Natural Posterior Network: Deep Bayesian Predictive Uncertainty for Exponential Family DistributionsDownload PDF

29 Sept 2021, 00:31 (edited 16 Mar 2022)ICLR 2022 SpotlightReaders: Everyone
  • Keywords: Uncertainty, Exponential Family, Bayesian Update, Conjugate Prior
  • Abstract: Uncertainty awareness is crucial to develop reliable machine learning models. In this work, we propose the Natural Posterior Network (NatPN) for fast and high-quality uncertainty estimation for any task where the target distribution belongs to the exponential family. Thus, NatPN finds application for both classification and general regression settings. Unlike many previous approaches, NatPN does not require out-of-distribution (OOD) data at training time. Instead, it leverages Normalizing Flows to fit a single density on a learned low-dimensional and task-dependent latent space. For any input sample, NatPN uses the predicted likelihood to perform a Bayesian update over the target distribution. Theoretically, NatPN assigns high uncertainty far away from training data. Empirically, our extensive experiments on calibration and OOD detection show that NatPN delivers highly competitive performance for classification, regression and count prediction tasks.
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