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arXiv 1912.02493stat.MLcs.LGmath.OC
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有序贝叶斯优化

Ordinal Bayesian Optimisation

Victor Picheny, Sattar Vakili, Artem Artemev

摘要:

贝叶斯优化是一个强大的工具,以解决昂贵的黑箱问题,但失败时,对目标函数的静态假设是强烈违反,这是特别是病态或不连续的目标的情况。我们解决这个问题,提出了一个新的贝叶斯优化框架,只考虑变量的顺序,在输入和输出空间,以适应一个高斯过程的潜在空间。通过这样做,我们的方法对原始空间上的原始度量是不可知的。我们提出了两种算法,分别基于乐观策略和汤普森采样。对于乐观策略,我们证明了一个最优性能下的后悔措施的潜在空间。我们说明了我们的框架上的几个具有挑战性的玩具问题的能力。

英文摘要:

Bayesian optimisation is a powerful tool to solve expensive black-box problems, but fails when the stationary assumption made on the objective function is strongly violated, which is the case in particular for ill-conditioned or discontinuous objectives. We tackle this problem by proposing a new Bayesian optimisation framework that only considers the ordering of variables, both in the input and output spaces, to fit a Gaussian process in a latent space. By doing so, our approach is agnostic to the original metrics on the original spaces. We propose two algorithms, respectively based on an optimistic strategy and on Thompson sampling. For the optimistic strategy we prove an optimal performance under the measure of regret in the latent space. We illustrate the capability of our framework on several challenging toy problems.

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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