arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.0837astro-ph.COstat.CO
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利用自适应重要抽样估计宇宙学参数

Estimation of cosmological parameters using adaptive importance sampling

Darren Wraith, Martin Kilbinger, Karim Benabed, Olivier Cappé, Jean-François Cardoso, Gersende Fort, Simon Prunet, Christian P. Robert

摘要:

我们提出了一种贝叶斯抽样算法,称为自适应重要性抽样或人口蒙特卡罗(PMC),其计算工作量很容易并行化,因此有可能大大减少采样所需的挂钟时间,以及提供其他好处。为了评估宇宙学问题的方法的性能,我们使用模拟和实际数据组成的CMB各向异性,Ia型超新星,和弱宇宙透镜,并提供了一个比较的结果,使用国家的最先进的马尔可夫链蒙特卡罗(MCMC)。对于这两种类型的数据集,我们发现可比的参数估计PMC和MCMC,与PMC的计算时间显着降低的优势。例如,在WMAP 5数据的情况下,挂钟时间从MCMC的几天减少到处理器集群上使用PMC的几个小时。PMC方法的其他好处,以及使用该方法的潜在困难,进行了分析和讨论。

英文摘要:

We present a Bayesian sampling algorithm called adaptive importance sampling or Population Monte Carlo (PMC), whose computational workload is easily parallelizable and thus has the potential to considerably reduce the wall-clock time required for sampling, along with providing other benefits. To assess the performance of the approach for cosmological problems, we use simulated and actual data consisting of CMB anisotropies, supernovae of type Ia, and weak cosmological lensing, and provide a comparison of results to those obtained using state-of-the-art Markov Chain Monte Carlo (MCMC). For both types of data sets, we find comparable parameter estimates for PMC and MCMC, with the advantage of a significantly lower computational time for PMC. In the case of WMAP5 data, for example, the wall-clock time reduces from several days for MCMC to a few hours using PMC on a cluster of processors. Other benefits of the PMC approach, along with potential difficulties in using the approach, are analysed and discussed.

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