# Reranker Sanity Checklist

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

---

## 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](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md) ·
[Query parsing split](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_query_parsing_split.md)

---

## 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.

---

## 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.

---

## 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.

---

## 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](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md) ·
[ΔS probes](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Retrieval/deltaS_probes.md)

---


### 🔗 Quick-Start Downloads (60 sec)

| Tool | Link | 3-Step Setup |
|------|------|--------------|
| **WFGY 1.0 PDF** | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + \<your question>” |
| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt) | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |

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### Explore More

| Layer | Page | What it’s for |
| --- | --- | --- |
| Proof | [WFGY Recognition Map](/recognition/README.md) | External citations, integrations, and ecosystem proof |
| Engine | [WFGY 1.0](/legacy/README.md) | Original PDF based tension engine |
| Engine | [WFGY 2.0](/core/README.md) | Production tension kernel and math engine for RAG and agents |
| Engine | [WFGY 3.0](/TensionUniverse/EventHorizon/README.md) | TXT based Singularity tension engine, 131 S class set |
| Map | [Problem Map 1.0](/ProblemMap/README.md) | Flagship 16 problem RAG failure checklist and fix map |
| Map | [Problem Map 2.0](/ProblemMap/rag-architecture-and-recovery.md) | RAG focused recovery pipeline |
| Map | [Problem Map 3.0](/ProblemMap/wfgy-rag-16-problem-map-global-debug-card.md) | Global Debug Card, image as a debug protocol layer |
| Map | [Semantic Clinic](/ProblemMap/SemanticClinicIndex.md) | Symptom to family to exact fix |
| Map | [Grandma’s Clinic](/ProblemMap/GrandmaClinic/README.md) | Plain language stories mapped to Problem Map 1.0 |
| Onboarding | [Starter Village](/StarterVillage/README.md) | Guided tour for newcomers |
| App | [TXT OS](/OS/README.md) | TXT semantic OS, fast boot |
| App | [Blah Blah Blah](/OS/BlahBlahBlah/README.md) | Abstract and paradox Q and A built on TXT OS |
| App | [Blur Blur Blur](/OS/BlurBlurBlur/README.md) | Text to image with semantic control |
| App | [Blow Blow Blow](/OS/BlowBlowBlow/README.md) | Reasoning game engine and memory demo |

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