Memory-Query Tradeoffs for Randomized Convex Optimization

Memory-Query Tradeoffs for Randomized Convex Optimization
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DOI:
10.1109/focs57990.2023.00086
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发表时间:
2023-06
期刊:
2023 IEEE 64th Annual Symposium on Foundations of Computer Science (FOCS)
影响因子:
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通讯作者:
X. Chen;Binghui Peng
X. Chen;Binghui Peng
中科院分区:
其他
文献类型:
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作者:
X. Chen;Binghui Peng

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我们证明了,任何随机一阶算法,最小化一个d维,1-Lipschitz凸函数的单位球必须使用$\Omega\left(d^{2-\delta}\right)$位的内存或$\Omega\left(d^{1+\delta / 6-o(1)}\right)$查询,对于任何常数$\delta \in(0,1)$和精度$\delta $是准多项式小的d。我们的结果表明,切割平面方法,使用$\tilde{O}\left(d^{2}\right)$位的内存和$\tilde{O}(d)$查询,是帕累托最优的随机一阶算法,和二次内存需要达到最佳的查询复杂度凸优化。
We show that any randomized first-order algorithm which minimizes a d-dimensional, 1-Lipschitz convex function over the unit ball must either use $\Omega\left(d^{2-\delta}\right)$ bits of memory or make $\Omega\left(d^{1+\delta / 6-o(1)}\right)$ queries, for any constant $\delta \in(0,1)$ and when the precision $\epsilon$ is quasipolynomially small in d. Our result implies that cutting plane methods, which use $\tilde{O}\left(d^{2}\right)$ bits of memory and $\tilde{O}(d)$ queries, are Pareto-optimal among randomized first-order algorithms, and quadratic memory is required to achieve optimal query complexity for convex optimization.