Meta-Learning Priors for Safe Bayesian OptimizationDownload PDF

Published: 10 Sept 2022, Last Modified: 05 May 2023CoRL 2022 OralReaders: Everyone
Keywords: Safety, Meta-Learning, Bayesian Optimization, Gaussian Processes
TL;DR: Choosing informative but safe priors for safe Bayesian optimization
Abstract: In robotics, optimizing controller parameters under safety constraints is an important challenge. Safe Bayesian optimization (BO) quantifies uncertainty in the objective and constraints to safely guide exploration in such settings. Hand-designing a suitable probabilistic model can be challenging however. In the presence of unknown safety constraints, it is crucial to choose reliable model hyper-parameters to avoid safety violations. Here, we propose a data-driven approach to this problem by em meta-learning priors for safe BO from offline data. We build on a meta-learning algorithm, F-PACOH, capable of providing reliable uncertainty quantification in settings of data scarcity. As core contribution, we develop a novel framework for choosing safety-compliant priors in a data-riven manner via empirical uncertainty metrics and a frontier search algorithm. On benchmark functions and a high-precision motion system, we demonstrate that our meta-learnt priors accelerate convergence of safe BO approaches while maintaining safety.
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