A fast RWKV Tokenizer written in Rust that supports the World Tokenizer used by the RWKV v5 and v6 models.

Install the rwkv-tokenizer python module:

$ pip install pyrwkv-tokenizer

>>> import pyrwkv_tokenizer
>>> tokenizer = pyrwkv_tokenizer.RWKVTokenizer()
>>> tokenizer.encode("Today is a beautiful day. 今天是美好的一天。")
[33520, 4600, 332, 59219, 21509, 47, 33, 10381, 11639, 13091, 15597, 11685, 14734, 10250, 11639, 10080]
>>> tokenizer.decode([33520, 4600, 332, 59219, 21509, 47, 33, 10381, 11639, 13091, 15597, 11685, 14734, 10250, 11639, 10080])
'Today is a beautiful day. 今天是美好的一天。'

We compared the encoding results of the Rust RWKV Tokenizer and the original tokenizer using the English Wikipedia and Chinese poetries datasets. Both results are identical. The Rust RWKV Tokenizer also passes the original tokenizer's unit test. The following steps describe how to do the unit test:

$ pip install pytest pyrwkv-tokenizer
$ git clone https://github.com/cahya-wirawan/rwkv-tokenizer.git
$ cd rwkv-tokenizer
$ pytest

We did a performance comparison on the simple English Wikipedia dataset 20220301.simple* among following tokenizer:

• The original RWKV tokenizer (BlinkDL)
• Huggingface implementaion of RWKV tokenizer
• Huggingface LLama tokenizer
• Huggingface Mistral tokenizer
• Bert tokenizer
• OpenAI Tiktoken
• The Rust RWKV tokenizer

The comparison is done using this jupyter notebook in a M2 Mac mini. The Rust RWKV tokenizer is around 17x faster than the original tokenizer and 9.6x faster than OpenAI Tiktoken.

*The simple English Wikipedia dataset can be downloaded as jsonl file from https://huggingface.co/datasets/cahya/simple-wikipedia/resolve/main/simple-wikipedia.jsonl?download=true

There are still bugs where some characters are not encoded correctly. The bug have been fixed in the version 0.3.0. This tokenizer is my very first Rust program, so it might still have many bugs and silly codes :-)