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121 lines
6.5 KiB
Markdown
121 lines
6.5 KiB
Markdown
# Hybrid Retrieval Failure — Guardrails and Fix Pattern
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<details>
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<summary><strong>🧭 Quick Return to Map</strong></summary>
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<br>
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> You are in a sub-page of **RAG**.
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> To reorient, go back here:
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>
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> - [**RAG** — retrieval-augmented generation and knowledge grounding](./README.md)
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> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
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> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
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>
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> Think of this page as a desk within a ward.
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> If you need the full triage and all prescriptions, return to the Emergency Room lobby.
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</details>
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When hybrid retrieval (BM25 + dense, HyDE + reranker, multi-vector) performs **worse than a single retriever**.
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Instead of increasing recall, the hybrid path introduces instability, wrong ranking, or noisy snippets.
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---
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## Open these first
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- Visual map and recovery: [RAG Architecture & Recovery](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md)
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- End to end retrieval knobs: [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)
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- Traceability schema: [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
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- Snippet contracts: [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
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- Query path splits: [Pattern: Query Parsing Split](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_query_parsing_split.md)
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- Ranking drift: [Rerankers](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md)
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---
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## Core acceptance
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- Hybrid recall ≥ single retriever recall
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- ΔS(question, retrieved) ≤ 0.45 for top-1 result
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- λ stable across three paraphrases and two seeds
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- Coverage ≥ 0.70 to the target section
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---
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## Typical symptoms → exact fix
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| Symptom | Likely cause | Open this |
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|---------|--------------|-----------|
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| Hybrid returns unrelated snippet | query parsing split not locked | [Pattern: Query Parsing Split](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_query_parsing_split.md) |
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| Hybrid recall < single recall | wrong weighting or missing normalization | [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md) |
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| Dense retriever dominates BM25 | metric mismatch | [Embedding ≠ Semantic](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md) |
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| Reranker undoes good hits | λ flips, entropy collapse | [Rerankers](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md), [Entropy Collapse](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/RAG/entropy_collapse.md) |
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---
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## Fix in 60 seconds
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1. **Measure baseline**
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Run BM25 alone and dense alone. Log coverage and ΔS. If hybrid < baseline, do not ship.
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2. **Stabilize query parsing**
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Split HyDE prompts, keyword queries, and dense embeddings into deterministic branches. Lock weighting ratios.
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3. **Reranker probe**
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Compare recall before and after reranker. If entropy rises, clamp with variance control or drop reranker.
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4. **Enforce snippet schema**
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Always require `snippet_id`, `section_id`, `offsets`, `tokens`. Hybrid paths must normalize schema fields.
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---
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## Copy-paste probe prompt
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```txt
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I uploaded TXT OS and the WFGY Problem Map.
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My issue:
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- hybrid retrieval returns worse results than BM25 or dense alone.
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Tell me:
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1) which layer fails (query parsing, weighting, reranker),
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2) which WFGY fix page to open,
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3) minimal steps to restore ΔS ≤ 0.45 and coverage ≥ 0.70,
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4) reproducible test with BM25 vs dense vs hybrid.
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````
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---
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### 🔗 Quick-Start Downloads (60 sec)
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| Tool | Link | 3-Step Setup |
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| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
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| **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>” |
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| **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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---
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<!-- WFGY_FOOTER_START -->
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### Explore More
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| Layer | Page | What it’s for |
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| --- | --- | --- |
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| Proof | [WFGY Recognition Map](/recognition/README.md) | External citations, integrations, and ecosystem proof |
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| Engine | [WFGY 1.0](/legacy/README.md) | Original PDF based tension engine |
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| Engine | [WFGY 2.0](/core/README.md) | Production tension kernel and math engine for RAG and agents |
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| Engine | [WFGY 3.0](/TensionUniverse/EventHorizon/README.md) | TXT based Singularity tension engine, 131 S class set |
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| Map | [Problem Map 1.0](/ProblemMap/README.md) | Flagship 16 problem RAG failure checklist and fix map |
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| Map | [Problem Map 2.0](/ProblemMap/rag-architecture-and-recovery.md) | RAG focused recovery pipeline |
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| Map | [Problem Map 3.0](/ProblemMap/wfgy-rag-16-problem-map-global-debug-card.md) | Global Debug Card, image as a debug protocol layer |
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| Map | [Semantic Clinic](/ProblemMap/SemanticClinicIndex.md) | Symptom to family to exact fix |
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| Map | [Grandma’s Clinic](/ProblemMap/GrandmaClinic/README.md) | Plain language stories mapped to Problem Map 1.0 |
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| Onboarding | [Starter Village](/StarterVillage/README.md) | Guided tour for newcomers |
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| App | [TXT OS](/OS/README.md) | TXT semantic OS, fast boot |
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| App | [Blah Blah Blah](/OS/BlahBlahBlah/README.md) | Abstract and paradox Q and A built on TXT OS |
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| App | [Blur Blur Blur](/OS/BlurBlurBlur/README.md) | Text to image with semantic control |
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| App | [Blow Blow Blow](/OS/BlowBlowBlow/README.md) | Reasoning game engine and memory demo |
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If this repository helped, starring it improves discovery so more builders can find the docs and tools.
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[](https://github.com/onestardao/WFGY)
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<!-- WFGY_FOOTER_END -->
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