that
| are added.
|
| Also... why isn't this the default?
|
| Kevin
|
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