arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1506.06975stat.COq-fin.RMstat.ML
收藏

具有难处理似然的状态空间模型中快速近似推理的贝叶斯优化

Bayesian optimisation for fast approximate inference in state-space models with intractable likelihoods

Johan Dahlin, Mattias Villani, Thomas B. Schön

摘要:

本文研究了具有难处理似然的非线性状态空间模型的近似贝叶斯参数推断问题。具有近似贝叶斯计算的序贯蒙特卡罗(SMC-ABC)是一种用于近似这种类型的模型中的可能性的方法。然而,这种近似可能是有噪声的并且计算成本高,这阻碍了使用基于优化和蒙特卡罗方法的标准方法的有效实现。我们提出了一种计算效率高的新方法的基础上结合高斯过程优化和SMC-ABC创建一个拉普拉斯近似的棘手后。我们将所提出的算法用于随机波动率模型的推理,同时使用合成数据和真实数据,以及使用Copula模型估计两个投资组合的风险价值。我们的文件之间的一个和两个数量级的速度相比,国家的最先进的后验推理算法。

英文摘要:

We consider the problem of approximate Bayesian parameter inference in non-linear state-space models with intractable likelihoods. Sequential Monte Carlo with approximate Bayesian computations (SMC-ABC) is one approach to approximate the likelihood in this type of models. However, such approximations can be noisy and computationally costly which hinders efficient implementations using standard methods based on optimisation and Monte Carlo methods. We propose a computationally efficient novel method based on the combination of Gaussian process optimisation and SMC-ABC to create a Laplace approximation of the intractable posterior. We exemplify the proposed algorithm for inference in stochastic volatility models with both synthetic and real-world data as well as for estimating the Value-at-Risk for two portfolios using a copula model. We document speed-ups of between one and two orders of magnitude compared to state-of-the-art algorithms for posterior inference.

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。

↑