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STraTS: Self-Supervised Transformer for Sparse and Irregularly Sampled Multivariate Clinical Time-Series

This repo contains an official re-implementation of STraTS in pytorch. <br> Paper: https://arxiv.org/pdf/2107.14293.pdf

Important changes

• We included implementations for the following models: STraTS, GRU-D, InterpNet, GRU, TCN, SaND
• For STraTS, we removed LayerNorm and replaced ReLU activations in the FFN with GELU, as this improved the performance.
• We used mostly similar hyperparameters for both the datasets, and used the same hidden dimension of 64 for all models.
• Taking inspiration from GRU-D, which uses the same dropout mask at each input time-step, resulting in masking out some variables, we also drop a fraction of variables from the input while training STraTS.
• These changes, along with some possible differences arising from Pytorch's inbuilt modules, make some of the results deviate from the original numbers published in the paper.

Conda env setup

conda create -n strats python=3.10.9
source activate strats
pip install pytz pandas tqdm matplotlib 
pip install torch==2.0.0+cu117 torchvision==0.15.1+cu117 torchaudio==2.0.1 --index-url https://download.pytorch.org/whl/cu117
pip install transformers==4.35.2
pip install scikit-learn==1.2.2

Dataset preprocessing

Download PhysioNet2012 dataset from https://physionet.org/content/challenge-2012/1.0.0/. <br> Download MIMIC-III from https://physionet.org/content/mimiciii/1.4/, <br> Update "RAW_DATA_PATH" variable in the preprocessing scripts and run them.

python preprocess_physionet_2012.py
python preprocess_mimic_iii_large.py

Training and evaluation

The shell script run_main.sh contains the commands for training and evaluating each of the supported models.

chmod +x run_main.sh
./run_main.sh

Results from run_main.sh

Citation

If you found this work useful, please cite our paper:

@article{tipirneni2022self,
  title={Self-supervised transformer for sparse and irregularly sampled multivariate clinical time-series},
  author={Tipirneni, Sindhu and Reddy, Chandan K},
  journal={ACM Transactions on Knowledge Discovery from Data (TKDD)},
  volume={16},
  number={6},
  pages={1--17},
  year={2022},
  publisher={ACM New York, NY}
}