Multi-way Graph Signal Processing on Tensors: Integrative analysis of irregular geometries

TL;DR

This paper reviews the extension of graph signal processing to multi-way tensor data, enabling analysis of complex irregular structures across multiple dimensions for improved data understanding.

Contribution

It introduces a unified framework for applying GSP to multi-way tensors, enhancing classical methods to handle complex irregular geometries in tensor data.

Findings

Unified GSP framework for tensors

Improved tensor analysis methods

Future directions for multi-way GSP

Abstract

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.