arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1810.09899stat.MLcs.LGstat.COstat.ME
收藏

基于比率估计的动态无似然推理(DIRE)

Dynamic Likelihood-free Inference via Ratio Estimation (DIRE)

University of Edinburgh(爱丁堡大学)

Traiko Dinev, Michael U. Gutmann

摘要:

根据随机数据生成过程隐式定义的参数统计模型用于广泛的科学学科中,因为它们能够进行准确的建模。然而,从观测数据学习参数通常是非常困难的,因为它们的似然函数通常是难以处理的。无似然贝叶斯推断方法已经被提出,其中包括近似贝叶斯计算(ABC),合成似然,其最近的推广,执行无似然推理比估计(LFIRE)的框架。所有这些方法的一个主要困难是选择汇总统计量,减少数据的维数,以便于推断。虽然已经提出了几种方法来选择汇总统计ABC,文献合成似然和LFIRE是非常薄的日期。我们在这里解决这个差距在文献中,专注于重要的特殊情况下的时间序列模型。我们表明,卷积神经网络训练预测输入参数的数据提供合适的汇总统计LFIRE。在广泛的时间序列模型,一个单一的神经网络架构产生同样或更准确的后验比其他方法。

英文摘要:

Parametric statistical models that are implicitly defined in terms of a stochastic data generating process are used in a wide range of scientific disciplines because they enable accurate modeling. However, learning the parameters from observed data is generally very difficult because their likelihood function is typically intractable. Likelihood-free Bayesian inference methods have been proposed which include the frameworks of approximate Bayesian computation (ABC), synthetic likelihood, and its recent generalization that performs likelihood-free inference by ratio estimation (LFIRE). A major difficulty in all these methods is choosing summary statistics that reduce the dimensionality of the data to facilitate inference. While several methods for choosing summary statistics have been proposed for ABC, the literature for synthetic likelihood and LFIRE is very thin to date. We here address this gap in the literature, focusing on the important special case of time-series models. We show that convolutional neural networks trained to predict the input parameters from the data provide suitable summary statistics for LFIRE. On a wide range of time-series models, a single neural network architecture produced equally or more accurate posteriors than alternative 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。

↑