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Author:

Yang, Ruiqi (Yang, Ruiqi.) | Xu, Dachuan (Xu, Dachuan.) | Guo, Longkun (Guo, Longkun.) | Zhang, Dongmei (Zhang, Dongmei.)

Indexed by:

EI Scopus SCIE

Abstract:

In the problem of maximizing regularized two-stage submodular functions in streams, we assemble a family F of m functions each of which is submodular and is visited in a streaming style that an element is visited for only once. The aim is to choose a subset S of size at most l from the element stream V, so as to maximize the average maximum value of these functions restricted on S with a regularized modular term. The problem can be formally casted as max(S subset of V, vertical bar S vertical bar <= l) 1/m Sigma(m)(i=1) max(T subset of S, vertical bar T vertical bar) (<=) (k) [f(i)(T) - c(T)], where : V -> R+ is a non-negative modular function and f(i) : 2(V) -> R+, for all i is an element of {1, ..., m} is a non-negative mono- tone non-decreasing submodular function. The well-studied regularized problem of max(S subset of V,) (vertical bar S vertical bar <= k) f(S) - c(S) is exactly a special case of the above regularized two-stage submodular maximization by setting m = 1 and l = k. Although f(.) - c(.) is submodular, it is potentially negative and non-monotone and admits no constant multiplicative factor approximation. Therefore, we adopt a slightly weaker notion of approximation which constructs S such that f (S) - c(S) >= rho . f (O) - c(O) holds against optimum solution O for some rho is an element of (0, 1). Eventually, we devise a streaming algorithm by employing the distorted threshold technique, achieving a weaker approximation ratio with rho = 0.2996 for the discussed regularized two-stage model.

Keyword:

approximation algorithms threshold technique submodular maximization streaming model two-stage

Author Community:

  • [ 1 ] [Yang, Ruiqi]Beijing Univ Technol, Beijing Inst Sci & Engn Comp, Beijing 100124, Peoples R China
  • [ 2 ] [Xu, Dachuan]Beijing Univ Technol, Beijing Inst Sci & Engn Comp, Beijing 100124, Peoples R China
  • [ 3 ] [Yang, Ruiqi]Univ Chinese Acad Sci, Sch Math Sci, Beijing 100049, Peoples R China
  • [ 4 ] [Guo, Longkun]Qilu Univ Technol, Sch Comp Sci & Technol, Jinan 250353, Peoples R China
  • [ 5 ] [Zhang, Dongmei]Shandong Jianzhu Univ, Sch Comp Sci & Technol, Jinan 250101, Peoples R China

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Source :

SCIENCE CHINA-INFORMATION SCIENCES

ISSN: 1674-733X

Year: 2022

Issue: 4

Volume: 65

8 . 8

JCR@2022

8 . 8 0 0

JCR@2022

ESI Discipline: COMPUTER SCIENCE;

ESI HC Threshold:46

JCR Journal Grade:1

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count: 3

SCOPUS Cited Count: 4

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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