TLDR Tech / Data
Understanding Filtered Vector Search: ACORN's Impact
Metadata filters can significantly impair vector search performance by fragmenting the HNSW graph into isolated segments. Qdrant conducted a comparative analysis of filterable HNSW, ACORN expansion, full scans, and planner choices across one million vectors. The study reveals when adding extra index-time edges surpasses query-time repair capabilities and demonstrates the effectiveness of ACORN in specific scenarios.
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