Concept-based Visual Counterfactual Explanations with Diffusion Models
This paper introduces C-VCE, a diffusion framework that integrates the classifier into the generative model via a concept bottleneck layer, eliminating the need for external noise-robust classifiers. C-VCE allows users to toggle semantic concepts during sampling, generating minimal edits while preserving the rest of the image. It includes a probabilistic regularizer to balance prediction change and similarity to the original, plus a gradient-based mask to confine modifications. On CelebA, C-VCE achieves comparable or better flip rates with visually closer and less distorted counterfactuals.
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[Submitted on 5 May 2026]
Title:Concept-based Visual Counterfactual Explanations with Diffusion Models
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Abstract:Visual counterfactual explanations aim to answer "what minimal change to this image would flip the model's prediction?", and are increasingly important as vision models are deployed in safety-critical domains (e.g., medicine). Existing diffusion-based methods can produce realistic edits, but they rely on external classifiers that must work reliably on noisy images, which makes them fragile and hard to deploy for robust explanations. We introduce C-VCE, a new diffusion framework that builds the classifier directly into the generative model via a concept bottleneck layer, so that counterfactuals are guided by human-interpretable features (concepts) instead of a separate noise robust classifier that works with pixel-level edits. Our model lets users to toggle on/off semantic concepts during sampling, then minimally adjusts relevant image regions, while preserving the rest of the image, respecting feature correlations. To keep edits small and controlled, we add a simple probabilistic regularizer that balances "change the prediction" against "stay close to the original", plus a gradient-based mask that confines modifications to the most relevant regions. On benchmarks such as CelebA, C-VCE matches or improves flip rates while producing counterfactuals that are visually closer to the input and less distorted than baselines that depend on separate noisy-image classifiers. These properties make C-VCE a practical tool for vision systems where users need concrete "what-if" images without having to trust an additional, noise-robust classifier. More broadly, our results suggest that exposing and controlling an internal concept layer is a promising way to make powerful generative models easier to understand and safer to use.
Comments: Accepted at the 4th World Conference on eXplainable Artificial Intelligence (XAI 2026)
Subjects:
Artificial Intelligence (cs.AI); Computer Vision and Pattern Recognition (cs.CV)
ACM classes: I.2.10; I.4.8; I.5.1
Cite as: arXiv:2607.22544 [cs.AI]
(or arXiv:2607.22544v1 [cs.AI] for this version)
https://doi.org/10.48550/arXiv.2607.22544
arXiv-issued DOI via DataCite
Submission history
From: Yassine Oueslati [view email] [v1] Tue, 5 May 2026 15:32:50 UTC (16,277 KB)
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