---

language: ja

license: cc-by-sa-4.0

tags:

- finance

datasets:

- securities reports
- summaries of financial results

widget:

- text: 流動[MASK]は、1億円となりました。

---

# Additional pretrained BERT base Japanese finance 

This is a [BERT](https://github.com/google-research/bert) model pretrained on texts in the Japanese language.

The codes for the pretraining are available at [retarfi/language-pretraining](https://github.com/retarfi/language-pretraining/tree/v1.0).

## Model architecture

The model architecture is the same as BERT small in the [original BERT paper](https://arxiv.org/abs/1810.04805); 12 layers, 768 dimensions of hidden states, and 12 attention heads.

## Training Data

The models are additionally trained on financial corpus from [Tohoku University's BERT base Japanese model (cl-tohoku/bert-base-japanese)](https://huggingface.co/cl-tohoku/bert-base-japanese).

The financial corpus consists of 2 corpora:

- Summaries of financial results from October 9, 2012, to December 31, 2020
- Securities reports from February 8, 2018, to December 31, 2020

The financial corpus file consists of approximately 27M sentences.


## Tokenization

You can use tokenizer [Tohoku University's BERT base Japanese model (cl-tohoku/bert-base-japanese)](https://huggingface.co/cl-tohoku/bert-base-japanese).

You can use the tokenizer:

```
tokenizer = transformers.BertJapaneseTokenizer.from_pretrained('cl-tohoku/bert-base-japanese')
```

## Training

The models are trained with the same configuration as BERT base in the [original BERT paper](https://arxiv.org/abs/1810.04805); 512 tokens per instance, 256 instances per batch, and 1M training steps.

## Citation

**There will be another paper for this pretrained model. Be sure to check here again when you cite.**

```
@inproceedings{suzuki2022additional-fin-bert,
  title={事前学習と追加事前学習による金融言語モデルの構築と検証},
  % title={Construction and Validation of a Pre-Training and Additional Pre-Training Financial Language Model},
  author={鈴木 雅弘 and 坂地 泰紀 and 平野 正徳 and 和泉 潔},
  % author={Masahiro Suzuki and Hiroki Sakaji and Masanori Hirano and Kiyoshi Izumi},
  booktitle={人工知能学会第28回金融情報学研究会(SIG-FIN)},
  % booktitle={Proceedings of JSAI Special Interest Group on Financial Infomatics (SIG-FIN) 28},
  pages={132-137},
  year={2022}
}
```

## Licenses

The pretrained models are distributed under the terms of the [Creative Commons Attribution-ShareAlike 4.0](https://creativecommons.org/licenses/by-sa/4.0/).

## Acknowledgments

This work was supported by JSPS KAKENHI Grant Number JP21K12010 and JST-Mirai Program Grant Number JPMJMI20B1.