1 STMAE

This is the official implementation of paper "Spatial-Temporal Masked Autoencoder for Multi-Device Wearable Human Activity Recognition". Accepted by PACM IMWUT / UbiComp 2024.

The widespread adoption of wearable devices has led to a surge in the development of multi-device wearable human activity recognition (WHAR) systems. Despite the promise of self-supervised learning (SSL) in WHAR, the majority of studies have not considered missing device scenarios in multi-device WHAR. To bridge this gap, we propose a multi-device SSL WHAR method termed Spatial-Temporal Masked Autoencoder (STMAE). STMAE captures discriminative activity representations by utilizing the asymmetrical encoder-decoder structure and two-stage spatial-temporal masking strategy, which can exploit the spatial-temporal correlations in multi-device data to improve the performance of SSL WHAR, especially on missing device scenarios.

2 Data Preparation

For your convenience, the preprocessed data is provided here.

• Put the preprocessed data into the following directory structure

- dataset/
 - opp/
   - opp_30_60/
      ... # preprocessed data of Opportunity
 - realworld/
   - realworld_50_150/
      ... # preprocessed data of RealWorld
 - realdisp/
   - realdisp_50_150/
      ... # preprocessed data of Realdisp
 - pamap/
   - pamap_100_300/
      ... # preprocessed data of PAMAP

Links of raw datasets:

• OPPORTUNITY: https://archive.ics.uci.edu/ml/datasets/OPPORTUNITY+Activity+Recognition
• RealWorld: https://sensor.informatik.uni-mannheim.de
• Realdisp: https://archive.ics.uci.edu/ml/datasets/REALDISP+Activity+Recognition+Dataset
• PAMAP: https://archive.ics.uci.edu/dataset/231/pamap2+physical+activity+monitoring

3 Training & Testing

Here is the descriptions about the arguments:

Argument	Description
test_user	Test user (default=[0])
dataset	Dataset name (default='opp')
gpu	Set specific GPU (default=None)
model_file	Pretrain model file (default=None)
label_index	Label index (default=23)
seed	Seed (default=1)
save_model	The saved model name (default='model')

You can change the config depending on what you want:

python main.py --test_user <test_user>  --dataset <dataset> --gpu <gpu>  --model_file <model_file>  --label_index <label_index> --seed <seed> --save_model <save_model>

4 Citation

If you find this work useful, please consider to cite as follows:

@article{miao2023spatial,
    title={Spatial-temporal masked autoencoder for multi-device wearable human activity recognition},
    author={Miao, Shenghuan and Chen, Ling and Hu, Rong},
    journal={Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies},
    volume={7},
    number={4},
    pages={1--25},
    year={2023},
    publisher={ACM New York, NY, USA}
}

5 Acknowledgements

The authors wish to thank the anonymous reviewers for their constructive comments on this work. This repo is based on dapowan/LIMU-BERT-Public and facebookresearch/mae. Great thanks to the original authors for their work.