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https://issues.apache.org/jira/browse/SOLR-2754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13106795#comment-13106795
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David Mark Nemeskey commented on SOLR-2754:
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bq. Alternative, another idea would be for all 'parametric' models to require
the parameter? ... Part of me likes this solution: if you are using a
parametric model then it requires you to think about it?
I can understand the reasoning behind this idea. On the other hand, for some
models, the parameter has a value that's optimal in a wide range of cases. In
such cases, I think it we could make the life of the user easier by falling
back to this value. (Actually, that's why {{LMJelinekMercerSimilarity}} does
not have a default constructor; there is no single parameter value that is
kind-of-optimal in all cases).
bq. But i started thinking about this, say I created NormalizationRob, and it
wants a bunch of parameters...
Yes, I know, it'd be a bit difficult to support that... maybe if all
Similarities and models had a constructor with a map as a parameter? I'm not
sure we want that, though.
bq. I think the intent here is to support all of lucene-core's capabilities?
In that case let's forget reflection for now.
> create Solr similarity factories for new ranking algorithms
> -----------------------------------------------------------
>
> Key: SOLR-2754
> URL: https://issues.apache.org/jira/browse/SOLR-2754
> Project: Solr
> Issue Type: New Feature
> Affects Versions: 4.0
> Reporter: Robert Muir
> Assignee: Robert Muir
> Attachments: SOLR-2754.patch
>
>
> To make it easy to use some of the new ranking algorithms, we should add
> factories to solr:
> * for parametric models like LM and BM25 so that parameters can be set from
> schema.xml
> * for framework models like DFR and IB, so that different basic
> models/normalizations/lambdas can be chosen
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