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Parameter Golf FineWeb 10B — Byte260 Tokenization
Byte-level tokenized version of the FineWeb 10B dataset for the Parameter Golf competition.
The HuggingFace repo (willdepueoai/parameter-golf) only currently provides fineweb10B_sp1024 in both the manifest and the dataset folders, so I whipped this up instead.
It seems to work OK, but use at your own risk as it's vibe coded!
Tokenizer
byte260: 256 UTF-8 byte tokens + 4 special tokens (pad=0, bos=1, eos=2, unk=3). Byte values are offset by 4, so token ID = byte_value + 4.
- Vocab size: 260
- Each token represents exactly 1 byte
Dataset Stats
| Split | Documents | Tokens | Shards |
|---|---|---|---|
| Train | 15,318,808 | 47,571,635,348 | 476 |
| Val | 50,000 | 151,130,645 | 2 |
| Total | 15,368,808 | 47,722,765,993 | 478 |
File Format
Binary shards (uint16, little-endian) with a 1024-byte header:
- Header[0]: magic = 20240520
- Header[1]: version = 1
- Header[2]: number of tokens in shard
- Followed by token data as uint16
Each shard contains ~100M tokens (last shard may be smaller).
Usage
Download with the Parameter Golf data loader:
python data/cached_challenge_fineweb.py --variant byte260 --train-shards 80
Or set the environment variables to point at this repo:
export MATCHED_FINEWEB_REPO_ID=nicholasbailey87/parameter-golf-byte260
export MATCHED_FINEWEB_REMOTE_ROOT_PREFIX=""
python data/cached_challenge_fineweb.py --variant byte260 --train-shards 80
Source
Generated from willdepueoai/parameter-golf docs_selected.jsonl using data/download_hf_docs_and_tokenize.py with a pure-byte tokenizer config.
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