ExMap: Leveraging Explainability Heatmaps for Unsupervised Group Robustness to Spurious Correlations
Authors: Rwiddhi Chakraborty, Adrian Sletten, Michael C. Kampffmeyer

Group robustness strategies aim to mitigate learned biases in deep learning models that arise from spurious correlations present in their training datasets. However most existing methods rely on the access to the label distribution of the groups which is time-consuming and expensive to obtain. As a result unsupervised group robustness strategies are sought. Based on the insight that a trained model's classification strategies can be inferred accurately based on explainability heatmaps we introduce ExMap an unsupervised two stage mechanism designed to enhance group robustness in traditional classifiers. ExMap utilizes a clustering module to infer pseudo-labels based on a model's explainability heatmaps which are then used during training in lieu of actual labels. Our empirical studies validate the efficacy of ExMap - We demonstrate that it bridges the per- formance gap with its supervised counterparts and outperforms existing partially supervised and unsupervised methods. Additionally ExMap can be seamlessly integrated with existing group robustness learning strategies. Finally we demonstrate its potential in tackling the emerging issue of multiple shortcut mitigation