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Posted to dev@lucene.apache.org by "Alessandro Benedetti (JIRA)" <ji...@apache.org> on 2018/06/04 17:24:00 UTC
[jira] [Commented] (LUCENE-8347) BlendedInfixSuggester to handle
multi term matches better
[ https://issues.apache.org/jira/browse/LUCENE-8347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16500554#comment-16500554 ]
Alessandro Benedetti commented on LUCENE-8347:
----------------------------------------------
It is recommended to merge this one first
> BlendedInfixSuggester to handle multi term matches better
> ---------------------------------------------------------
>
> Key: LUCENE-8347
> URL: https://issues.apache.org/jira/browse/LUCENE-8347
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 7.3.1
> Reporter: Alessandro Benedetti
> Priority: Major
> Attachments: LUCENE-8347.patch
>
>
> Currently the blendedInfix suggester considers just the first match position when scoring a suggestion.
> From the lucene-dev mailing list :
> "
> If I write more than one term in the query, let's say
>
> "Mini Bar Fridge"
>
> I would expect in the results something like (note that allTermsRequired=true and the schema weight field always returns 1000)
>
> - *Mini Bar Fridge* something
> - *Mini Bar Fridge* something else
> - *Mini Bar* something *Fridge*
> - *Mini Bar* something else *Fridge*
> - *Mini* something *Bar Fridge*
> ...
>
> Instead I see this:
>
> - *Mini Bar* something *Fridge*
> - *Mini Bar* something else *Fridge*
> - *Mini Bar Fridge* something
> - *Mini Bar Fridge* something else
> - *Mini* something *Bar Fridge*
> ...
>
> After having a look at the suggester code (BlendedInfixSuggester.createCoefficient), I see that the component takes in account only one position, which is the lowest position (among the three matching terms) within the term vector ("mini" in the example above) so all the suggestions above have the same weight
> "
> Scope of this Jira issue is to improve the BlendedInfix to better manage those scenarios.
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