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README.md

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+# LaTeX Formula Bucket Indices (Train/Test Split)
+
+## Overview
+
+This dataset contains bucket indices for the LaTeX formulas dataset, split into train and test sets.
+
+**Source Dataset:** OleehyO/latex-formulas
+**Total Samples:** 552,340
+**Split Ratio:** 80% train / 20% test
+**Random Seed:** 42
+
+## Split Statistics
+
+- **Train Set:** 441,869 samples (80.0%)
+- **Test Set:** 110,471 samples (20.0%)
+
+## Bucket Distribution
+
+### Train Set
+- 2line: 73,316 samples
+- long: 31,543 samples
+- long_2line: 23,364 samples
+- long_matrix: 652 samples
+- long_single_line: 7,527 samples
+- matrix: 6,126 samples
+- medium: 264,458 samples
+- medium_2line: 47,114 samples
+- medium_matrix: 4,437 samples
+- medium_single_line: 212,907 samples
+- short: 145,868 samples
+- short_2line: 2,838 samples
+- short_matrix: 1,037 samples
+- short_single_line: 141,993 samples
+- single_line: 362,427 samples
+
+### Test Set
+- 2line: 18,330 samples
+- long: 7,886 samples
+- long_2line: 5,841 samples
+- long_matrix: 163 samples
+- long_single_line: 1,882 samples
+- matrix: 1,533 samples
+- medium: 66,116 samples
+- medium_2line: 11,779 samples
+- medium_matrix: 1,110 samples
+- medium_single_line: 53,227 samples
+- short: 36,469 samples
+- short_2line: 710 samples
+- short_matrix: 260 samples
+- short_single_line: 35,499 samples
+- single_line: 90,608 samples
+
+## Files
+
+- `indices/indices_*_train.json` - Training set indices per bucket
+- `indices/indices_*_test.json` - Test set indices per bucket
+- `indices/split_mapping.json` - Complete train/test split mapping
+
+## Usage
+
+```python
+import json
+from huggingface_hub import hf_hub_download
+
+# Download specific bucket
+filepath = hf_hub_download(
+    repo_id="wulanbhai/subset",
+    filename="indices/indices_short_train.json",
+    repo_type="dataset"
+)
+
+with open(filepath, 'r') as f:
+    indices = json.load(f)
+
+print(f"Loaded {len(indices):,} training indices for 'short' bucket")
+```
+
+## Bucket Definitions
+
+- **Length buckets:**
+  - short: ≤50 tokens
+  - medium: 51-150 tokens
+  - long: >150 tokens
+
+- **Structure buckets:**
+  - single_line: Single-line formulas
+  - 2line: Multi-line formulas (using `\\`)
+  - matrix: Matrix structures
+
+- **Combined buckets:** Intersection of length × structure (e.g., `short_single_line`)
+
+## Important Notes
+
+⚠️ **For Fair Comparison:**
+- Use **train set** for model training/fine-tuning
+- Use **test set** for evaluation ONLY
+- Never train on test set!
+- Never test on train set!
+
+✅ **Stratified Split:**
+- Each bucket maintains 80%/20% ratio
+- Distribution preserved across all buckets
+
+## Citation
+
+If you use these indices, please cite the original dataset:
+```
+@dataset{latex_formulas,
+  author = {OleehyO},
+  title = {LaTeX Formulas Dataset},
+  year = {2024},
+  url = {https://huggingface.co/datasets/OleehyO/latex-formulas}
+}
+```
+
+## License
+
+Indices only (no original data redistributed).