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arXiv 2203.01459cs.LGstat.ML
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基于高斯过程Vecchia近似的可扩展贝叶斯优化

Scalable Bayesian Optimization Using Vecchia Approximations of Gaussian Processes

Texas A&M University(德州农工大学)

Felix Jimenez, Matthias Katzfuss

摘要:

贝叶斯优化是一种优化黑盒目标函数的技术。贝叶斯优化的核心是一个代理模型,它预测目标函数在以前看不见的输入下的输出,以便于选择有希望的输入值。高斯过程(GP)通常用作代理模型,但已知其与观测数量的比例关系很差。我们适应Vecchia近似,一个流行的GP近似空间统计,使可扩展的高维贝叶斯优化。我们开发了几个改进和扩展,包括训练翘曲的GP使用小批量梯度下降,近似邻居搜索,并选择多个输入值并行。我们专注于使用我们的翘曲Vecchia GP在信任区域贝叶斯优化通过汤普森采样。在几个测试函数和两个并行学习问题上,我们的方法与最先进的方法相比毫不逊色。

英文摘要:

Bayesian optimization is a technique for optimizing black-box target functions. At the core of Bayesian optimization is a surrogate model that predicts the output of the target function at previously unseen inputs to facilitate the selection of promising input values. Gaussian processes (GPs) are commonly used as surrogate models but are known to scale poorly with the number of observations. We adapt the Vecchia approximation, a popular GP approximation from spatial statistics, to enable scalable high-dimensional Bayesian optimization. We develop several improvements and extensions, including training warped GPs using mini-batch gradient descent, approximate neighbor search, and selecting multiple input values in parallel. We focus on the use of our warped Vecchia GP in trust-region Bayesian optimization via Thompson sampling. On several test functions and on two reinforcement-learning problems, our methods compared favorably to the state of the art.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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