Multi-way Graph Signal Processing on Tensors: Integrative analysis of irregular geometries
This work addresses the need for signal processing tools for multi-way tensor data in fields like sensor networks, but it is incremental as it reviews and synthesizes existing approaches rather than introducing new methods.
The paper reviews frameworks that extend graph signal processing to multi-way tensor data, aiming to better utilize the structure of data on irregular geometries, and synthesizes current efforts and future directions in this area.
Graph signal processing (GSP) is an important methodology for studying data residing on irregular structures. As acquired data is increasingly taking the form of multi-way tensors, new signal processing tools are needed to maximally utilize the multi-way structure within the data. In this paper, we review modern signal processing frameworks generalizing GSP to multi-way data, starting from graph signals coupled to familiar regular axes such as time in sensor networks, and then extending to general graphs across all tensor modes. This widely applicable paradigm motivates reformulating and improving upon classical problems and approaches to creatively address the challenges in tensor-based data. We synthesize common themes arising from current efforts to combine GSP with tensor analysis and highlight future directions in extending GSP to the multi-way paradigm.