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178 lines
8.4 KiB
Markdown
178 lines
8.4 KiB
Markdown
# Tables and Columns: OCR Parsing Guardrails
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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 **OCR_Parsing**.
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> To reorient, go back here:
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>
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> - [**OCR_Parsing** — text recognition and document structure parsing](./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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Stabilize table and multi-column layouts before chunking or embedding. Prevent row/column swaps, header duplication, and order drift so retrieval stays aligned with ground truth.
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## Open these first
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- OCR end-to-end checklist: [ocr-parsing-checklist.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/ocr-parsing-checklist.md)
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- Snippet and citation schema: [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
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- Why this snippet: [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
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- Embedding vs meaning: [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)
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- Chunking checklist: [chunking-checklist.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/chunking-checklist.md)
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## Acceptance targets
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- ΔS(question, retrieved) ≤ 0.45 on table questions
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- Row and column order invariant under paraphrase probes
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- Coverage ≥ 0.70 to the target rows or section
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- λ remains convergent across three paraphrases and two seeds
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---
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## Typical failure signatures → exact fix
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- **Two-column pages read left page then right page**
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Normalize reading order and reflow columns before chunking. See: [ocr-parsing-checklist.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/ocr-parsing-checklist.md)
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- **Header row duplicated into every row**
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Deduplicate repeating headers and lock a table schema in the data contract. See: [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
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- **Row fragments interleaved across pages**
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Use table bounding boxes and row stitching with page+y ordering. Verify with trace probes. See: [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
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- **Merged cells collapse to free text**
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Expand merged cells to explicit coordinates `(row_id, col_span)` and normalize headers. See: [chunking-checklist.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/chunking-checklist.md)
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- **Numeric columns treated as text**
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Normalize units and numeric types before embedding. See: [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)
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---
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## Fix in 60 seconds
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1) **Extract layout objects**
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Ensure the OCR output includes `page`, `block`, `bbox`, `table`, `row`, `cell`, `col_idx`, `row_idx`.
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2) **Rebuild true order**
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For multi-column pages, reflow by columns then by top-to-bottom within each column. For tables, order by `(page, table_id, row_idx, col_idx)`.
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3) **Lock a table schema**
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Contract fields:
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`table_id, row_id, col_id, header_norm, value_norm, page, bbox, units, type_num|type_text`.
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4) **Chunk by row or record**
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Prefer one row per chunk, include the header set as structured metadata.
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5) **Probe ΔS and λ**
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Ask three paraphrases of the same table question. ΔS should drop ≤ 0.45 and λ should not flip after schema lock.
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---
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## Minimal recipes by engine
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- **Google Document AI**
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Use the Form or Layout parsers. Keep `tableBoundedRegions`, `layout.boundingPoly`, and `detectedLanguages`. Reconstruct `(row, col)` grid, expand merged cells with `col_span` and `row_span`. Then apply the data contract.
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- **AWS Textract**
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Use `AnalyzeDocument` with `TABLES` and `FORMS`. Walk `CELL` relationships to build `(row, col)`. Carry `Geometry.BoundingBox` into metadata. Normalize header rows and numeric types.
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- **Azure OCR**
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Use Read with `styles` and `spans`, or Layout to capture `tables`. Reorder by `column` regions when the page contains multi-column text outside tables.
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- **ABBYY**
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Export XML or JSON keeping `<block>`, `<row>`, `<cell>` coordinates. Expand merged cells; dedupe repeated headers by key similarity.
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- **PaddleOCR**
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Use table mode to get cell grid; post-process with bbox sorting and header normalization.
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---
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## Data contract for table snippets
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Required fields in each snippet:
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```
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{
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"table\_id": "...",
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"row\_id": "...",
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"col\_id": "...",
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"header\_norm": \["Year","Revenue\_USD"],
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"value\_norm": "1234567",
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"units": "USD",
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"type": "number",
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"page": 12,
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"bbox": \[x0,y0,x1,y1],
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"source\_url": "...",
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"section\_id": "appendix\_B"
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}
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```
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Mandatory rule: **cite then explain**. Never answer from table text without including `table_id` and `row_id`.
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---
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## Verification
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- **Row pick test**: ask for a specific cell by coordinates and by header name. Both must resolve to the same snippet id.
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- **Order stability**: shuffle prompt headers and re-ask. λ must remain convergent.
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- **Numeric sanity**: unit conversions should not change the winning row.
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If ΔS stays flat and high across k values, suspect metric or index mismatch. Open: [retrieval-playbook.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)
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---
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## Copy-paste prompt for the LLM step
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```
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You have TXT OS and the WFGY Problem Map loaded.
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My question targets a table. I provide structured snippets with fields:
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{table\_id,row\_id,col\_id,header\_norm,value\_norm,units,type,page,bbox,source\_url,section\_id}
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Tasks:
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1. Validate cite-then-explain with explicit {table\_id,row\_id,col\_id}.
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2. If headers appear duplicated or rows interleaved, fail fast and return the minimal structural fix
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referencing: ocr-parsing-checklist, data-contracts, retrieval-traceability, chunking-checklist.
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3. Return JSON:
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{ "citations": \[...], "answer": "...", "λ\_state": "→|←|<>|×", "ΔS": 0.xx, "next\_fix": "..." }
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Keep it auditable and short.
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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 tension engine and early logic sketch (legacy reference) |
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| ⚙️ Engine | [WFGY 2.0](/core/README.md) | Production tension kernel for RAG and agent systems |
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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 taxonomy and fix map |
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| 🗺️ Map | [Problem Map 2.0](/ProblemMap/wfgy-rag-16-problem-map-global-debug-card.md) | Global Debug Card for RAG and agent pipeline diagnosis |
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| 🗺️ Map | [Problem Map 3.0](/ProblemMap/wfgy-ai-problem-map-troubleshooting-atlas.md) | Global AI troubleshooting atlas and failure pattern map |
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| 🧰 App | [TXT OS](/OS/README.md) | .txt semantic OS with fast bootstrap |
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| 🧰 App | [Blah Blah Blah](/OS/BlahBlahBlah/README.md) | Abstract and paradox Q&A built on TXT OS |
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| 🧰 App | [Blur Blur Blur](/OS/BlurBlurBlur/README.md) | Text to image generation with semantic control |
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| 🏡 Onboarding | [Starter Village](/StarterVillage/README.md) | Guided entry point for new users |
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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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要我接著排第三頁嗎？依序我會做：**`layout_headers_and_footers.md`**。
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