Smoothed Analysis with Adaptive Adversaries
Smoothed Analysis with Adaptive Adversaries
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使用自适应对手进行平滑分析
DOI:
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发表时间:
2021
期刊:
影响因子:
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通讯作者:
Abhishek Shetty
中科院分区:
文献类型:
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作者:
Nika Haghtalab;Tim Roughgarden;Abhishek Shetty
We prove novel algorithmic guarantees for several online problems in the smoothed analysis model. In this model, at each time step an adversary chooses an input distribution with density function bounded above pointwise by a multiplicative factor from the uniform distribution; nature then samples an input from this distribution. This interpolates between the extremes of worst-case and average case analysis. Crucially, our results hold for adaptive adversaries that can base their choice of an input distribution on the decisions of the algorithm and the realizations of the inputs in the previous time steps. An adaptive adversary can nontrivially correlate inputs at different time steps with each other and with the algorithm's current state; this appears to rule out the standard proof approaches in smoothed analysis. This paper presents a general technique for proving smoothed algorithmic guarantees against adaptive adversaries, in effect reducing the setting of an adaptive adversary to the much simpler case of an oblivious adversary (i.e., an adversary that commits in advance to the entire sequence of input distributions). We apply this technique to prove strong smoothed guarantees for three different problems: Online learning, Online discrepancy and Dispersion in online optimization. We show that in these setting, we can get bounds that match bounds we can get for non-adaptive adversaries.
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DOI:
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发表时间:
2017-03
期刊:
ArXiv
影响因子:
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作者:
Pranjal Awasthi;Avrim Blum;Nika Haghtalab;Y. Mansour
通讯作者:
Pranjal Awasthi;Avrim Blum;Nika Haghtalab;Y. Mansour
DOI:
10.1109/focs.2019.00043
发表时间:
2019
期刊:
2019 IEEE 60th Annual Symposium on Foundations of Computer Science (FOCS
影响因子:
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作者:
Bhaskara, Aditya;Chen, Aidao;Perreault, Aidan;Vijayaraghavan, Aravindan
通讯作者:
Vijayaraghavan, Aravindan
DOI:
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发表时间:
2020
期刊:
Advances in neural information processing systems
影响因子:
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作者:
Haghtalab, Nika;Roughgarden, Tim;Shetty, Abhishek
通讯作者:
Shetty, Abhishek
DOI:
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发表时间:
2017-12
期刊:
ArXiv
影响因子:
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作者:
Aravindan Vijayaraghavan;Abhratanu Dutta;Alex L. Wang
通讯作者:
Aravindan Vijayaraghavan;Abhratanu Dutta;Alex L. Wang