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transformers/docs/source/es/fast_tokenizers.md
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# Usa los tokenizadores de 🤗 Tokenizers
[`PreTrainedTokenizerFast`] depende de la biblioteca [🤗 Tokenizers](https://huggingface.co/docs/tokenizers). Los tokenizadores obtenidos desde la biblioteca 🤗 Tokenizers pueden ser
cargados de forma muy sencilla en los 🤗 Transformers.
Antes de entrar en detalles, comencemos creando un tokenizador dummy en unas cuantas líneas:
```python
>>> from tokenizers import Tokenizer
>>> from tokenizers.models import BPE
>>> from tokenizers.trainers import BpeTrainer
>>> from tokenizers.pre_tokenizers import Whitespace
>>> tokenizer = Tokenizer(BPE(unk_token="[UNK]"))
>>> trainer = BpeTrainer(special_tokens=["[UNK]", "[CLS]", "[SEP]", "[PAD]", "[MASK]"])
>>> tokenizer.pre_tokenizer = Whitespace()
>>> files = [...]
>>> tokenizer.train(files, trainer)
```
Ahora tenemos un tokenizador entrenado en los archivos que definimos. Lo podemos seguir utilizando en ese entorno de ejecución (runtime en inglés), o puedes guardarlo
en un archivo JSON para reutilizarlo en un futuro.
## Cargando directamente desde el objeto tokenizador
Veamos cómo utilizar este objeto tokenizador en la biblioteca 🤗 Transformers. La clase
[`PreTrainedTokenizerFast`] permite una instanciación fácil, al aceptar el objeto
*tokenizer* instanciado como argumento:
```python
>>> from transformers import PreTrainedTokenizerFast
>>> fast_tokenizer = PreTrainedTokenizerFast(tokenizer_object=tokenizer)
```
Este objeto ya puede ser utilizado con todos los métodos compartidos por los tokenizadores de 🤗 Transformers! Visita la [página sobre tokenizadores
](main_classes/tokenizer) para más información.
## Cargando desde un archivo JSON
Para cargar un tokenizador desde un archivo JSON, comencemos por guardar nuestro tokenizador:
```python
>>> tokenizer.save("tokenizer.json")
```
La localización (path en inglés) donde este archivo es guardado puede ser incluida en el método de inicialización de [`PreTrainedTokenizerFast`]
utilizando el parámetro `tokenizer_file`:
```python
>>> from transformers import PreTrainedTokenizerFast
>>> fast_tokenizer = PreTrainedTokenizerFast(tokenizer_file="tokenizer.json")
```
Este objeto ya puede ser utilizado con todos los métodos compartidos por los tokenizadores de 🤗 Transformers! Visita la [página sobre tokenizadores
](main_classes/tokenizer) para más información.