Poster
Iterative Methods via Locally Evolving Set Process
Baojian Zhou · Yifan Sun · Reza Babanezhad Harikandeh · Xingzhi Guo · Deqing Yang · Yanghua Xiao
West Ballroom A-D #7308
Abstract:
Given the damping factor and precision tolerance , \citet{andersen2006local} introduced Approximate Personalized PageRank (APPR), the \textit{de facto local method} for approximating the PPR vector, with runtime bounded by independent of the graph size. Recently, Fountoulakis \& Yang asked whether faster local algorithms could be developed using operations. By noticing that APPR is a local variant of Gauss-Seidel, this paper explores the question of *whether standard iterative solvers can be effectively localized*. We propose to use the *locally evolving set process*, a novel framework to characterize the algorithm locality, and demonstrate that many standard solvers can be effectively localized. Let and be the running average of volume and the residual ratio of active nodes during the process. We show and prove APPR admits a new runtime bound mirroring the actual performance. Furthermore, when the geometric mean of residual reduction is , then there exists such that the local Chebyshev method has runtime without the monotonicity assumption. Numerical results confirm the efficiency of this novel framework and show up to a hundredfold speedup over corresponding standard solvers on real-world graphs.
Chat is not available.