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:
影响因子:
--
通讯作者:
Rahul Savani
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文献类型:
--
作者:
John Fearnley;P. Goldberg;Alexandros Hollender;Rahul Savani
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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DOI:
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