Title:Regenerative Ulam-von Neumann Algorithm: An Innovative Markov chain Monte Carlo Method for Matrix Inversion

Abstract:This paper presents an extension of the classical Ulan-von Neumann Markov chain Monte-Carlo algorithm for the computation of the matrix inverse. The algorithm presented in this paper, termed as \emph{regenerative Ulam-von Neumann algorithm}, utilizes the regenerative structure of classical, non-truncated Neumann series defined by a non-singular matrix and produces an unbiased estimator of the matrix inverse. Furthermore, the accuracy of the proposed algorithm depends on a single parameter that controls the total number of Markov transitions simulated thus avoiding the challenge of balancing between the total number of Markov chain replications and its corresponding length as in the classical Ulam-von Neumann algorithm. To efficiently utilize the Markov chain transition samples in the calculation of the regenerative quantities, the proposed algorithm quantifies automatically the contribution of each Markov transition to all regenerative quantities by a carefully designed updating scheme that utilized three separate matrices containing the current weights, total weights, and regenerative cycle count, respectively. A probabilistic analysis of the performance of the algorithm, including the variance of the estimator, is provided. Finally, numerical experiments verify the qualitative effectiveness of the proposed scheme.