On (1) I'm mistaken, its still only reranking whatever the reRankDocs param
is
On Thu, Feb 15, 2024 at 9:38 PM Doug Turnbull <douglas.turnb...@reddit.com>
wrote:
> Just curious if anyone has had success combining multiple rerankers in
> Solr. At least one of which uses the LTR query.
>
> 1. I can issue an LTR query and score the entire corpus with an LTR model
> q={!ltr ...}
> 2. I can naturally use LTR in rq itself rq={!ltr...} and do one rerank
> pass, entirely in LTR
> 3. Multiple rq parameters do not seem supported (one is chosen at random)
> 4. Using an {!rerank, wrapping ltr and another query in a larger function
> query does not work - wrapping LTR in "query()" always returns 1.
>
> Note on 4 - the explain actually will show a different score than if you
> add "score" to fl. Which will lead you to think this works. When in fact,
> adding / removing the LTR from such a function query shows its having no
> effect (and the explain scores don't match what's returned in fl=score).
> This is in Solr 9.3.1.
>
> Has anyone had much luck being able to rerank with multiple stages or
> combine multiple rerankers in Solr?
>
> Thanks!
> -Doug
>
