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  • archive/eval-fusion-zbranch f4bfc12293

    ARM ONLY, NEVER MERGE: z-scored branch fusion

    Ghost released this 2026-08-31 18:10:22 +02:00 | 42 commits to main since this release

    Hybrid without a reranker keeps each database's vector and FTS branches
    apart and compares every candidate by per-branch z-score, summing both
    branches for a chunk found in each. Databases are then compared by how
    exceptional a hit is for them rather than by raw score, which is not
    comparable across indexes.

    Targets the measured ceiling on rank-and-score fusion: 73% of candidates at
    n=4 and 84% at n=8 tie on both score and rank, so no key built from those
    two can separate them and they fall to declaration order under every other
    arm. Continuous keys should barely collide.

    Implementation from the multi-fusion session; branch depth via
    HAIKU_RAG_BRANCH_DEPTH, default 20.

    Claude-Session: https://claude.ai/code/session_01WhudUtZm6qqiuv8Y1sbwSc

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