---
pretty_name: MSM v2 shared C4 36k
license: other
task_categories:
- text-generation
---

# MSM v2 shared C4 36k

Training-ready inputs for the second MSM run. Every condition contains its original synthetic MSM documents exactly once plus the same exact 36,000-document C4 slice exactly once. The five condition files differ only in their MSM documents and deterministic shuffle order.

Synthetic rows begin with `<DOCTAG>\n` and declare the same string in `mask_prefix`; C4 rows are untagged and declare an empty `mask_prefix`. The trainer must mask only the declared prefix tokens from the language-modeling loss. All document content and EOS tokens remain supervised.

See `training_manifest.json` for immutable upstream revisions, tokenizer-based token counts, shuffle seeds, file hashes, and realized C4 token fractions. The standalone shared corpus is `shared/c4_en_36k.jsonl.gz`; directly trainable files are under `training/`.