Concept-Based Explainable Artificial Intelligence: Metrics and Benchmarks

• URL: http://arxiv.org/abs/2501.19271v1
• Date: Fri, 31 Jan 2025 16:32:36 GMT
• Title: Concept-Based Explainable Artificial Intelligence: Metrics and Benchmarks
• Authors: Halil Ibrahim Aysel, Xiaohao Cai, Adam Prugel-Bennett,
• Abstract summary: Concept-based explanation methods aim to improve the interpretability of machine learning models.<n>We propose three metrics: the concept global importance metric, the concept existence metric, and the concept location metric.<n>We demonstrate that, in many cases, even the most important concepts determined by post-hoc CBMs are not present in input images.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Concept-based explanation methods, such as concept bottleneck models (CBMs), aim to improve the interpretability of machine learning models by linking their decisions to human-understandable concepts, under the critical assumption that such concepts can be accurately attributed to the network's feature space. However, this foundational assumption has not been rigorously validated, mainly because the field lacks standardised metrics and benchmarks to assess the existence and spatial alignment of such concepts. To address this, we propose three metrics: the concept global importance metric, the concept existence metric, and the concept location metric, including a technique for visualising concept activations, i.e., concept activation mapping. We benchmark post-hoc CBMs to illustrate their capabilities and challenges. Through qualitative and quantitative experiments, we demonstrate that, in many cases, even the most important concepts determined by post-hoc CBMs are not present in input images; moreover, when they are present, their saliency maps fail to align with the expected regions by either activating across an entire object or misidentifying relevant concept-specific regions. We analyse the root causes of these limitations, such as the natural correlation of concepts. Our findings underscore the need for more careful application of concept-based explanation techniques especially in settings where spatial interpretability is critical.

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