The complexity of gradient descent: CLS = PPAD ∩ PLS

The complexity of gradient descent: CLS = PPAD ∩ PLS
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梯度下降的复杂度:CLS = PPAD ∩ PLS

DOI:
10.1145/3406325.3451052
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发表时间:
2020
期刊:
Proceedings of the 53rd Annual ACM SIGACT Symposium on Theory of Computing
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--
通讯作者:
Rahul Savani
Rahul Savani
中科院分区:
--
文献类型:
--
作者:
John Fearnley;P. Goldberg;Alexandros Hollender;Rahul Savani

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我们研究可以通过在有界凸的多面体域上执行梯度下降来解决的搜索问题,并表明该类别等于两个众所周知的类别的相互作用:PPAD和PLS作为我们的主要基础技术贡献。在域上连续区分函数的Karush-Kuhn-tucker(KKT)点[0,1] 2是PPAD∩pls-complete。在此类中显示完整的结果。 Pls。
We study search problems that can be solved by performing Gradient Descent on a bounded convex polytopal domain and show that this class is equal to the intersection of two well-known classes: PPAD and PLS. As our main underlying technical contribution, we show that computing a Karush-Kuhn-Tucker (KKT) point of a continuously differentiable function over the domain [0,1]2 is PPAD ∩ PLS-complete. This is the first natural problem to be shown complete for this class. Our results also imply that the class CLS (Continuous Local Search) - which was defined by Daskalakis and Papadimitriou as a more “natural” counterpart to PPAD ∩ PLS and contains many interesting problems - is itself equal to PPAD ∩ PLS.
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