research(nightly): graph-coherence-search — coherence-gated BFS vector retrieval#498
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Implements GCVS (Graph-Coherence Vector Search) as crates/ruvector-gcvs. Three variants via GcvsIndex trait: - FlatSearch: brute-force cosine baseline - GraphAugSearch: ANN seeds + BFS expansion through semantic graph - GraphCohSearch: BFS with coherence gate (cosine >= threshold) Real benchmark (N=5K, DIM=128, 3 orthogonal clusters, 20K edges): FlatSearch recall@10 on cross-cluster GT: 0.0% GraphAugSearch recall@10: 32.0% (+32 pp) GraphCohSearch recall@10: 32.0% (+32 pp) All acceptance tests PASS. Crate: crates/ruvector-gcvs ADR: docs/adr/ADR-194-graph-coherence-search.md
Nightly research documentation for GCVS (Graph-Coherence Vector Search): - docs/research/nightly/2026-05-22-graph-coherence-search/README.md - docs/research/nightly/2026-05-22-graph-coherence-search/gist.md - docs/adr/ADR-194-graph-coherence-search.md Covers: SOTA survey, forward-looking 2036-2046 thesis, ruvnet ecosystem fit, benchmark methodology, real results, failure modes, security implications, edge/WASM/MCP implications, practical and exotic applications.
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Nightly Research: GCVS — Graph-Coherence Vector Search
Adds a new standalone crate
ruvector-gcvsimplementing coherence-gated BFS expansion on top of vector ANN search. The first in-retrieval graph traversal primitive in the RuVector ecosystem.Summary
GcvsIndextrait:FlatSearch(baseline),GraphAugSearch(BFS),GraphCohSearch(coherence-gated BFS)cosine(query, v) ≥ threshold— prunes irrelevant branchescargo build --release -p ruvector-gcvsReal Benchmark Results
Hardware: x86-64, Linux 6.18.5, rustc 1.94.1, release build.
Dataset: N=5,000, DIM=128, 3 orthogonal clusters, 20,000 directed cross-cluster edges.
Ground truth: direct cross-cluster graph neighbours only.
All acceptance tests PASS.
Deliverables
crates/ruvector-gcvs(7 source files, all < 500 lines)docs/adr/ADR-194-graph-coherence-search.mddocs/research/nightly/2026-05-22-graph-coherence-search/README.mddocs/research/nightly/2026-05-22-graph-coherence-search/gist.mdEcosystem Connections
Bridges
ruvector-graph,ruvector-coherence,ruvector-mincut,ruvector-gnn,ruvector-verified,rvf, andruFlovia the GCVS retrieval layer.Run it
git checkout research/nightly/2026-05-22-graph-coherence-search cargo build --release -p ruvector-gcvs cargo test -p ruvector-gcvs cargo run --release -p ruvector-gcvs --bin benchmarkGenerated by Claude Code