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NCBI BERT

***** New July 11th, 2019: preprocessed PubMed texts *****

We uploaded the preprocessed PubMed texts that were used to pre-train the NCBI_BERT models.

This repository provides codes and models of NCBI BERT, pre-trained on PubMed abstracts and clinical notes (MIMIC-III). Please refer to our paper Transfer Learning in Biomedical Natural Language Processing: An Evaluation of BERT and ELMo on Ten Benchmarking Datasets for more details.

Pre-trained models and benchmark datasets

The pre-trained NCBI BERT weights, vocab, and config files can be downloaded from:

The benchmark datasets can be downloaded from https://github.com/ncbi-nlp/BLUE_Benchmark

Fine-tuning NCBI BERT

We assume the NCBI BERT model has been downloaded at $NCBI_BERT_DIR, and the dataset has been downloaded at $DATASET_DIR.

Add local directory to $PYTHONPATH if needed.

export PYTHONPATH=.;$PYTHONPATH

Sentence similarity

CUDA_VISIBLE_DEVICES=2 python bert_ncbi/run_ncbi_sts.py \
  --task_name='sts' \
  --do_train=true \
  --do_eval=false \
  --do_test=true \
  --vocab_file=$NCBI_BERT_DIR/vocab.txt \
  --bert_config_file=$NCBI_BERT_DIR/bert_config.json \
  --init_checkpoint=$NCBI_BERT_DIR/bert_model.ckpt \
  --max_seq_length=128 \
  --num_train_epochs=30.0 \
  --do_lower_case=true \
  --data_dir=$DATASET_DIR \
  --output_dir=$OUTPUT_DIR

Named Entity Recognition

CUDA_VISIBLE_DEVICES=1 python bert_ncbi/run_ncbi_ner.py \
  --do_prepare=true \
  --do_train=true \
  --do_eval=true \
  --do_predict=true \
  --task_name="bc5cdr" \
  --vocab_file=$NCBI_BERT_DIR/vocab.txt \
  --bert_config_file=$NCBI_BERT_DIR/bert_config.json \
  --init_checkpoint=$NCBI_BERT_DIR/bert_model.ckpt \
  --num_train_epochs=30.0 \
  --do_lower_case=False \
  --data_dir=$DATASET_DIR \
  --output_dir=$OUTPUT_DIR

The task name can be

  • bc5cdr: BC5CDR chemical or disease task
  • clefe: ShARe/CLEFE task

Relation Extraction

CUDA_VISIBLE_DEVICES=0 python bert_ncbi/run_ncbi.py \
    --do_train=true \
    --do_eval=false \
    --do_predict=true \
    --task_name="chemprot" \
    --vocab_file=$NCBI_BERT_DIR/vocab.txt \
    --bert_config_file=$NCBI_BERT_DIR/bert_config.json \
    --init_checkpoint=$NCBI_BERT_DIR/bert_model.ckpt \
    --num_train_epochs=10.0 \
    --data_dir=$DATASET_DIR \
    --output_dir=$OUTPUT_DIR \
    --do_lower_case=False

The task name can be

  • chemprot: BC6 ChemProt task
  • ddi: DDI 2013 task
  • i2b2_2010: I2B2 2010 task

Document multilabel classification

CUDA_VISIBLE_DEVICES=0 python bert_ncbi/run_ncbi_multi_labels.py \
  --task_name="hoc" \
  --do_train=true \
  --do_eval=true \
  --do_predict=true \
  --vocab_file=$NCBI_BERT_DIR/vocab.txt \
  --bert_config_file=$NCBI_BERT_DIR/bert_config.json \
  --init_checkpoint=$NCBI_BERT_DIR/bert_model.ckpt \
  --max_seq_length=128 \
  --train_batch_size=4 \
  --learning_rate=2e-5 \
  --num_train_epochs=3 \
  --num_classes=20 \
  --num_aspects=10 \
  --aspect_value_list="0,1" \
  --data_dir=$DATASET_DIR \
  --output_dir=$OUTPUT_DIR

Inference task

CUDA_VISIBLE_DEVICES=0 python bert_ncbi/run_ncbi.py \
    --do_train=true \
    --do_eval=false \
    --do_predict=true \
    --task_name="mednli" \
    --vocab_file=$NCBI_BERT_DIR/vocab.txt \
    --bert_config_file=$NCBI_BERT_DIR/bert_config.json \
    --init_checkpoint=$NCBI_BERT_DIR/bert_model.ckpt \
    --num_train_epochs=10.0 \
    --data_dir=$DATASET_DIR \
    --output_dir=$OUTPUT_DIR \
    --do_lower_case=False

Preprocessed PubMed texts

We provide preprocessed PubMed texts that were used to pre-train the NCBI BERT models. The corpus contains ~4000M words extracted from the PubMed ASCII code version. Other operations include

Below is a code snippet for more details.

   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)

Pre-training with BERT

Afterwards, we used the following code to generate pre-training data. Please see https://github.com/google-research/bert for more details.

python bert/create_pretraining_data.py \
  --input_file=pubmed_uncased_sentence_nltk.txt \
  --output_file=pubmed_uncased_sentence_nltk.tfrecord \
  --vocab_file=bert_uncased_L-12_H-768_A-12_vocab.txt \
  --do_lower_case=True \
  --max_seq_length=128 \
  --max_predictions_per_seq=20 \
  --masked_lm_prob=0.15 \
  --random_seed=12345 \
  --dupe_factor=5

We used the following code to train the BERT model. Please do not include init_checkpoint if you are pre-training from scratch. Please see https://github.com/google-research/bert for more details.

python run_pretraining.py \
  --input_file=pubmed_uncased_sentence_nltk.tfrecord \
  --output_dir=$NCBI_BERT_DIR \
  --do_train=True \
  --do_eval=True \
  --bert_config_file=$NCBI_BERT_DIR/bert_config.json \
  --init_checkpoint=$NCBI_BERT_DIR/bert_model.ckpt \
  --train_batch_size=32 \
  --max_seq_length=128 \
  --max_predictions_per_seq=20 \
  --num_train_steps=20000 \
  --num_warmup_steps=10 \
  --learning_rate=2e-5

Citing NCBI BERT

@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},
}

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 K99LM013001-01.

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

This tool shows the results of research conducted in the Computational Biology Branch, NCBI. The information produced on this website is not intended for direct diagnostic use or medical decision-making without review and oversight by a clinical professional. Individuals should not change their health behavior solely on the basis of information produced on this website. NIH does not independently verify the validity or utility of the information produced by this tool. If you have questions about the information produced on this website, please see a health care professional. More information about NCBI's disclaimer policy is available.