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README.md

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+---
+license: apache-2.0
+task_categories:
+- visual-question-answering
+- question-answering
+language:
+- en
+tags:
+- multi-hop
+- evidence-localization
+- chain-of-evidence
+- 2wikimultihopqa
+- qwen-vl
+size_categories:
+- 10K<n<100K
+---
+
+# CoE (Chain of Evidence) — 2WikiMultiHopQA with Wikipedia Screenshots
+
+Training dataset for the CoE paper: single-hop evidence localization on Wikipedia screenshots, expanded from 2WikiMultiHopQA.
+
+## Contents
+
+`wiki_coe_dataset.tar.zst` (165 MB compressed, ~1 GB uncompressed):
+
+```
+wiki_coe/
+├── train_split_single_hop.json   # 89,819 training samples (95% split)
+├── val_split_single_hop.json     # 4,744 validation samples (5% split)
+├── train_single_hop.json         # 94,563 single-hop samples (full)
+├── test_single_hop.json          # 92,456 test samples
+├── train_clean.json              # 39,823 multi-hop (filtered)
+├── test_clean.json               # 38,588 multi-hop (filtered)
+├── train.json / test.json        # raw multi-hop 2Wiki
+└── screenshots/                  # ~76,000 Wikipedia PNGs
+```
+
+## Split
+
+- Train: **89,819** single-hop samples
+- Val: **4,744** single-hop samples
+- Split at multi-hop parent level (no hop-level leakage)
+
+## Schema (single-hop JSON record)
+
+```json
+{
+  "question": "...",
+  "answer": "...",
+  "evidence_chain": [
+    {"title": "...", "image": "Title_hash.png",
+     "bbox": [x1, y1, x2, y2], "paragraph": "..."}
+  ],
+  "images": ["Title_hash.png"]
+}
+```
+
+## Decompress
+
+```bash
+tar -I 'zstd -d' -xf wiki_coe_dataset.tar.zst
+```