huggingface--transformers/docs/source/en/model_doc/bert-japanese.md

This model was contributed to Hugging Face Transformers on 2020-11-16.

BertJapanese

Overview

The BERT models trained on Japanese text.

There are models with two different tokenization methods:

• Tokenize with MeCab and WordPiece. This requires some extra dependencies, fugashi which is a wrapper around MeCab.
• Tokenize into characters.

To use MecabTokenizer, you should pip install transformers["ja"] (or pip install -e .["ja"] if you install from source) to install dependencies.

See details on cl-tohoku repository.

Example of using a model with MeCab and WordPiece tokenization:

import torch
from transformers import AutoModel, AutoTokenizer

bertjapanese = AutoModel.from_pretrained("cl-tohoku/bert-base-japanese", device_map="auto")
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").to(model.device)

print(tokenizer.decode(inputs["input_ids"][0]))
[CLS] 吾輩 は 猫 で ある 。 [SEP]

outputs = bertjapanese(**inputs)

Example of using a model with Character tokenization:

bertjapanese = AutoModel.from_pretrained("cl-tohoku/bert-base-japanese-char", device_map="auto")
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").to(model.device)

print(tokenizer.decode(inputs["input_ids"][0]))
[CLS] 吾 輩 は 猫 で あ る 。 [SEP]

outputs = bertjapanese(**inputs)

This model was contributed by cl-tohoku.

This implementation is the same as BERT, except for tokenization method. Refer to BERT documentation for API reference information.

BertJapaneseTokenizer

autodoc BertJapaneseTokenizer