Frequentist Validity of Epistemic Uncertainty Estimators

• URL: http://arxiv.org/abs/2510.22063v1
• Date: Fri, 24 Oct 2025 22:58:42 GMT
• Title: Frequentist Validity of Epistemic Uncertainty Estimators
• Abstract summary: We introduce a frequentist measure of uncertainty based on the bootstrap.<n>Our main theoretical contribution is a novel expansion that reveals that our proposed measure and the (Bayesian) mutual information are theally equivalent.<n>This provides frequentist interpretations to mutual information and new computational strategies for approximating it.
• Score: 9.204324119167692
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Decomposing prediction uncertainty into its aleatoric (irreducible) and epistemic (reducible) components is critical for the development and deployment of machine learning systems. A popular, principled measure for epistemic uncertainty is the mutual information between the response variable and model parameters. However, evaluating this measure requires access to the posterior distribution of the model parameters, which is challenging to compute. In view of this, we introduce a frequentist measure of epistemic uncertainty based on the bootstrap. Our main theoretical contribution is a novel asymptotic expansion that reveals that our proposed (frequentist) measure and the (Bayesian) mutual information are asymptotically equivalent. This provides frequentist interpretations to mutual information and new computational strategies for approximating it. Moreover, we link our proposed approach to the widely-used heuristic approach of deep ensembles, giving added perspective on their practical success.

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