Julie Tibshirani created LUCENE-10109:
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Summary: Increase default 'beam width' for HNSW
Key: LUCENE-10109
URL: https://issues.apache.org/jira/browse/LUCENE-10109
Project: Lucene - Core
Issue Type: Improvement
Reporter: Julie Tibshirani
{{Lucene90HnswVectorsFormat}} has a default 'beam width' of 16. This is quite
low and doesn't produce good recall on typical-sized datasets. Lucene's 'beam
width' roughly corresponds to the efConstruction parameter in HNSW. As a
reference, the runs in ann-benchmarks set efConstruction between ~400 and 800,
most common seems to be 500.
I think we should bump the default for beam width to something like 100 or 500
to produce decent results out-of-the-box. I don't think it will slow down tests
too much, but we could always set it lower in tests if necessary.
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