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arXiv 2107.09002astro-ph.CO
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基于深度求和的宇宙学参数估计与推断

Cosmological Parameter Estimation and Inference using Deep Summaries

Janis Fluri, Aurelien Lucchi, Tomasz Kacprzak, Alexandre Refregier, Thomas Hofmann

摘要:

获得模型参数的可靠点估计的能力在物理学的许多领域中是至关重要的。这通常是一项困难的任务,因为观察到的数据可能具有非常高的维度。为了解决这个问题,我们提出了一种新的方法来构建参数估计与可量化的偏差使用的顺序扩展的高度压缩的深度汇总统计的观察数据。这些汇总统计是使用信息最大化损失自动学习的。给定一个观察,我们进一步展示了如何使用构造的估计量来获得近似贝叶斯计算(ABC)后验估计及其相应的不确定性,即使可能性不容易处理,也可以使用高斯过程回归进行参数推断。我们验证了我们的方法与弱透镜质量映射的宇宙学参数推断问题的应用。我们表明,在这种情况下,所构造的估计是无偏的,并有一个几乎最佳的方差,而高斯过程回归得到的后验分布是接近真实的后验和执行更好或同样比可比的方法。

英文摘要:

The ability to obtain reliable point estimates of model parameters is of crucial importance in many fields of physics. This is often a difficult task given that the observed data can have a very high number of dimensions. In order to address this problem, we propose a novel approach to construct parameter estimators with a quantifiable bias using an order expansion of highly compressed deep summary statistics of the observed data. These summary statistics are learned automatically using an information maximising loss. Given an observation, we further show how one can use the constructed estimators to obtain approximate Bayes computation (ABC) posterior estimates and their corresponding uncertainties that can be used for parameter inference using Gaussian process regression even if the likelihood is not tractable. We validate our method with an application to the problem of cosmological parameter inference of weak lensing mass maps. We show in that case that the constructed estimators are unbiased and have an almost optimal variance, while the posterior distribution obtained with the Gaussian process regression is close to the true posterior and performs better or equally well than comparable methods.

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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