One Wave to Explain Them All: A Unifying Perspective on Post-hoc Explainability

Gabriel Kasmi, Amandine Brunetto, Thomas FEL, Jayneel Parekh

Keywords: interpretability, feature attribution, wavelet, images, audio, 3D shapes

TL;DR: We generalize gradient-based explainability to the wavelet domain; expanding it to new modalities beyond images and show that it yields novel insights on model understanding..

Abstract: Despite the growing use of deep neural networks in safety-critical decision-making, their inherent black-box nature hinders transparency and interpretability. Explainable AI (XAI) methods have thus emerged to understand a model's internal workings, and notably attribution methods also called Saliency maps. Conventional attribution methods typically identify the locations - the where - of significant regions within an input. However, because they overlook the inherent structure of the input data, these methods often fail to interpret what these regions represent in terms of structural components (e.g., textures in images or transients in sounds). Furthermore, existing methods are usually tailored to a single data modality, limiting their generalizability. In this paper, we propose leveraging the wavelet domain as a robust mathematical foundation for attribution. Our approach, the Wavelet Attribution Method (WAM) extends the existing gradient-based feature attributions into the wavelet domain, providing a unified framework for explaining classifiers across images, audio, and 3D shapes. Empirical evaluations demonstrate that WAM matches or surpasses state-of-the-art methods across faithfulness metrics and models in image, audio, and 3D explainability. Finally, we show how our method explains not only the where - the important parts of the input - but also the what - the relevant patterns in terms of structural components.

Primary Area: interpretability and explainable AI

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Submission Number: 6653