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  • archive/eval-fusion-tiebreak 16a1d9598b

    Break cross-database RRF rank ties by retrieval score

    Ghost released this 2026-08-31 18:10:13 +02:00 | 42 commits to main since this release

    Disjoint corpora give every database's rank-r candidate the same RRF
    score, and the stable sort resolved those ties to lancedb.databases
    declaration order, discarding the retrieval scores entirely. Ties now
    break on the raw retrieval score, which is uncalibrated across indexes
    but only ever orders candidates within one rank tier: the databases in
    a fusion share an embedder and ran the same search type, and it can
    never lift a candidate above another rank. Hybrid per-database scores
    are themselves rank-derived, so exact agreement still ties and keeps
    configured order, deterministically. The n > limit depth quota is
    unchanged, pending the retrieval eval.

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