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BERT small Japanese finance

This is a BERT model pretrained on texts in the Japanese language.

The codes for the pretraining are available at retarfi/language-pretraining.

Model architecture

The model architecture is the same as BERT small in the original ELECTRA paper; 12 layers, 256 dimensions of hidden states, and 4 attention heads.

Training Data

The models are trained on the Japanese version of Wikipedia.

The training corpus is generated from the Japanese version of Wikipedia, using Wikipedia dump file as of June 1, 2021.

The corpus file is 2.9GB, consisting of approximately 20M sentences.


The texts are first tokenized by MeCab with IPA dictionary and then split into subwords by the WordPiece algorithm.

The vocabulary size is 32768.


The models are trained with the same configuration as BERT small in the original ELECTRA paper; 128 tokens per instance, 128 instances per batch, and 1.45M training steps.


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

  % title={Construction and Validation of a Pre-Trained Language Model Using Financial Documents},
  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={Proceedings of JSAI Special Interest Group on Financial Infomatics (SIG-FIN) 27},


The pretrained models are distributed under the terms of the Creative Commons Attribution-ShareAlike 4.0.


This work was supported by JSPS KAKENHI Grant Number JP21K12010.

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Dataset used to train izumi-lab/bert-small-japanese