add README describing domain-code tokenized corpus

README.md

@@ -0,0 +1,44 @@
+---
+license: apache-2.0
+task_categories:
+  - text-generation
+language:
+  - en
+  - code
+pretty_name: DragonCode Tokenized Pretrain (Domain-Code)
+size_categories:
+  - 10B<n<100B
+---
+
+# DragonCode Tokenized Pretrain — Domain-Code Corpus
+
+Pre-tokenized training corpus for the DragonCode LLM family. This is the
+**domain-code-only** dataset (not general web text).
+
+## Format
+
+- 26 shards: `data/train-00000-of-00026.bin` .. `train-00025-of-00026.bin`
+- Flat `int32` little-endian token-id stream (no headers, no row structure).
+  Concatenate shards in order to reconstruct the full sequence.
+- **3,417,141,141 tokens** total (~3.42B), ~13.67 GB on disk.
+- Sequence length: 4096 (`MAX_SEQ_LEN`) during training.
+
+## Sources (streaming, permissive only)
+
+| Source | Field | License filter |
+|---|---|---|
+| `codeparrot/codeparrot-clean` | `content` | permissive only (MIT/ISC/Apache-2.0/BSD/CC0/Unlicense/etc.) |
+| `open-r1/codeforces-cots` | `prompt` / `generation` | permissive only |
+
+Non-permissive-licensed and empty samples are dropped. General web corpora
+(FineWeb-Edu / SlimPajama / The-Pile) are intentionally excluded per project spec.
+
+## Tokenizer
+
+Uses the DragonCode tokenizer (see `DragonLimited/DragonCode-150M`). Encode with
+`add_special_tokens=False`.
+
+## Note
+
+The previous 5-shard legacy corpus (FineWeb-Edu-based) was fully replaced by this
+domain-code corpus on 2026-08-25.