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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "UserTagDesign" by MarkBennett
Date Mon, 17 Jan 2011 22:30:58 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "UserTagDesign" page has been changed by MarkBennett.
The comment on this change is: Adding comments about the relevancy of a tagged field match..
http://wiki.apache.org/solr/UserTagDesign?action=diff&rev1=3&rev2=4

--------------------------------------------------

  The latter looks simpler, but the former allows phrase queries to match different components
of a tag
  with a single query.  A Lucene PhraseQuery across multiple fields would also work for the
latter if this capability is needed.
  
+ ===== Relevancy Calculations for Tags =====
+ To leverage Relevancy calculations, you'd include the tag as part of the regular fulltext
search (q), vs. just adding it as a filter (fq).
+ 
+ If multiple users have tagged a document with "lucene", then that field's density for the
term will be higher, so Relevancy will also tend to be higher.  However, another document
with only 1 tag, which happens to be 'lucene', will likely still rank higher than a heavily
tagged document with only 40% of the tags equal to 'lucene', given Lucene's default relevancy
formulas.
+ 
+ More advanced relevancy models would need more sophisticated implementations, for example
perhaps a custom Similarity class.
+ 
+ 
  ===== U-delUserTag =====
    remove A10.utag="~erik#lucene"
  

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