Tokenizer-GPT3 base on PHP

This Project is fork from Gioni06/GPT3Tokenizer
Just do some changes for PHP 7.4 compatibility

This is a PHP port of the GPT-3 tokenizer. It is based on the original Python implementation and the Nodejs implementation.

GPT-2 and GPT-3 use a technique called byte pair encoding to convert text into a sequence of integers, which are then used as input for the model. When you interact with the OpenAI API, you may find it useful to calculate the amount of tokens in a given text before sending it to the API.

If you want to learn more, read the Summary of the tokenizers from Hugging Face.

Installation

composer require ze/tokenizer-gpt3

Use the configuration Class

$defaultConfig = new Gpt3TokenizerConfig();

$customConfig = new Gpt3TokenizerConfig();
$customConfig
    ->vocabPath('custom_vocab.json') 
    ->mergesPath('custom_merges.txt')
    ->useCache(false)

A note on caching

The tokenizer will try to use apcu for caching, if that is not available it will use a plain PHP array. You will see slightly better performance for long texts when using the cache. The cache is enabled by default.

Encode a text

$config = new Gpt3TokenizerConfig();
$tokenizer = new Gpt3Tokenizer($config);
$text = "This is some text";
$tokens = $tokenizer->encode($text);
// [1212,318,617,2420]

Decode a text

$config = new Gpt3TokenizerConfig();
$tokenizer = new Gpt3Tokenizer($config);
$tokens = [1212,318,617,2420]
$text = $tokenizer->decode($tokens);
// "This is some text"

Count the number of tokens in a text

$config = new Gpt3TokenizerConfig();
$tokenizer = new Gpt3Tokenizer($config);
$text = "This is some text";
$numberOfTokens = $tokenizer->count($text);
// 4

License

This project uses the Apache License 2.0 license. See the LICENSE file for more information.