alexkstern/

fineweb-nanochatbpe-55B

FineWeb-Edu (from karpathy/fineweb-edu-100b-shuffle), pre-tokenized with the nanochatbpe tokenizer (vocab 65,536) and packaged as flat uint16 token-id .bin files for fast memmap training.

file split tokens

train.bin train 55,000,000,000

val.bin val 52,336,096

train and val are disjoint held-out partitions. Each .bin is a raw little-endian uint16 stream (no header); token count = filesize / 2, and train.meta.json / val.meta.json carry the… See the full description on the dataset page: https://huggingface.co/datasets/alexkstern/fineweb-nanochatbpe-55B.