arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1501.02467stat.MEstat.APstat.ML
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天文观测的快速最优非参数序贯设计

Fast and optimal nonparametric sequential design for astronomical observations

Justin J. Yang, Xufei Wang, Pavlos Protopapas, Luke Bornn

摘要:

光谱能量分布(SED)是天文学家区分不同天体(如星系、黑洞和恒星)的一种相对简单的方法。通过将来自不同频率源的观测与模板模型进行比较,天文学家能够推断出该观测对象的类型。在本文中,我们采取贝叶斯模型平均的角度来学习天文对象,采用贝叶斯非参数方法来适应已知的log-SED凸组合的偏差。为了有效地利用望远镜观测时间,我们研究了无共轭的贝叶斯非参数序贯试验设计,其中我们使用序贯蒙特卡罗作为一种有效的工具,以最大限度地提高存储在后验分布的信息量的兴趣参数。还提出了一种新的技术进行推断的对数高斯考克斯过程称为泊松对数正态近似。仿真结果表明,我们的方法的速度,准确性和实用性。虽然我们在本文中提出的战略是全新的天文学文献,推理技术适用于更一般的非参数序贯试验设计问题。

英文摘要:

The spectral energy distribution (SED) is a relatively easy way for astronomers to distinguish between different astronomical objects such as galaxies, black holes, and stellar objects. By comparing the observations from a source at different frequencies with template models, astronomers are able to infer the type of this observed object. In this paper, we take a Bayesian model averaging perspective to learn astronomical objects, employing a Bayesian nonparametric approach to accommodate the deviation from convex combinations of known log-SEDs. To effectively use telescope time for observations, we then study Bayesian nonparametric sequential experimental design without conjugacy, in which we use sequential Monte Carlo as an efficient tool to maximize the volume of information stored in the posterior distribution of the parameters of interest. A new technique for performing inferences in log-Gaussian Cox processes called the Poisson log-normal approximation is also proposed. Simulations show the speed, accuracy, and usefulness of our method. While the strategy we propose in this paper is brand new in the astronomy literature, the inferential techniques developed apply to more general nonparametric sequential experimental design 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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