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From Marc Sturlese <marc.sturl...@gmail.com>
Subject Re: solr booosting
Date Tue, 10 Feb 2009 09:15:16 GMT

Thanks Hoss, that was really useful information.

hossman wrote:
> 
> 
> : As I understood lucene's boost, if you search for "John Le Carre" it
> will
> : give better score to the results that contains just the searched string
> that
> : results that have, for example, 50 words and the search is contained in
> the
> : words.
> : 
> : In Solr, my goal is to give more score to the docs that contains both
> words
> : but that have more words in the field.
> : 
> : I have tried 2 options:
> : 1.-On index time, I check the length of the fields and if are bigger
> that
> : 'x' chars i give more boost to that doc (I am adding 3.0 extra boost
> using
> : addBoost). 
> 
> rather then explicitly setting an index time boost, i would use a custom 
> similarity class to do this -- the lengthNorm function is what you want to 
> change.
> 
> : 2.-In another hand I have been playing with tie and pf but I think they
> are
> : not helping in my issue.
> 
> neither of those options will offset the penalty assigned to longer docs 
> vs shorter docs if both match -- they will help you change the scores 
> for docs that match on multiple fields however.
> 
> : Before using Solr (my own Lucene searcher and indexer) the first option
> use
> : to work quite well, in Solr my extra boost seems to afect much less. Is
> this
> : normal as I am using DismaxQueryParser or it should be the same?
> 
> try using the standard request handler to build the same query structures 
> you are use to and make sure you're getting the expected results that way, 
> then consider how dismax might change things.  one thing to watch out for 
> is that you really aren't doing things the same way ... it's really easy 
> to omitNorms="true" in Solr, in which case your index time boost isn't 
> factoring in at all.
> 
> 
> 
> 
> -Hoss
> 
> 
> 

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