Time is Not Enough: Time-Frequency based Explanation for Time-Series Black-Box Models

• URL: http://arxiv.org/abs/2408.03636v2
• Date: Mon, 12 Aug 2024 14:39:56 GMT
• Title: Time is Not Enough: Time-Frequency based Explanation for Time-Series Black-Box Models
• Authors: Hyunseung Chung, Sumin Jo, Yeonsu Kwon, Edward Choi,
• Abstract summary: We present Spectral eXplanation (SpectralX), an XAI framework that provides time-frequency explanations for time-series black-box classifiers. We also introduce Feature Importance Approximations (FIA), a new perturbation-based XAI method.
• Score: 12.575427166236844
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Despite the massive attention given to time-series explanations due to their extensive applications, a notable limitation in existing approaches is their primary reliance on the time-domain. This overlooks the inherent characteristic of time-series data containing both time and frequency features. In this work, we present Spectral eXplanation (SpectralX), an XAI framework that provides time-frequency explanations for time-series black-box classifiers. This easily adaptable framework enables users to "plug-in" various perturbation-based XAI methods for any pre-trained time-series classification models to assess their impact on the explanation quality without having to modify the framework architecture. Additionally, we introduce Feature Importance Approximations (FIA), a new perturbation-based XAI method. These methods consist of feature insertion, deletion, and combination techniques to enhance computational efficiency and class-specific explanations in time-series classification tasks. We conduct extensive experiments in the generated synthetic dataset and various UCR Time-Series datasets to first compare the explanation performance of FIA and other existing perturbation-based XAI methods in both time-domain and time-frequency domain, and then show the superiority of our FIA in the time-frequency domain with the SpectralX framework. Finally, we conduct a user study to confirm the practicality of our FIA in SpectralX framework for class-specific time-frequency based time-series explanations. The source code is available in https://github.com/gustmd0121/Time_is_not_Enough

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