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Robustness to corruption in pre-trained Bayesian neural networks
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We develop ShiftMatch, a new training-data-dependent likelihood for robustness to corruption in Bayesian neural networks (BNNs). ShiftMatch is inspired by the training-data-dependent "EmpCov" priors from Izmailov et al. (2021a), and efficiently matches test-time spatial correlations to those at training time. Critically, ShiftMatch is designed to leave the neural network's training time likelihood unchanged, allowing it to use publicly available samples from pre-trained BNNs. Using pre-trained HMC samples, ShiftMatch gives strong performance improvements on CIFAR-10-C, outperforms EmpCov priors (though ShiftMatch uses extra information from a minibatch of corrupted test points), and is perhaps the first Bayesian method capable of convincingly outperforming plain deep ensembles.
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Weight Averaging for Out-of-Distribution Generalization and Few-Shot Domain Adaptation
Gradient-similarity-regularized weight averaging and WA+SAM fine-tuning are tested on OOD and few-shot domain adaptation benchmarks, with mixed results that do not support the claimed improvements.
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