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arXiv 2509.16822cs.CV

照镜子:一种用于解释深度图像分类模型的忠实反事实解释方法

Looking in the mirror: A faithful counterfactual explanation method for interpreting deep image classification models

Australian Institute for Machine Learning, University of Adelaide, Australia(澳大利亚机器学习研究所,阿德莱德大学,澳大利亚);Deakin University, Australia(德肯大学,澳大利亚);Flinders University, Australia(弗林德斯大学,澳大利亚)

Townim Faisal Chowdhury, Vu Minh Hieu Phan, Kewen Liao, Nanyu Dong, Minh-Son To, Anton Hengel, Johan Verjans, Zhibin Liao

AI总结:

本文提出Mirror-CFE方法,直接在分类器特征空间中将决策边界视为镜子生成反事实解释,在保持输入相似性的同时提升有效性,并实现决策过程的可解释可视化。

摘要:

深度图像分类器的反事实解释(CFE)旨在揭示最小的输入变化如何导致不同的模型决策,为模型解释和改进提供关键见解。然而,现有的CFE方法通常依赖额外的图像编码器和生成模型来生成逼真的图像,忽略了分类器自身的特征空间和决策边界。因此,它们无法解释分类器学习到的内在特征空间和决策边界。为了解决这一局限性,我们提出了Mirror-CFE,这是一种新颖的方法,通过直接在分类器的特征空间中操作来生成忠实的反事实解释,将决策边界视为“反射”特征表示的镜子。Mirror-CFE学习一个从特征空间到图像空间的映射函数,同时保持距离关系,从而实现源图像与其反事实之间的平滑过渡。通过在四个图像数据集上的大量实验,我们证明Mirror-CFE在有效性方面取得了优越的性能,同时与最先进的解释方法相比保持了输入相似性。最后,Mirror-CFE通过生成逐步过渡来提供分类器决策过程的可解释可视化,揭示特征如何随着分类置信度的变化而演变。

英文摘要:

Counterfactual explanations (CFE) for deep image classifiers aim to reveal how minimal input changes lead to different model decisions, providing critical insights for model interpretation and improvement. However, existing CFE methods often rely on additional image encoders and generative models to create plausible images, neglecting the classifier's own feature space and decision boundaries. As such, they do not explain the intrinsic feature space and decision boundaries learned by the classifier. To address this limitation, we propose Mirror-CFE, a novel method that generates faithful counterfactual explanations by operating directly in the classifier's feature space, treating decision boundaries as mirrors that ``reflect'' feature representations in the mirror. Mirror-CFE learns a mapping function from feature space to image space while preserving distance relationships, enabling smooth transitions between source images and their counterfactuals. Through extensive experiments on four image datasets, we demonstrate that Mirror-CFE achieves superior performance in validity while maintaining input resemblance compared to state-of-the-art explanation methods. Finally, mirror-CFE provides interpretable visualization of the classifier's decision process by generating step-wise transitions that reveal how features evolve as classification confidence changes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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