---
library_name: transformers
tags: []
---

# Model Card

<!-- Provide a quick summary of what the model is/does. -->
Our **JpharmaBERT (base)** is a continually pre-trained version of the BERT model ([tohoku-nlp/bert-base-japanese-v3](https://huggingface.co/tohoku-nlp/bert-base-japanese-v3)), further trained on pharmaceutical data — the same dataset used for [eques/jpharmatron](https://huggingface.co/EQUES/JPharmatron-7B).

# Examoke Usage

<!-- Address questions around how the model is intended to be used, including the foreseeable users of the model and those affected by the model. -->
```python
import torch
from transformers import AutoModelForMaskedLM, AutoTokenizer, pipeline

model = AutoModelForMaskedLM.from_pretrained("EQUES/jpharma-bert-base", torch_dtype=torch.bfloat16)
tokenizer = AutoTokenizer.from_pretrained("EQUES/jpharma-bert-base")
fill_mask = pipeline("fill-mask", model=model, tokenizer=tokenizer)

results = fill_mask("水は化学式で[MASK]2Oです。")

for result in results:
    print(result)
# {'score': 0.49609375, 'token': 55, 'token_str': 'H', 'sequence': '水は化学式でH2Oです。'}
# {'score': 0.11767578125, 'token': 29257, 'token_str': 'Na', 'sequence': '水は化学式でNa2Oです。'}
# {'score': 0.047607421875, 'token': 61, 'token_str': 'N', 'sequence': '水は化学式でN2Oです。'}
# {'score': 0.038330078125, 'token': 16966, 'token_str': 'CH', 'sequence': '水は化学式でCH2Oです 。'}
# {'score': 0.0255126953125, 'token': 66, 'token_str': 'S', 'sequence': '水は化学式でS2Oです 。'}
```

## Training Details

### Training Data

<!-- This should link to a Dataset Card, perhaps with a short stub of information on what the training data is all about as well as documentation related to data pre-processing or additional filtering. -->
We used the same dataset as [eques/jpharmatron](https://huggingface.co/EQUES/JPharmatron-7B) for training our JpharmaBERT, which consists of:
- Japanese text data (2B tokens) collected from pharmaceutical documents such as academic papers and package inserts  
- English data (8B tokens) obtained from PubMed abstracts  
- Pharmaceutical-related data (1.2B tokens) extracted from the multilingual CC100 dataset  

After removing duplicate entries across these sources, the final dataset contains approximately 9 billion tokens.  
(For details, please refer to our paper about Jpharmatron: [link](https://arxiv.org/abs/2505.16661))

#### Training Hyperparameters

The model was continually pre-trained with the following settings:

- Mask probability: 15%
- Maximum sequence length: 512 tokens
- Number of training epochs: 6
- Learning rate: 1e-4  
- Warm-up steps: 10,000 
- Per-device training batch size: 64

## Model Card Authors

Created by Takuro Fujii (tkr.fujii.ynu@gmail.com)