fast-bpe-rs 0.3.3

Fast Byte Pair Encoding (BPE) tokenizer with Python bindings powered by PyO3.

fast-bpe-rs

A blazing-fast Byte Pair Encoding tokenizer — written in Rust, usable from Python.

---

Quick start

Install

pip install fast-bpe-rs

No prebuilt wheel for your platform? pip will compile from source. You'll need a Rust toolchain installed first.

Train

from fast_bpe_rs import BPE

bpe = BPE(r"(?s).+")  # regex pattern for pre-splitting text
bpe.train(258, ["low low low low", "lower lower", "newest newest newest"])

For real corpora, use a GPT-style split pattern:

bpe = BPE(
    r"(?i:'s|'t|'re|'ve|'m|'ll|'d)|[^\r\n\p{L}\p{N}]?\p{L}+|\p{N}{1,3}"
    r"| ?[^\s\p{L}\p{N}]+[\r\n]*|\s*[\r\n]+|\s+(?!\S)|\s+"
)
bpe.train(50_000, corpus_lines)

Encode & Decode

ids = bpe.encode("low lower newest")
text = bpe.decode_to_string(ids)

---

License

Apache 2.0