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transformers/docs/source/ja/model_doc/bert-japanese.md
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2026-06-05 16:53:03 +08:00

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# BertJapanese
## Overview
BERT モデルは日本語テキストでトレーニングされました。
2 つの異なるトークン化方法を備えたモデルがあります。
- MeCab と WordPiece を使用してトークン化します。これには、[MeCab](https://taku910.github.io/mecab/) のラッパーである [fugashi](https://github.com/polm/fugashi) という追加の依存関係が必要です。
- 文字にトークン化します。
*MecabTokenizer* を使用するには、`pip installTransformers["ja"]` (または、インストールする場合は `pip install -e .["ja"]`) する必要があります。
ソースから)依存関係をインストールします。
[cl-tohakuリポジトリの詳細](https://github.com/cl-tohaku/bert-japanese)を参照してください。
MeCab および WordPiece トークン化でモデルを使用する例:
```python
>>> import torch
>>> from transformers import AutoModel, AutoTokenizer
>>> bertjapanese = AutoModel.from_pretrained("cl-tohoku/bert-base-japanese")
>>> tokenizer = AutoTokenizer.from_pretrained("cl-tohoku/bert-base-japanese")
>>> ## Input Japanese Text
>>> line = "吾輩は猫である。"
>>> inputs = tokenizer(line, return_tensors="pt")
>>> print(tokenizer.decode(inputs["input_ids"][0]))
[CLS] 吾輩 ある [SEP]
>>> outputs = bertjapanese(**inputs)
```
文字トークン化を使用したモデルの使用例:
```python
>>> bertjapanese = AutoModel.from_pretrained("cl-tohoku/bert-base-japanese-char")
>>> tokenizer = AutoTokenizer.from_pretrained("cl-tohoku/bert-base-japanese-char")
>>> ## Input Japanese Text
>>> line = "吾輩は猫である。"
>>> inputs = tokenizer(line, return_tensors="pt")
>>> print(tokenizer.decode(inputs["input_ids"][0]))
[CLS] [SEP]
>>> outputs = bertjapanese(**inputs)
```
<Tip>
- この実装はトークン化方法を除いて BERT と同じです。その他の使用例については、[BERT のドキュメント](bert) を参照してください。
</Tip>
このモデルは[cl-tohaku](https://huggingface.co/cl-tohaku)から提供されました。
## BertJapaneseTokenizer
[[autodoc]] BertJapaneseTokenizer