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docs/source/pt/fast_tokenizers.md
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docs/source/pt/fast_tokenizers.md
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<!--Copyright 2020 The HuggingFace Team. All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
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an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
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specific language governing permissions and limitations under the License.
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⚠️ Note that this file is in Markdown but contain specific syntax for our doc-builder (similar to MDX) that may not be
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rendered properly in your Markdown viewer.
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-->
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# Usando os Tokenizers do 🤗 Tokenizers
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O [`PreTrainedTokenizerFast`] depende da biblioteca [🤗 Tokenizers](https://huggingface.co/docs/tokenizers). O Tokenizer obtido da biblioteca 🤗 Tokenizers pode ser carregado facilmente pelo 🤗 Transformers.
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Antes de entrar nos detalhes, vamos começar criando um tokenizer fictício em algumas linhas:
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```python
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>>> from tokenizers import Tokenizer
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>>> from tokenizers.models import BPE
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>>> from tokenizers.trainers import BpeTrainer
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>>> from tokenizers.pre_tokenizers import Whitespace
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>>> tokenizer = Tokenizer(BPE(unk_token="[UNK]"))
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>>> trainer = BpeTrainer(special_tokens=["[UNK]", "[CLS]", "[SEP]", "[PAD]", "[MASK]"])
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>>> tokenizer.pre_tokenizer = Whitespace()
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>>> files = [...]
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>>> tokenizer.train(files, trainer)
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```
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Agora temos um tokenizer treinado nos arquivos que foram definidos. Nós podemos continuar usando nessa execução ou salvar em um arquivo JSON para re-utilizar no futuro.
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## Carregando diretamente de um objeto tokenizer
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Vamos ver como aproveitar esse objeto tokenizer na biblioteca 🤗 Transformers. A classe [`PreTrainedTokenizerFast`] permite uma instanciação fácil, aceitando o objeto *tokenizer* instanciado como um argumento:
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```python
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>>> from transformers import PreTrainedTokenizerFast
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>>> fast_tokenizer = PreTrainedTokenizerFast(tokenizer_object=tokenizer)
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```
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Esse objeto pode ser utilizado com todos os métodos compartilhados pelos tokenizers dos 🤗 Transformers! Vá para [a página do tokenizer](main_classes/tokenizer) para mais informações.
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## Carregando de um arquivo JSON
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Para carregar um tokenizer de um arquivo JSON vamos primeiro começar salvando nosso tokenizer:
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```python
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>>> tokenizer.save("tokenizer.json")
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```
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A pasta para qual salvamos esse arquivo pode ser passada para o método de inicialização do [`PreTrainedTokenizerFast`] usando o `tokenizer_file` parâmetro:
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```python
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>>> from transformers import PreTrainedTokenizerFast
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>>> fast_tokenizer = PreTrainedTokenizerFast(tokenizer_file="tokenizer.json")
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```
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Esse objeto pode ser utilizado com todos os métodos compartilhados pelos tokenizers dos 🤗 Transformers! Vá para [a página do tokenizer](main_classes/tokenizer) para mais informações.
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