bitty-tokenizer 0.1.5

A bitty BPE tokenizer library

Bitty, clean code for the (byte-level) Byte Pair Encoding (BPE) algorithm commonly used in LLM tokenization. The BPE algorithm is "byte-level" because it runs on UTF-8 encoded strings.

This algorithm was popularized for LLMs by the GPT-2 paper and the associated GPT-2 code release from OpenAI. Sennrich et al. 2015 is cited as the original reference for the use of BPE in NLP applications. Today, all modern LLMs (e.g. GPT, Llama, Mistral) use this algorithm to train their tokenizers.

Tokenizers are the reason why Language models work so well, hallucinates other time, doesnt work well in finance industry, and can make or break a system

Find medium link explaining tokenization here : https://medium.com/@mohitdulani/train-a-tokenizer-from-scratch-4a33450d42ee

To Download the data use these commands :

mkdir -p data
cd data

wget https://huggingface.co/datasets/roneneldan/TinyStories/resolve/main/TinyStoriesV2-GPT4-train.txt
wget https://huggingface.co/datasets/roneneldan/TinyStories/resolve/main/TinyStoriesV2-GPT4-valid.txt

or simply run the download.sh script (works on Linux, Mac, or Windows with WSL/Git Bash):

bash data_download.sh

Lecture

For more indepth video lecture refer to :

Andrej Karpathy on Tokenizer