Documentation updates

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Anthony MOI
2020-01-04 23:33:50 -05:00
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# Tokenizers
Provides an implementation of today's most used tokenizers with a focus on performances
and versatility. The goal is to make it as easy as possible to construct a Tokenizer, learn a
vocabulary, and then process some text either in real time or in advance.
Provides an implementation of today's most used tokenizers, with a focus on performances and
versatility.
## What is a Tokenizer
A Tokenizer works as a pipeline taking some raw text as input, going through multiple steps to
finally output a list of `Token`s. The various steps of the pipeline are:
- Some optional `Normalizer`s. An example would be a Unicode normalization step. They take
some raw text as input, and also output raw text `String`.
- An optional `PreTokenizer` which should take some raw text and take care of spliting
as relevant, and pre-processing tokens if needed. Takes a raw text `String` as input, and
outputs a `Vec<String>`.
- A `Model` to do the actual tokenization. An example of `Model` would be `BPE`. Takes
a `Vec<String>` as input, and gives a `Vec<Token>`.
- Some optional `PostProcessor`s. These are in charge of post processing the list of `Token`s
in any relevant way. This includes truncating, adding some padding, ...
A Tokenizer works as a pipeline, processing some raw text as input, to finally output an
`Encoding`.
The various steps of the pipeline are:
## Try the shell
1. The `Normalizer` is in charge of normalizing the text. Common examples of Normalization are
the unicode normalization standards, such as `NFD` or `NFKC`.
2. The `PreTokenizer` is in charge of splitting the text as relevant. The most common way of
splitting text is simply on whitespaces, to manipulate words.
3. The `Model` is in charge of doing the actual tokenization. An example of `Model` would be
`BPE` or `WordPiece`.
4. The `PostProcessor` is in charge of post processing the `Encoding`, to add anything relevant
that a language model would need, like special tokens.
You can try a simple ByteLevel BPE Tokenizer by using the following command. This expects
`vocab.json` and `merges.txt` files, trained with ByteLevel BPE.
## Bindings
```bash
cd tokenizers
wget https://s3.amazonaws.com/models.huggingface.co/bert/gpt2-vocab.json
wget https://s3.amazonaws.com/models.huggingface.co/bert/gpt2-merges.txt
cargo run --release shell --vocab gpt2-vocab.json --merges gpt2-merges.txt
```
We provide bindings to the following languages (more to come!):
- [Python](https://github.com/huggingface/tokenizers/tree/master/bindings/python)

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@ -3,6 +3,16 @@ authors = ["Anthony MOI <m.anthony.moi@gmail.com>"]
edition = "2018"
name = "tokenizers-lib"
version = "0.0.11"
homepage = "https://github.com/huggingface/tokenizers"
repository = "https://github.com/huggingface/tokenizers"
documentation = "https://docs.rs/tokenizers/"
license = "Apache-2.0"
keywords = ["text", "tokenizer", "tokenization", "NLP", "huggingface", "BPE", "WordPiece"]
readme = "README.md"
description = """
Provides an implementation of today's most used tokenizers,
with a focus on performances and versatility.
"""
[lib]
name = "tokenizers"

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#![warn(clippy::all)]
#![doc(html_favicon_url = "https://huggingface.co/favicon.ico")]
#![doc(html_logo_url = "https://huggingface.co/landing/assets/huggingface_logo.svg")]
//!
//! # Tokenizers
//!
//! Provides an implementation of today's most used tokenizers, with a focus on performances and
//! versatility.
//!
//! ## What is a Tokenizer
//!
//! A Tokenizer works as a pipeline, processing some raw text as input, to finally output an
//! `Encoding`.
//! The various steps of the pipeline are:
//!
//! 1. The `Normalizer` is in charge of normalizing the text. Common examples of Normalization are
//! the unicode normalization standards, such as `NFD` or `NFKC`.
//! 2. The `PreTokenizer` is in charge of splitting the text as relevant. The most common way of
//! splitting text is simply on whitespaces, to manipulate words.
//! 3. The `Model` is in charge of doing the actual tokenization. An example of `Model` would be
//! `BPE` or `WordPiece`.
//! 4. The `PostProcessor` is in charge of post processing the `Encoding`, to add anything relevant
//! that a language model would need, like special tokens.
//!
#[macro_use]
extern crate lazy_static;