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radarODE-MTL

radarODE-MTL is an open-source repository built on PyTorch and Multi-Task Learning (MTL) framework LibMTL and contains:

Code for Paper:

  1. radarODE: An ODE-embedded deep learning model for contactless ECG reconstruction from millimeter-wave radar
  2. radarODE-MTL: A Multi-Task Learning Framework with Eccentric Gradient Alignment for Robust Radar-Based ECG Reconstruction

Presentations for:

  1. radarODE
  2. radarODE-MTL
  3. Introduction of popular MTL optimization stratigies

Our recent work CFT-RFcardi employed an easy-to-use framework with a pre-processed dataset. We suggest that you have a look at our new work for a quick implementation and validation.

🥳 Any problem please send them in Issues or Email 📧.

Intuitive Explanation and Introduction

Radar-based vital sign monitoring has been invested in for decades, and the community always pursues capturing more fine-grained cardiac signals with better noise robustness (especially for body movement or moving subjects).

This repository contains two of our studies to improve the robustness of ECG recovery using the multi-task learning (MTL) paradigm and ordinary differential equation (ODE), with radarODE mainly improving the robust single-cycle ECG recovery and radarODE-MTL focusing on the long-term ECG recovery eventually.

The core idea of radarODE is to deconstruct the long-term cardiac activities into individual cardiac cycles and leverage the robustness provided by the ODE decoder to generate faithful ECG reference that aids the domain transformation in long-term ECG recovery.

Illustration of robustness under differnt radar qualities

Citation

If you find our work helpful for your research, please cite our paper:

@article{zhang2024radarODE,
  title={{radarODE: An ODE-embedded deep learning model for contactless ECG reconstruction from millimeter-wave radar}}, 
  author={Yuanyuan Zhang and Runwei Guan and Lingxiao Li and Rui Yang and Yutao Yue and Eng Gee Lim},
  journal={IEEE Transactions on Mobile Computing},
  year={2025},
  publisher={IEEE},
  month={Apr.}
}
@article{zhang2024radarODE-MTL,
  title={{radarODE-MTL}: A Multi-task learning tramework with eccentric gradient alignment for robust radar-based {ECG} reconstruction}, 
  author={Yuanyuan Zhang and Rui Yang and Yutao Yue and Eng Gee Lim},
  journal={IEEE Transactions on Instrumentation and Measurement},
  year={2025},
  publisher={IEEE},
  month={Apr.}
}

Dataset Download and Preparation

Please refer to MMECG Dataset for the Dataset downloading.

The file structure is

Dataset
└───obj1_NB_1_
│   │   sst_seg_0.npy
│   │   anchor_seg_0.npy 
│   │   ecg_seg_0.npy
│   │   ...
│   ...
└───obj30_PE_91_
│   │   ...
│   │   sst_seg_215.npy
│   │   anchor_seg_215.npy 
│   │   ecg_seg_215.npy

The input size of the radarODE and radarODE-MTL are the spectrograms with size 50x71x120 (e.g., sst_seg_0.npy), with 71 for frequency and 120 for 4-sec segments. The ground truth ECG, anchor, cycle length can be fomulated as in the paper. You may use the example code MMECG_to_SST to generate SST spectrograms, or any time-frequency representation tools are applicable.

Run the Model

You can find the arguments and settings in:

radarODE-MTL/Projects/radarODE_plus/main.py

The model summary is in:

radarODE-MTL/Projects/radarODE_plus/nets/model.py

Tips

If you only want to realize the ECG recovery and do not care too much about noise robustness, please change here to Given_weight, and directly use 4-sec ECG as ground truth.

More details on the available MTL Architectures, Optimization Strategies and Datasets please refer to LibMTL.

Quick Introduction

The full presentation for radarODE-MTL is shown in

radarODE/Presentations/radarODE_MTL_Presentation.pdf

License

radarODE-MTL is released under the MIT license.