arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.0871stat.CO
收藏

计算机实验中稀有事件概率的界定

Bounding rare event probabilities in computer experiments

Yves Auffray, Pierre Barbillon, Jean-Michel Marin

摘要:

我们感兴趣的是在计算机实验的背景下,罕见事件的概率。这些罕见事件依赖于具有随机输入变量的物理模型的输出。由于该模型只能通过昂贵的黑盒函数知道,因此不能使用为罕见事件设计的标准有效的蒙特卡罗方法。然后,我们提出了一个策略来处理这个困难的基础上重要性抽样方法。该建议依赖于克里格元建模,并能够实现罕见事件概率的置信上限。由于克里格元建模步骤的可变性是适当考虑。所提出的方法被应用到一个玩具的例子,并比较更标准的贝叶斯界限。最后,分析了一个具有挑战性的真实案例研究。它包括找到一个概率的上限,空中载荷的轨迹将与飞机碰撞,已经释放它。

英文摘要:

We are interested in bounding probabilities of rare events in the context of computer experiments. These rare events depend on the output of a physical model with random input variables. Since the model is only known through an expensive black box function, standard efficient Monte Carlo methods designed for rare events cannot be used. We then propose a strategy to deal with this difficulty based on importance sampling methods. This proposal relies on Kriging metamodeling and is able to achieve sharp upper confidence bounds on the rare event probabilities. The variability due to the Kriging metamodeling step is properly taken into account. The proposed methodology is applied to a toy example and compared to more standard Bayesian bounds. Finally, a challenging real case study is analyzed. It consists of finding an upper bound of the probability that the trajectory of an airborne load will collide with the aircraft that has released it.

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。

↑