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https://issues.apache.org/jira/browse/LUCENE-10109?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julie Tibshirani resolved LUCENE-10109.
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Resolution: Fixed
> 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
> Priority: Minor
> Time Spent: 40m
> Remaining Estimate: 0h
>
> {{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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