Hi all, I'm trying to implement an image similarity search using Solr 4.6.1.
I store an image descriptor in each document, and compare these with the descriptor given in the query, resulting in an image similarity score. This score is then used to filter documents (via a threshold), and to sort the results. I've written the boilerplate QParser and QParserPlugin around a custom Query and its accompanying Weight and Scorer classes. The Scorer.nextDoc() is where the actual image similarity computation (and skipping of docs below the threshold) takes place. This Query/Weight/Scorer construct is obviously very costly, so I don't want it to leapfrog with the other - much faster - filters in the query (especially when using a high threshold). I've tried the "post filtering" mechanism described by Yonik here: http://java.dzone.com/articles/advanced-filter-caching-solr This speeds up things, but now the results are not sorted by image similarity any more. I guess what I actually need is a "post query", as opposed to a "post filter". How can I bring together post filtering and sorting? Do I have to write and use a custom sort function, effectively computing image similarities twice? Any help appreciated! Cheers, Patrick --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
