When can a posterior predictive check identify the learning rate? Exact degeneracy in Gaussian models and implications for Generalised Bayesian Inerence

Nam Anh Le

Generalised Bayesian inference tempers the likelihood by a learning rate $\hat{I}\cdot$ to mitigate model misspecification, and the choice of $\hat{I}\cdot$ is consequential. Zafar and Nicholls (2024)…