# TinyCardioUNet: IMU-to-ECG Translation with Graph-Encoded Inter-Axis Dependencies and Tensor Decomposition-Based Parameter Reduction

> Source: <https://www.machinebrief.com/news/tinycardiounet-imu-to-ecg-translation-with-graph-encoded-int-nts5>
> Published: 2026-09-25 04:00:00+00:00

# TinyCardioUNet: IMU-to-ECG Translation with Graph-Encoded Inter-Axis Dependencies and Tensor Decomposition-Based Parameter Reduction

By Seungwoo Han, Ingon Chanpornpakdi, Motoi Noda, Puwadej Leelasiri, Ibuki Hiruma, Toshihisa TanakaSource: 

[arXiv cs.LG](https://arxiv.org/list/cs.LG/recent)
arXiv:2609.29322v1 Announce Type: new 
Abstract: Estimating electrocardiography (ECG) from a chest-worn inertial measurement unit (IMU) enables continuous heart rate (HR) monitoring without the discomfort of electrodes. We propose TinyCardioUNet, a lightweight UNet that uses all six IMU axes without prior channel selection, refines its bottleneck with a graph 

[neural network](https://www.machinebrief.com/glossary/neural-network)that encodes inter-axis dependencies, and employs tensor decomposition with automatic variational Bayesian rank selection for[parameter](https://www.machinebrief.com/glossary/parameter)reduction. On a public dataset, TinyCardioUNet achieves an RMSE of $0.098$ and a Pearson correlation coefficient of $0.677$ with only $36.0$k parameters and remains comparatively robust to additive noise, demonstrating accurate ECG reconstruction with a compact model.
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