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Private non-monotone submodular maximization

Author

Listed:
  • Xin Sun

    (Beijing Institute for Scientific and Engineering Computing, Beijing University of Technology)

  • Gaidi Li

    (Beijing Institute for Scientific and Engineering Computing, Beijing University of Technology)

  • Yapu Zhang

    (Beijing Institute for Scientific and Engineering Computing, Beijing University of Technology)

  • Zhenning Zhang

    (Beijing Institute for Scientific and Engineering Computing, Beijing University of Technology)

Abstract

We propose a private algorithm for the problem of maximizing a submodular but not necessary monotone set function over a down-closed family of sets. The constraint is very general since it includes some important and typical constraints such as knapsack and matroid constraints. Our algorithm Differentially Private Measure Continuous Greedy is proved to be $${\mathcal {O}}(\epsilon )$$ O ( ϵ ) -differential private. For the multilinear relaxation of the above problem, it yields $$\left( Te^{-T}-o(1)\right) $$ T e - T - o ( 1 ) -approximation guarantee with additive error $${\mathcal {O}}\left( \frac{2\varDelta }{\epsilon n^4}\right) $$ O 2 Δ ϵ n 4 , where $$T\in [0,1]$$ T ∈ [ 0 , 1 ] is the stopping time of the algorithm, $$\varDelta $$ Δ is the defined sensitivity of the objective function, which is associated to a sensitive dataset, and n is the size of the given ground set. For a specific matroid constraint, we could obtain a discrete solution with near 1/e-approximation guarantee and same additive error by lossless rounding technique. Besides, our algorithm can be also applied in monotone case. The approximation guarantee is $$\left( 1-e^{-T}-o(1)\right) $$ 1 - e - T - o ( 1 ) when the submodular set function is monotone. Furthermore, we give a conclusion in terms of the density of the relaxation constraint, which is always at least as good as the tight bound $$(1-1/e)$$ ( 1 - 1 / e ) .

Suggested Citation

  • Xin Sun & Gaidi Li & Yapu Zhang & Zhenning Zhang, 2022. "Private non-monotone submodular maximization," Journal of Combinatorial Optimization, Springer, vol. 44(5), pages 3212-3232, December.
  • Handle: RePEc:spr:jcomop:v:44:y:2022:i:5:d:10.1007_s10878-022-00875-w
    DOI: 10.1007/s10878-022-00875-w
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    References listed on IDEAS

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    1. G. L. Nemhauser & L. A. Wolsey, 1978. "Best Algorithms for Approximating the Maximum of a Submodular Set Function," Mathematics of Operations Research, INFORMS, vol. 3(3), pages 177-188, August.
    2. Nemhauser, G.L. & Wolsey, L.A., 1978. "Best algorithms for approximating the maximum of a submodular set function," LIDAM Reprints CORE 343, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
    3. Fisher, M.L. & Nemhauser, G.L. & Wolsey, L.A., 1978. "An analysis of approximations for maximizing submodular set functions," LIDAM Reprints CORE 341, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
    4. Fisher, M.L. & Nemhauser, G.L. & Wolsey, L.A., 1978. "An analysis of approximations for maximizing submodular set functions - 1," LIDAM Reprints CORE 334, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
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