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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
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[ Paper [ Poster [ OpenReview
Wed 11 Dec 11 a.m. PST — 2 p.m. PST

Abstract: Given the damping factor α and precision tolerance ϵ, \citet{andersen2006local} introduced Approximate Personalized PageRank (APPR), the \textit{de facto local method} for approximating the PPR vector, with runtime bounded by Θ(1/(αϵ)) independent of the graph size. Recently, Fountoulakis \& Yang asked whether faster local algorithms could be developed using O~(1/(αϵ)) 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 vol¯(St) and γt¯ be the running average of volume and the residual ratio of active nodes St during the process. We show vol¯(St)/γt¯1/ϵ and prove APPR admits a new runtime bound O~(vol¯(St)/(αγt¯)) mirroring the actual performance. Furthermore, when the geometric mean of residual reduction is Θ(α), then there exists c(0,2) such that the local Chebyshev method has runtime O~(vol¯(St)/(α(2c))) 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.

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