GLOBE-CE: A Translation-Based Approach for Global Counterfactual Explanations
Counterfactual explanations (CEs) have been widely studied in explainability, though the major shortcoming associated with these methods, is their inability to provide explanations beyond the instance-level. While many works touch upon the notion of a global explanation, typically suggesting to aggregate masses of local explanations, few provide frameworks that are both reliable and computationally tractable. We take this opportunity to propose Global & Efficient Counterfactual Explanations (GLOBE-CE), a flexible framework that tackles the reliability and scalability issues associated with current state-of-the-art, particularly on higher dimensional datasets and in the presence of continuous features. Our framework permits GCEs to have variable magnitudes while preserving a fixed translation direction, to mitigate the commonly accepted trade-off between coverage and cost. Furthermore, we provide a unique mathematical analysis of categorical feature translations, utilising it in our method. Experimental evaluation demonstrates improved performance across multiple metrics (e.g., speed, reliability).
Published as a conference paper at ICML 2023.