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https://issues.apache.org/jira/browse/SOLR-17815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alessandro Benedetti updated SOLR-17815:
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Parent: (was: SOLR-17811)
Issue Type: New Feature (was: Sub-task)
> Add parameter to regulate for ACORN-based filtering in vector search?
> ---------------------------------------------------------------------
>
> Key: SOLR-17815
> URL: https://issues.apache.org/jira/browse/SOLR-17815
> Project: Solr
> Issue Type: New Feature
> Components: vector-search
> Reporter: Alessandro Benedetti
> Priority: Major
>
> ACORN with a threshold of '60' is the default when we upgrade to Lucene 10.x .
> Disabling ACORN can be obtained at KnnSearchStrategy level.
> public static class Hnsw extends KnnSearchStrategy {
> public static final Hnsw DEFAULT = new
> Hnsw(DEFAULT_FILTERED_SEARCH_THRESHOLD);
> This issue should study when ACORN is useful or not, and if the default is
> not good enough for Solr, we should make it parametric and explain it how to
> use it to the users.
> More info will follow and be better organised soon):
> An interesting paper in this area: https://arxiv.org/abs/2403.04871
> ACORN: Performant and Predicate-Agnostic Search Over Vector Embeddings and
> Structured Data
> Liana Patel, Peter Kraft, Carlos Guestrin, Matei Zaharia
> This was implemented in Lucene in https://github.com/apache/lucene/pull/14160
> Specifically in org.apache.lucene.util.hnsw.FilteredHnswGraphSearcher
> that can be used in Solr via
> org.apache.lucene.search.knn.KnnSearchStrategy.Hnsw
> /**
> * Create a new Hnsw strategy
> *
> * @param filteredSearchThreshold threshold for filtered search, a
> percentage value from 0 to
> * 100 where 0 means never use filtered search and 100 means always
> use filtered search.
> */
> public Hnsw(int filteredSearchThreshold) {
> if (filteredSearchThreshold < 0 || filteredSearchThreshold > 100) {
> throw new IllegalArgumentException("filteredSearchThreshold must be
> >= 0 and <= 100");
> }
> this.filteredSearchThreshold = filteredSearchThreshold;
> }
> We may pass an additional parameter to disable it
> (filteredSearchThreshold=0), the default is:
> public static final int DEFAULT_FILTERED_SEARCH_THRESHOLD = 60;
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