Update README.md

README.md

@@ -44,6 +44,19 @@ It targets the stage *after base pretraining*, where a model is adapted to opera
 
 If you use this dataset for post-training, context window extension, or evaluation, **please cite this dataset** (see Citation).
 
+## Sequence Length Distribution and Data Sources
+
+| Context Type | Token Length Range | Packed Context Length | Samples | Data Source |
+|-------------|-------------------|----------------------|---------|-------------|
+| Short | 64 – 2,048 | 8K | 8,000 | FineWeb-Edu (sample/10BT) |
+| Short | 2,048 – 4,096 | 8K | 8,000 | FineWeb-Edu (sample/10BT) |
+| Short | 4,096 – 9,216 | 8K | 16,000 | FineWeb-Edu (sample/10BT) |
+| Long | 8K – 32K | 128K | 8,000 | RedPajama-Data-1T (arXiv, Wikipedia, Common Crawl) |
+| Long | 32K – 64K | 128K | 8,000 | RedPajama-Data-1T (arXiv, Wikipedia, Common Crawl) |
+| Long | 64K – 128K | 128K | 16,000 | RedPajama-Data-1T (arXiv, Common Crawl) |
+| Long | 128K – 200K | 128K | 8,000 | RedPajama-Data-1T (arXiv, Common Crawl) |
+| **Total** | — | — | **72,000** | — |
+
 ---
 
 ## Dataset Format