Add dataset README

README.md

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+---
+license: mit
+task_categories:
+  - text-retrieval
+language:
+  - en
+tags:
+  - climate-fact-checking
+  - comp90042
+  - hard-negative-mining
+---
+
+# New-Methodology retrieval training data
+
+Artifacts for the COMP90042 climate claim verification retrieval pipeline.
+
+## Files
+
+| File | Description |
+|------|-------------|
+| `reranker_train_pairs.jsonl` | CE finetune pairs (claim, passage, label) mined from train |
+| `reranker_train_pairs.meta.json` | Mining metadata |
+| `train_bge_top150_candidates.json` | Per-claim BGE-large top-150 candidate pools (train) |
+
+## Mining config (from meta)
+
+```json
+{
+  "output": "/hpc2hdd/home/jyang577/joe/New-Methodology/data/reranker_train_pairs.jsonl",
+  "pool_cache": "/hpc2hdd/home/jyang577/joe/New-Methodology/data/train_bge_top150_candidates.json",
+  "dense_model": "BAAI/bge-large-en-v1.5",
+  "candidate_top_n": 150,
+  "hard_neg_min": 4,
+  "hard_neg_max": 8,
+  "bf16_encode": false,
+  "num_pairs": 13946,
+  "claims": 1228,
+  "positives": 4122,
+  "hard_negatives": 9824,
+  "claims_with_fewer_than_min_neg": 0,
+  "claims_with_no_gold": 0
+}
+```
+
+## Regenerate locally
+
+```bash
+python scripts/01_mine_hard_negatives.py
+```