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Posted to dev@lucene.apache.org by "Neil Hooey (JIRA)" <ji...@apache.org> on 2011/05/05 17:27:04 UTC
[jira] [Created] (SOLR-2498) Stop consolidating boosts for values
of multivalued fields
Stop consolidating boosts for values of multivalued fields
----------------------------------------------------------
Key: SOLR-2498
URL: https://issues.apache.org/jira/browse/SOLR-2498
Project: Solr
Issue Type: Improvement
Affects Versions: 3.1, 4.0, Next
Reporter: Neil Hooey
Currently, if you boost a value in a multivalued field during index time, the boosts are consolidated for every field, and the individual values are lost.
So, for example, given a list of photos with a multivalue field "keywords", and a boost for a keyword assigned to a photo corresponds to the number of times that photo was downloaded after searching for that particular keyword.
{code}
photo1: Photo of a cat by itself:
keywords: [ cat:600 feline:100 ]
=> boost total = 700
photo2: Photo of a cat driving a truck:
keywords: [ cat:100 feline:90 animal:80 truck:1000 ]
=> boost total = 1270
{code}
If you search for "cat feline", photo2 will rank higher, since the boost of "cat-like" words was consolidated for the "truck" boost anomoly to score a total of 1270. Whereas photo1, which has more "cat feline" downloads, only gets a score of 700, and ranks lower.
*Intuitively the boosts should be separate, so only the boosts for the terms searched will be counted.*
Given the current behaviour, you are forced to do one of the following:
1. Assemble all of the multi-values into a string, and use payloads in place of boosts.
2. Use dynamic fields, such as keyword_*, and boost them independently.
Neither of these solutions are ideal, as using payloads requires writing your own BoostingTermQuery, and defining a new dynamic field per multi-value makes searching more difficult than with mutlivalued fields.
There's a blog link that describes the current behaviour:
http://blog.kapilchhabra.com/2008/01/solr-index-time-boost-facts-2
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[jira] [Closed] (SOLR-2498) Stop consolidating boosts for values of
multivalued fields
Posted by "Neil Hooey (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/SOLR-2498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Neil Hooey closed SOLR-2498.
----------------------------
Resolution: Duplicate
> Stop consolidating boosts for values of multivalued fields
> ----------------------------------------------------------
>
> Key: SOLR-2498
> URL: https://issues.apache.org/jira/browse/SOLR-2498
> Project: Solr
> Issue Type: Improvement
> Reporter: Neil Hooey
>
> I accidentally double-submitted this bug when my browser crashed.
> Here is the real one:
> https://issues.apache.org/jira/browse/SOLR-2499
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[jira] [Updated] (SOLR-2498) Stop consolidating boosts for values
of multivalued fields
Posted by "Neil Hooey (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/SOLR-2498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Neil Hooey updated SOLR-2498:
-----------------------------
Labels: (was: boost multivalue multivalued)
Description:
I accidentally double-submitted this bug when my browser crashed.
Here is the real one:
https://issues.apache.org/jira/browse/SOLR-2499
was:
Currently, if you boost a value in a multivalued field during index time, the boosts are consolidated for every field, and the individual values are lost.
So, for example, given a list of photos with a multivalue field "keywords", and a boost for a keyword assigned to a photo corresponds to the number of times that photo was downloaded after searching for that particular keyword.
{code}
photo1: Photo of a cat by itself:
keywords: [ cat:600 feline:100 ]
=> boost total = 700
photo2: Photo of a cat driving a truck:
keywords: [ cat:100 feline:90 animal:80 truck:1000 ]
=> boost total = 1270
{code}
If you search for "cat feline", photo2 will rank higher, since the boost of "cat-like" words was consolidated for the "truck" boost anomoly to score a total of 1270. Whereas photo1, which has more "cat feline" downloads, only gets a score of 700, and ranks lower.
*Intuitively the boosts should be separate, so only the boosts for the terms searched will be counted.*
Given the current behaviour, you are forced to do one of the following:
1. Assemble all of the multi-values into a string, and use payloads in place of boosts.
2. Use dynamic fields, such as keyword_*, and boost them independently.
Neither of these solutions are ideal, as using payloads requires writing your own BoostingTermQuery, and defining a new dynamic field per multi-value makes searching more difficult than with mutlivalued fields.
There's a blog link that describes the current behaviour:
http://blog.kapilchhabra.com/2008/01/solr-index-time-boost-facts-2
Affects Version/s: (was: Next)
(was: 4.0)
(was: 3.1)
> Stop consolidating boosts for values of multivalued fields
> ----------------------------------------------------------
>
> Key: SOLR-2498
> URL: https://issues.apache.org/jira/browse/SOLR-2498
> Project: Solr
> Issue Type: Improvement
> Reporter: Neil Hooey
>
> I accidentally double-submitted this bug when my browser crashed.
> Here is the real one:
> https://issues.apache.org/jira/browse/SOLR-2499
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