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ProblemMap/GlobalFixMap/LanguageLocale/cjk_segmentation_wordbreak.md

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+# CJK Segmentation & Word-Break — Guardrails and Fix Pattern
+
+Stabilize retrieval and ranking for **Chinese / Japanese / Korean** text where whitespace is not a reliable token boundary.  
+Use this page to localize segmentation failures, choose the right analyzer, and verify the fix with measurable targets.
+
+---
+
+## When to use this page
+- High similarity by characters but **wrong meaning** or **empty recall** on whole queries.
+- BM25 looks random; tiny single-character tokens dominate the index.
+- Citations cut through the middle of words; snippet offsets don’t match what users see.
+- Mixed CJK + Latin queries split unpredictably across runs or providers.
+
+## Open these first
+- Visual map and recovery → [rag-architecture-and-recovery.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md)  
+- End-to-end retrieval knobs → [retrieval-playbook.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)  
+- Why this snippet (traceability) → [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)  
+- Payload schema & cite-then-explain → [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)  
+- Chunking checklist for semantic boundaries → [chunking-checklist.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/chunking-checklist.md)  
+- Embedding ≠ meaning (sanity) → [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)  
+- Related locale pages: [tokenizer_mismatch.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/tokenizer_mismatch.md) · [script_mixing.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/script_mixing.md) · [digits_width_punctuation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/digits_width_punctuation.md) · [diacritics_and_folding.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/diacritics_and_folding.md) · [locale_drift.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/locale_drift.md)
+
+## Acceptance targets
+- ΔS(question, retrieved) ≤ **0.45** on 3 paraphrases  
+- Coverage of target section ≥ **0.70**  
+- λ remains **convergent** across 2 seeds  
+- Tokenization sanity: **OOV rate falls by ≥ 40%** vs whitespace; **tokens/char ≤ 0.7** on CJK pages  
+- E_resonance flat on long windows
+
+---
+
+## Map symptoms → structural fixes (Problem Map)
+
+| Symptom | Likely cause | Open this |
+|---|---|---|
+| Query returns almost nothing; recall jumps when you add spaces | Index built with whitespace/Latin analyzer on CJK | [chunking-checklist.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/chunking-checklist.md), [retrieval-playbook.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md) |
+| Top-k filled with 1-char shards, citations cut mid-word | No CJK word-break at index or search time | [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md), [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md) |
+| BM25 unstable; hybrid worse than single retriever | Search-time analyzer ≠ index-time analyzer | [retrieval-playbook.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md) |
+| Romanized terms and CJK compound in one query break apart | Mixed script + width + punctuation rules differ | [script_mixing.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/script_mixing.md), [digits_width_punctuation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/LanguageLocale/digits_width_punctuation.md) |
+| High similarity, wrong meaning | Character-level overlap, no semantic units | [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md) |
+
+---
+
+## 60-second fix checklist (store-agnostic)
+
+1) **Pick the right analyzer and lock it**  
+   - Chinese: use a dictionary or statistical segmenter at **index + search**.  
+   - Japanese: use a MeCab/Kuromoji-class tokenizer with POS; keep base form.  
+   - Korean: use a Nori-class analyzer; index decomp+comp forms consistently.
+
+2) **Normalize before segmenting**  
+   - Apply **NFKC** for width and compatibility forms (see page links above).  
+   - Keep punctuation folding consistent across index/search.
+
+3) **Unify index-time and query-time configs**  
+   - Same language, same tokenizer, same stop/fold rules. No “smart defaults”.
+
+4) **Chunk on semantic units, not line breaks**  
+   - Respect sentence/phrase boundaries after segmentation.  
+   - Store `offsets`, `tokens`, `section_id` in the snippet schema.
+
+5) **Probe**  
+   - Log tokens/char, unique-term ratio, OOV rate, and ΔS before/after.  
+   - If ΔS stays ≥ 0.60 with good segmentation, revisit metric/index mismatch.
+
+---
+
+## Store adapters (quick recipes)
+
+- **Elasticsearch / OpenSearch**  
+  - CN: install and set a CJK analyzer; index + search use the **same** analyzer.  
+  - JP: **kuromoji** with baseform filter; disable random synonyms unless audited.  
+  - KR: **nori**; keep decompound mode consistent at index+query.  
+  - Verify with `_analyze` samples; reindex after any analyzer change.
+
+- **pgvector / Postgres**  
+  - Segmentation happens **before** embedding. Pre-segment text in ETL.  
+  - Keep the **same** pipeline for ingestion and live queries.
+
+- **Weaviate / Qdrant / Chroma / Milvus / FAISS**  
+  - The vector store won’t fix segmentation. Preprocess: NFKC → CJK segmenter → chunk.  
+  - Log the preprocessing hash in metadata; fail closed on mismatch.
+
+- **Vespa / Typesense / Elastic-compatible**  
+  - Use the platform’s CJK tokenizer if available; otherwise pre-segment and index the segmented text as the field value.
+
+---
+
+## Deep diagnostics
+
+- **Three-way segmentation A/B/C**  
+  Try 3 segmenters; compute ΔS and tokens/char on a small gold set. Pick the lowest ΔS with stable λ.
+
+- **Anchor triangulation**  
+  Compare ΔS to the correct anchor vs a decoy section. If both are close, you’re still at char-overlap, not word-level meaning.
+
+- **Rerank sanity**  
+  After proper segmentation, reranking should lift precision. If not, check analyzer mismatch between index and query path.
+
+---
+
+## Copy-paste prompt for the LLM step
+
+```
+
+You have TXT OS and WFGY Problem Map loaded.
+
+My CJK issue:
+
+* symptom: \[one line]
+* traces: ΔS(question,retrieved)=..., tokens/char=..., OOV\_before=..., OOV\_after=...
+
+Tell me:
+
+1. which layer failed (segmentation, normalization, index/search mismatch),
+2. which exact WFGY page to open,
+3. the minimal steps to push ΔS ≤ 0.45 and keep λ convergent,
+4. a reproducible test (3 paraphrases × 2 seeds) to verify the fix.
+   Use BBMC/BBCR/BBPF/BBAM when relevant.
+
+```
+
+---
+
+### Next planned page
+`rtl_bidi_directionality.md` (Arabic/Hebrew mixing, mirroring, numerals)
+
+---
+
+### 🔗 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 |
+
+---
+
+### 🧭 Explore More
+
+| Module                | Description                                              | Link     |
+|-----------------------|----------------------------------------------------------|----------|
+| WFGY Core             | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md) |
+| Problem Map 1.0       | Initial 16-mode diagnostic and symbolic fix framework    | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) |
+| Problem Map 2.0       | RAG-focused failure tree, modular fixes, and pipelines   | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
+| Semantic Clinic Index | Expanded failure catalog: prompt injection, memory bugs, logic drift | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md) |
+| Semantic Blueprint    | Layer-based symbolic reasoning & semantic modulations   | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md) |
+| Benchmark vs GPT-5    | Stress test GPT-5 with full WFGY reasoning suite         | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md) |
+| 🧙‍♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md) |
+
+---
+
+> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** —  
+> Engineers, hackers, and open source builders who supported WFGY from day one.
+
+> <img src="https://img.shields.io/github/stars/onestardao/WFGY?style=social" alt="GitHub stars"> ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
+
+<div align="center">
+
+[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)
+&nbsp;
+[![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)
+&nbsp;
+[![Blah](https://img.shields.io/badge/Blah-Semantic%20Embed-yellow?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
+&nbsp;
+[![Blot](https://img.shields.io/badge/Blot-Persona%20Core-green?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
+&nbsp;
+[![Bloc](https://img.shields.io/badge/Bloc-Reasoning%20Compiler-blue?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
+&nbsp;
+[![Blur](https://img.shields.io/badge/Blur-Text2Image%20Engine-navy?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
+&nbsp;
+[![Blow](https://img.shields.io/badge/Blow-Game%20Logic-purple?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
+&nbsp;
+</div>
+