arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2403.07618math.PR
收藏

马尔可夫链状态空间约简的形式误差界

Formal Error Bounds for the State Space Reduction of Markov Chains

Fabian Michel, Markus Siegle

AI总结:

本文针对离散与连续时间马尔可夫链的状态空间约简问题,扩展了近似瞬态分布的形式误差界理论,对比相关概念并分析了低误差界聚合算法的初步实验,为马尔可夫链近似提供误差分析方法。

摘要:

我们研究离散时间和连续时间马尔可夫链在约简状态空间上的近似问题。在此背景下,我们扩展了现有关于近似瞬态分布的形式误差界理论。作为特例,我们考虑聚合(或分块)马尔可夫链,其状态空间约简通过将状态空间划分为宏观状态实现。在离散时间设置中,我们对误差的逐步增量进行了界定;在连续时间设置中,我们对误差的增长速率进行了界定。此外,相同的误差界还可用于界定近似平稳分布与平稳状态的偏差程度。随后,我们将这些误差界与文献中的相关概念进行比较,例如精确和普通分块性,以及可压缩性和可聚合性。这些概念定义了比必要条件更严格的条件,以识别聚合误差为零的场景。我们还考虑了寻找形式误差界较低的合适聚合的可能算法,并分析了这些算法在一系列不同模型上的初步实验。

英文摘要:

We study the approximation of a Markov chain on a reduced state space, for both discrete- and continuous-time Markov chains. In this context, we extend the existing theory of formal error bounds for the approximated transient distributions. As a special case, we consider aggregated (or lumped) Markov chains, where the state space reduction is achieved by partitioning the state space into macro states. In the discrete-time setting, we bound the stepwise increment of the error, and in the continuous-time setting, we bound the rate at which the error grows. In addition, the same error bounds can also be applied to bound how far an approximated stationary distribution is from stationarity. Subsequently, we compare these error bounds with relevant concepts from the literature, such as exact and ordinary lumpability, as well as deflatability and aggregatability. These concepts define stricter than necessary conditions to identify settings in which the aggregation error is zero. We also consider possible algorithms for finding suitable aggregations for which the formal error bounds are low, and we analyse first experiments with these algorithms on a range of different models.

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。

↑