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cs.DC updates on arXiv.org

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Improved Lower Bounds for Submodular Function Minimization
Deeparnab Chakrabarty, Andrei Graur, Haotian Jiang, Aaron Sidfor · 2022-07-10 · via cs.DC updates on arXiv.org

We provide a generic technique for constructing families of submodular functions to obtain lower bounds for submodular function minimization (SFM). Applying this technique, we prove that any deterministic SFM algorithm on a ground set of $n$ elements requires at least $Ω(n \log n)$ queries to an evaluation oracle. This is the first super-linear query complexity lower bound for SFM and improves upon the previous best lower bound of $2n$ given by [Graur et al., ITCS 2020]. Using our construction, we also prove that any (possibly randomized) parallel SFM algorithm, which can make up to $\mathsf{poly}(n)$ queries per round, requires at least $Ω(n / \log n)$ rounds to minimize a submodular function. This improves upon the previous best lower bound of $\tildeΩ(n^{1/3})$ rounds due to [Chakrabarty et al., FOCS 2021], and settles the parallel complexity of query-efficient SFM up to logarithmic factors due to a recent advance in [Jiang, SODA 2021].