---
license: cc-by-4.0
language:
- en
tags:
- sentencepiece
- tokenizer
- fineweb
- parameter-golf
- bpe
- tokenized-corpus
size_categories:
- 10B<n<100B
---

# Parameter Golf SP16384 — Tokenizer + Tokenized FineWeb-10B Shards

SentencePiece BPE tokenizer (`vocab_size=16384`, `byte_fallback=True`) + the full FineWeb-10B corpus pre-tokenized with it. Companion artifact to the chaoscontrol submission pipeline; published to make submission-day setup frictionless — no corpus download, no re-tokenization.

## Files

### Tokenizer (root)
- `fineweb_16384_bpe.model` — SentencePiece model (455 KB).
- `fineweb_16384_bpe.vocab` — Human-readable vocab sidecar (185 KB).

### Tokenized shards (`shards/`)
- `shards/fineweb_val_000000.bin` — val shard, 42,266,034 tokens (~84 MB, uint16).
- `shards/fineweb_train_{000000..000132}.bin` — 133 train shards, 13,262,831,920 tokens (~25 GB total, uint16).

Shards are flat `uint16` little-endian token streams, no header, concatenated docs with no separators. Each shard ends on a doc boundary. First 50k docs of `docs_selected.jsonl` → val, rest → train (file order, per the upstream manifest contract).

## Submission-day usage

Pull the whole thing in ~5 min on a typical pod:

```python
from huggingface_hub import snapshot_download

local = snapshot_download(
    repo_id="Natooka/parameter-golf-sp-tokenizers",
    repo_type="dataset",
    local_dir="baselines/parameter_golf",
    # Optional — get just shards, or just the model:
    # allow_patterns=["shards/*.bin", "fineweb_*.model"],
)
```

After the download you have `baselines/parameter_golf/shards/*.bin` + `baselines/parameter_golf/fineweb_16384_bpe.model`. Point your training runner at those paths.

## Training configuration (tokenizer)

| Setting | Value |
|---|---|
| `vocab_size` | 16384 |
| `model_type` | BPE |
| `byte_fallback` | True |
| `character_coverage` | 1.0 |
| `shuffle_input_sentence` | False (locks determinism) |
| `sp_seed` | 1337 |
| Training docs | 5,000,000 (first 5M post-val-split, per manifest convention) |
| Source corpus | [`willdepueoai/parameter-golf`](https://huggingface.co/datasets/willdepueoai/parameter-golf) → `docs_selected.jsonl` |
| Source revision | `9bb295ddab0e05d785b879661af7260fed5140fc` |
| SentencePiece | 0.2.1 |

Training was single-threaded in the BPE merge phase (SP 0.2.1 limitation — `num_threads` helps normalization only). Wall-clock on 28 vCPU Xeon 8480+ host: ~25 min SP training + ~30 min full-corpus tokenization.

## Reproducing from scratch

```bash
python scripts/build_sp_shards.py \
  --docs-path path/to/docs_selected.jsonl \
  --vocab-size 16384 \
  --sp-seed 1337 \
  --sp-train-docs 5000000 \
  --num-workers 28
```

Byte-identical outputs are guaranteed within a matching `(vocab_size, sp_seed, num_workers)` triple — SP's multi-threaded merge counting can drift on tie-breaks across thread counts. Use the same `--num-workers` for cross-machine determinism, or pin to `--num-workers 1` for strict identity.

## License

CC-BY 4.0 for our artifacts (tokenizer + pre-tokenized shards). Upstream `docs_selected.jsonl` subject to the Parameter Golf competition's terms (from `willdepueoai/parameter-golf`).