RE: How to set discountOverlaps=true in Solr 4x schema.xml

2013-08-23 Thread Markus Jelsma 
Yes, discountOverlaps is used in computeNorm which is used at index time. You 
should see a change after reindexing.

Cheers,
Markus
 
-Original message-
 From:Tom Burton-West tburt...@umich.edu
 Sent: Thursday 22nd August 2013 23:32
 To: solr-user@lucene.apache.org
 Subject: Re: How to set discountOverlaps=quot;truequot; in Solr 4x 
 schema.xml
 
 I should have said that I have set it both to true and to false and
 restarted Solr each time and the rankings and info in the debug query
 showed no change.
 
 Does this have to be set at index time?
 
 Tom

How to set discountOverlaps=true in Solr 4x schema.xml

2013-08-22 Thread Tom Burton-West 
If I am using solr.SchemaSimilarityFactory to allow different similarities
for different fields, do I set discountOverlaps=true on the factory or
per field?

What is the syntax?   The below does not seem to work

similarity class=solr.BM25SimilarityFactory discountOverlaps=true  
similarity class=solr.SchemaSimilarityFactory discountOverlaps=true
 /

Tom

RE: How to set discountOverlaps=true in Solr 4x schema.xml

2013-08-22 Thread Markus Jelsma 
Hi Tom,

Don't set it as attributes but as lists as Solr uses everywhere:
similarity class=solr.SchemaSimilarityFactory
  bool name=discountOverlapstrue/bool
/similarity

For BM25 you can also set k1 and b which is very convenient!

Cheers
 
 
-Original message-
 From:Tom Burton-West tburt...@umich.edu
 Sent: Thursday 22nd August 2013 22:42
 To: solr-user@lucene.apache.org
 Subject: How to set discountOverlaps=quot;truequot; in Solr 4x schema.xml
 
 If I am using solr.SchemaSimilarityFactory to allow different similarities
 for different fields, do I set discountOverlaps=true on the factory or
 per field?
 
 What is the syntax?   The below does not seem to work
 
 similarity class=solr.BM25SimilarityFactory discountOverlaps=true  
 similarity class=solr.SchemaSimilarityFactory discountOverlaps=true
  /
 
 Tom

Re: How to set discountOverlaps=true in Solr 4x schema.xml

2013-08-22 Thread Tom Burton-West 
Thanks Markus,

I set it , but it seems to make no difference in the score or statistics
listed in the debugQuery or in the ranking.   I'm using a field with
CommonGrams and a huge list of common words, so there should be a huge
difference in the document length with and without discountOverlaps.

Is the default for Solr 4 true?

 similarity class=solr.BM25SimilarityFactory  
  float name=k11.2/float
  float name=b0.75/float
bool name=discountOverlapsfalse/bool
  /similarity



On Thu, Aug 22, 2013 at 4:58 PM, Markus Jelsma
markus.jel...@openindex.iowrote:

 Hi Tom,

 Don't set it as attributes but as lists as Solr uses everywhere:
 similarity class=solr.SchemaSimilarityFactory
   bool name=discountOverlapstrue/bool
 /similarity

 For BM25 you can also set k1 and b which is very convenient!

 Cheers


 -Original message-
  From:Tom Burton-West tburt...@umich.edu
  Sent: Thursday 22nd August 2013 22:42
  To: solr-user@lucene.apache.org
  Subject: How to set discountOverlaps=quot;truequot; in Solr 4x
 schema.xml
 
  If I am using solr.SchemaSimilarityFactory to allow different
 similarities
  for different fields, do I set discountOverlaps=true on the factory or
  per field?
 
  What is the syntax?   The below does not seem to work
 
  similarity class=solr.BM25SimilarityFactory discountOverlaps=true  
  similarity class=solr.SchemaSimilarityFactory discountOverlaps=true
   /
 
  Tom

Re: How to set discountOverlaps=true in Solr 4x schema.xml

2013-08-22 Thread Tom Burton-West 
I should have said that I have set it both to true and to false and
restarted Solr each time and the rankings and info in the debug query
showed no change.

Does this have to be set at index time?

Tom