Reranker Sanity Checklist

Scope: validate a hybrid pipeline where BM25 and ANN feed a deterministic reranker.

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Pre checks

• Persist BM25 and ANN candidate lists before reranking.
• Fix a random seed and record model version for the reranker.
• Store per-candidate features needed by the reranker.
• Ensure identical tokenization between HyDE prompt and server.

Refs:
Rerankers · Query parsing split

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Baseline health

• BM25 top k recall on the gold set ≥ 0.60 at k = 50.
• ANN top k recall on the gold set ≥ 0.60 at k = 50.
• Overlap Jaccard(BM25, ANN) logged for k = 50 to detect split.

If overlap < 0.20 and both recalls are good, a query split is likely.
Route using the split detector or run two paths then merge.

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Reranker behavior

• Uplift over the better baseline ≥ 5 percent recall at k = 10.
• Ranking stable across 3 paraphrases. Kendall tau ≥ 0.60.
• Tie breaking rule fixed and documented.
• Deterministic output given the same candidates and seed.

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Acceptance targets

• Coverage ≥ 0.70 on the gold set after reranking at k = 10 or 20.
• ΔS(question, top1) ≤ 0.45 for at least 70 percent of queries.
• λ_observe convergent across 3 paraphrases and 2 seeds.

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Debug sequence

1. Log both candidate lists and measure overlap.
2. If split detected, enable the split route or increase k per branch.
3. Try a simpler deterministic reranker first.
4. Re-measure uplift and stability.

Refs:
Retrieval playbook · ΔS probes

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