pytorch jax en dataset:PubMed transformers bert bluebert license:cc0-1.0
---
language: 
- en
tags:
- bert
- bluebert
license: cc0-1.0
datasets:
- PubMed

---

# BlueBert-Base, Uncased, PubMed

## Model description

A BERT model pre-trained on PubMed abstracts.

## Intended uses & limitations

#### How to use

Please see https://github.com/ncbi-nlp/bluebert

## Training data

We provide [preprocessed PubMed texts](https://ftp.ncbi.nlm.nih.gov/pub/lu/Suppl/NCBI-BERT/pubmed_uncased_sentence_nltk.txt.tar.gz) that were used to pre-train the BlueBERT models. 
The corpus contains ~4000M words extracted from the [PubMed ASCII code version](https://www.ncbi.nlm.nih.gov/research/bionlp/APIs/BioC-PubMed/). 

Pre-trained model: https://huggingface.co/bert-large-uncased

## Training procedure

*  lowercasing the text
*  removing speical chars `\x00`-`\x7F`
*  tokenizing the text using the [NLTK Treebank tokenizer](https://www.nltk.org/_modules/nltk/tokenize/treebank.html)

Below is a code snippet for more details.

```python
value = value.lower()
value = re.sub(r'[\r\n]+', ' ', value)
value = re.sub(r'[^\x00-\x7F]+', ' ', value)

tokenized = TreebankWordTokenizer().tokenize(value)
sentence = ' '.join(tokenized)
sentence = re.sub(r"\s's\b", "'s", sentence)
```

### BibTeX entry and citation info

```bibtex
@InProceedings{peng2019transfer,
  author    = {Yifan Peng and Shankai Yan and Zhiyong Lu},
  title     = {Transfer Learning in Biomedical Natural Language Processing: An Evaluation of BERT and ELMo on Ten Benchmarking Datasets},
  booktitle = {Proceedings of the 2019 Workshop on Biomedical Natural Language Processing (BioNLP 2019)},
  year      = {2019},
  pages     = {58--65},
}
```

### Acknowledgments

This work was supported by the Intramural Research Programs of the National Institutes of Health, National Library of
Medicine and Clinical Center. This work was supported by the National Library of Medicine of the National Institutes of Health under award number 4R00LM013001-01.

We are also grateful to the authors of BERT and ELMo to make the data and codes publicly available.

We would like to thank Dr Sun Kim for processing the PubMed texts.

### Disclaimer

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