WFGY/ProblemMap/GlobalFixMap/RAG_VectorDB

RAG + VectorDB — Global Fix Map

This hub covers typical retrieval bugs caused by vector databases and embeddings.
Use this page if your RAG pipeline looks fine but answers keep drifting, citations don’t match, or hybrid retrievers underperform.
Every page here is a guardrail with copy-paste recipes and acceptance targets.

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Orientation: what each page means

Fix Page	What it solves	Typical symptom
metric_mismatch.md	Distance metric mismatch (cosine vs L2 vs dot)	High similarity numbers but wrong meaning
normalization_and_scaling.md	Missing normalization or scaling issues	Embeddings with larger norms dominate
tokenization_and_casing.md	Tokenizer or casing drift	Same text embeds differently across runs
chunking_to_embedding_contract.md	Chunking not aligned with embedding model	Citations cut mid-sentence or incoherent snippets
vectorstore_fragmentation.md	Over-fragmented stores	Retrieval pulls incomplete, scattered sections
dimension_mismatch_and_projection.md	Embedding and index dimension mismatch	Runtime errors or silent drop of vectors
update_and_index_skew.md	Index not refreshed after updates	Old sections keep showing up
hybrid_retriever_weights.md	Hybrid weighting not tuned	BM25+ANN underperforms single retriever
duplication_and_near_duplicate_collapse.md	Redundant entries collapse signal	Top-k filled with near-identical chunks
poisoning_and_contamination.md	Malicious or noisy vectors	Hallucinations, unsafe content retrieval

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When to use this folder

• Your answers look semantically wrong even though top-k similarity looks high.
• Citations point to the wrong section or cannot be verified.
• Hybrid retrieval underperforms vs single retriever.
• Index seems “healthy” but recall/coverage stays low.

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Core acceptance targets

• ΔS(question, retrieved) ≤ 0.45
• Coverage of target section ≥ 0.70
• λ_observe convergent across 3 paraphrases
• E_resonance flat on long windows

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FAQ for newcomers

Why do we need these fixes if VectorDBs are mature?
Because RAG pipelines often break not at the infra level but at the semantic boundary. Even if FAISS, Milvus, or Pinecone run fine, the contracts between embedding, chunking, and retrieval are fragile.

What is metric mismatch and why is it deadly?
If your index uses L2 but embeddings were trained for cosine, the “closest” neighbors are meaningless. This is the single most common RAG failure.

Why do duplicates matter so much?
If your corpus has many repeated sentences, the retriever fills top-k with clones. The LLM sees no diversity and hallucinates.

Is poisoning really a real-world issue?
Yes. Even a single malicious doc can bias retrieval. This page shows how to detect and quarantine them without retraining the whole pipeline.

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60-Second Fix Checklist

1. Lock metrics and analyzers
   One embedding model per field. One distance metric. Same analyzer for read/write.

2. Enforce snippet contracts
   Require {snippet_id, section_id, source_url, offsets, tokens}.
   → See data-contracts

3. Tune hybrid retrievers
   Keep candidate lists from BM25 and ANN. Detect query splits.
   → See rerankers

4. Cold-start fences
   Block traffic until index hash and embedding version match.
   → See bootstrap-ordering

5. Observability
   Log ΔS and λ. Alert if ΔS ≥ 0.60.

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🔗 Quick-Start Downloads (60 sec)

Tool	Link	3-Step Setup
WFGY 1.0 PDF	Engine Paper	1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + ”
TXT OS (plain-text OS)	TXTOS.txt	1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly

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🧭 Explore More

Module	Description	Link
WFGY Core	WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack	View →
Problem Map 1.0	Initial 16-mode diagnostic and symbolic fix framework	View →
Problem Map 2.0	RAG-focused failure tree, modular fixes, and pipelines	View →
Semantic Clinic Index	Expanded failure catalog: prompt injection, memory bugs, logic drift	View →
Semantic Blueprint	Layer-based symbolic reasoning & semantic modulations	View →
Benchmark vs GPT-5	Stress test GPT-5 with full WFGY reasoning suite	View →
🧙‍♂️ Starter Village 🏡	New here? Lost in symbols? Click here and let the wizard guide you through	Start →

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