Hierarchical Semantic Tree Concept Whitening for Interpretable Image Classification

• URL: http://arxiv.org/abs/2307.04343v1
• Date: Mon, 10 Jul 2023 04:54:05 GMT
• Title: Hierarchical Semantic Tree Concept Whitening for Interpretable Image Classification
• Authors: Haixing Dai, Lu Zhang, Lin Zhao, Zihao Wu, Zhengliang Liu, David Liu, Xiaowei Yu, Yanjun Lyu, Changying Li, Ninghao Liu, Tianming Liu, Dajiang Zhu
• Abstract summary: Post-hoc analysis can only discover the patterns or rules that naturally exist in models. We proactively instill knowledge to alter the representation of human-understandable concepts in hidden layers. Our method improves model interpretability, showing better disentanglement of semantic concepts, without negatively affecting model classification performance.
• Score: 19.306487616731765
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: With the popularity of deep neural networks (DNNs), model interpretability is becoming a critical concern. Many approaches have been developed to tackle the problem through post-hoc analysis, such as explaining how predictions are made or understanding the meaning of neurons in middle layers. Nevertheless, these methods can only discover the patterns or rules that naturally exist in models. In this work, rather than relying on post-hoc schemes, we proactively instill knowledge to alter the representation of human-understandable concepts in hidden layers. Specifically, we use a hierarchical tree of semantic concepts to store the knowledge, which is leveraged to regularize the representations of image data instances while training deep models. The axes of the latent space are aligned with the semantic concepts, where the hierarchical relations between concepts are also preserved. Experiments on real-world image datasets show that our method improves model interpretability, showing better disentanglement of semantic concepts, without negatively affecting model classification performance.

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