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  license: apache-2.0
 
 
 
 
 
 
 
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  license: apache-2.0
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+ datasets:
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+ - cc100
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+ - wikipedia
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+ language:
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+ - ja
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+ widget:
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+ - text: 東北大学で[MASK]の研究をしています。
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  ---
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+
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+ # BERT base Japanese (character-level tokenization with whole word masking, CC-100 and jawiki-20230102)
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+ This is a [BERT](https://github.com/google-research/bert) model pretrained on texts in the Japanese language.
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+ This version of the model processes input texts with word-level tokenization based on the Unidic 2.1.2 dictionary (available in [unidic-lite](https://pypi.org/project/unidic-lite/) package), followed by character-level tokenization.
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+ Additionally, the model is trained with the whole word masking enabled for the masked language modeling (MLM) objective.
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+
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+ The codes for the pretraining are available at [cl-tohoku/bert-japanese](https://github.com/cl-tohoku/bert-japanese/).
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+
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+ ## Model architecture
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+
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+ The model architecture is the same as the original BERT base model; 12 layers, 768 dimensions of hidden states, and 12 attention heads.
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+
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+ ## Training Data
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+
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+ The model is trained on the Japanese portion of [CC-100 dataset](https://data.statmt.org/cc-100/) and the Japanese version of Wikipedia.
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+ For Wikipedia, we generated a text corpus from the [Wikipedia Cirrussearch dump file](https://dumps.wikimedia.org/other/cirrussearch/) as of January 2, 2023.
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+ The corpus files generated from CC-100 and Wikipedia are 74.3GB and 4.9GB in size and consist of approximately 392M and 34M sentences, respectively.
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+ For the purpose of splitting texts into sentences, we used [fugashi](https://github.com/polm/fugashi) with [mecab-ipadic-NEologd](https://github.com/neologd/mecab-ipadic-neologd) dictionary (v0.0.7).
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+
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+ ## Tokenization
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+ The texts are first tokenized by MeCab with the Unidic 2.1.2 dictionary and then split into characters.
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+ The vocabulary size is 7027.
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+ We used [fugashi](https://github.com/polm/fugashi) and [unidic-lite](https://github.com/polm/unidic-lite) packages for the tokenization.
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+
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+ ## Training
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+ We trained the model first on the CC-100 corpus for 1M steps and then on the Wikipedia corpus for another 1M steps.
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+ For training of the MLM (masked language modeling) objective, we introduced whole word masking in which all of the subword tokens corresponding to a single word (tokenized by MeCab) are masked at once.
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+ For training of each model, we used a v3-8 instance of Cloud TPUs provided by [TPU Research Cloud](https://sites.research.google/trc/about/).
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+
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+ ## Licenses
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+ The pretrained models are distributed under the Apache License 2.0.
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+ ## Acknowledgments
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+
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+ This model is trained with Cloud TPUs provided by [TPU Research Cloud](https://sites.research.google/trc/about/) program.