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• W2956227617 abstract "Submodular functions are set functions mapping every subset of some ground set of size $n$ into the real numbers and satisfying the diminishing returns property. Submodular minimization is an important field in discrete optimization theory due to its relevance for various branches of mathematics, computer science and economics. The currently fastest strongly polynomial algorithm for exact minimization [LSW15] runs in time $widetilde{O}(n^3 cdot mathrm{EO} + n^4)$ where $mathrm{EO}$ denotes the cost to evaluate the function on any set. For functions with range $[-1,1]$, the best $epsilon$-additive approximation algorithm [CLSW17] runs in time $widetilde{O}(n^{5/3}/epsilon^{2} cdot mathrm{EO})$. In this paper we present a classical and a quantum algorithm for approximate submodular minimization. Our classical result improves on the algorithm of [CLSW17] and runs in time $widetilde{O}(n^{3/2}/epsilon^2 cdot mathrm{EO})$. Our quantum algorithm is, up to our knowledge, the first attempt to use quantum computing for submodular optimization. The algorithm runs in time $widetilde{O}(n^{5/4}/epsilon^{5/2} cdot log(1/epsilon) cdot mathrm{EO})$. The main ingredient of the quantum result is a new method for sampling with high probability $T$ independent elements from any discrete probability distribution of support size $n$ in time $O(sqrt{Tn})$. Previous quantum algorithms for this problem were of complexity $O(Tsqrt{n})$." @default.
• W2956227617 created "2019-07-23" @default.
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• W2956227617 date "2019-11-06" @default.
• W2956227617 modified "2023-09-30" @default.
• W2956227617 title "Quantum and Classical Algorithms for Approximate Submodular Function Minimization" @default.
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