GNN-XAR: A Graph Neural Network for Explainable Activity Recognition in Smart Homes
This addresses the need for interpretable AI in healthcare applications like smart home monitoring, though it is incremental as it adapts GNNs for explainability in a specific domain.
The paper tackles the problem of opaque decision-making in sensor-based human activity recognition (HAR) for smart homes by proposing the first explainable Graph Neural Network (GNN), which provides better explanations than state-of-the-art methods and slightly improves recognition rates on two public datasets.
Sensor-based Human Activity Recognition (HAR) in smart home environments is crucial for several applications, especially in the healthcare domain. The majority of the existing approaches leverage deep learning models. While these approaches are effective, the rationale behind their outputs is opaque. Recently, eXplainable Artificial Intelligence (XAI) approaches emerged to provide intuitive explanations to the output of HAR models. To the best of our knowledge, these approaches leverage classic deep models like CNNs or RNNs. Recently, Graph Neural Networks (GNNs) proved to be effective for sensor-based HAR. However, existing approaches are not designed with explainability in mind. In this work, we propose the first explainable Graph Neural Network explicitly designed for smart home HAR. Our results on two public datasets show that this approach provides better explanations than state-of-the-art methods while also slightly improving the recognition rate.