Approximate Manifold Sampling Robust Bayesian Inference for Machine Learning

用于机器学习的近似流形采样鲁棒贝叶斯推理

• 批准号: 2277956
• 金额: --
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2277956
• 关键词: Approximate; Manifold; Sampling; Robust; Bayesian

Efficient sampling from probability densities concentrated around a lower-dimensional submanifold is crucial in numerous applications arising in machine learning, statistics, and statistical physics. This task is particularly challenging due to the extreme anisotropy and high-dimensionality of the problem, and the correlation between the variables. We propose a novel family of bespoke MCMC algorithms designed to sample efficiently from these densities and show their computational superiority to general purpose and specialized samplers. Furthermore, we contribute to the development of integrator and Markov snippets, which are a particular class of general-purpose sequential algorithms for Bayesian inference and machine learning that can leverage the geometry of the space with integrators, is highly robust to the choice of the step size and the number of integration steps, and naturally lends itself to parallelisation. Building on these foundations, we present a sequential algorithm that is particularly well-suited to approximate manifold sampling.

从集中在低维子流形周围的概率密度中进行有效采样，在机器学习、统计学和统计物理等众多应用中至关重要。由于问题的极端各向异性和高维性，以及变量之间的相关性，这项任务尤其具有挑战性。我们提出了一种新的定制MCMC算法家族，旨在从这些密度中有效地采样，并显示出它们对通用和专用采样器的计算优势。此外，我们还为积分器和马尔可夫片段的开发做出了贡献，这是贝叶斯推理和机器学习的一类特殊的通用顺序算法，可以利用积分器的空间几何，对步长和积分步骤数量的选择具有高度鲁棒性，并且自然地适合并行化。在这些基础上，我们提出了一种特别适合于近似流形采样的顺序算法。