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https://issues.apache.org/jira/browse/SOLR-18245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SOLR-18245:
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Labels: pull-request-available (was: )
> Add reRerankCutoff Output For LTR Based Sorts
> ---------------------------------------------
>
> Key: SOLR-18245
> URL: https://issues.apache.org/jira/browse/SOLR-18245
> Project: Solr
> Issue Type: Improvement
> Components: ltr
> Reporter: Darren Shaw
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> h1. Context
> When using LTR, a client may need to know the sort score that a document
> would have required to have been eligible for rerank by LTR.
> This is best illustrated by the following real-world example.
> h2. Example Use Case
> Solr is used in a retail environment where documents represent products. One
> element that contributes to the sort score and therefore the document
> ordering is a field called {{{}commercialUplift{}}}. This allows the retailer
> to increase the score of a document due to commercial factors that are not
> directly tied to the relevance of the document.
> This {{commercialUplift}} is just one element used in the sort scoring
> function.
> Given a page of results the retailer needs to to know the sort score another
> document would require to have been included in that page and therefore the
> {{commercialUplift}} value that would have been needed to increase a
> document's score enough to get in to that page.
> With a non-LTR search it is possible to do this by retrieving the sort score
> of the lowest ranked document in a page of results.
> But with LTR and its two stage ranking, in cases where the {{reRankDocs}}
> size is greater than the page size ({{{}rows{}}}) and all documents are not
> re-ranked, this is not possible. As well as the rerank scores output in the
> final page of results, the retailer would need to know the original sort
> score required for a document to have been included in the rerank stage (the
> score of the lowest ranked document in the main sort scoring, before
> re-ranking).
> h1. Requirement
> Add a parameter to LTR queries to output a rerank cutoff value in the
> response header. This value would be the original sort value(s) of the lowest
> ranked document that was eligible for reranking.
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