Impact of Representation Learning in Linear Bandits
Impact of Representation Learning in Linear Bandits
复制标题
表征学习对线性强盗的影响
DOI:
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发表时间:
2020
期刊:
影响因子:
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通讯作者:
S. Du
中科院分区:
文献类型:
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作者:
Jiaqi Yang;Wei Hu;Jason D. Lee;S. Du
We study how representation learning can improve the efficiency of bandit problems. We study the setting where we play $T$ linear bandits with dimension $d$ concurrently, and these $T$ bandit tasks share a common $k (ll d)$ dimensional linear representation. For the finite-action setting, we present a new algorithm which achieves $widetilde{O}(Tsqrt{kN} + sqrt{dkNT})$ regret, where $N$ is the number of rounds we play for each bandit. When $T$ is sufficiently large, our algorithm significantly outperforms the naive algorithm (playing $T$ bandits independently) that achieves $widetilde{O}(Tsqrt{d N})$ regret. We also provide an $Omega(Tsqrt{kN} + sqrt{dkNT})$ regret lower bound, showing that our algorithm is minimax-optimal up to poly-logarithmic factors. Furthermore, we extend our algorithm to the infinite-action setting and obtain a corresponding regret bound which demonstrates the benefit of representation learning in certain regimes. We also present experiments on synthetic and real-world data to illustrate our theoretical findings and demonstrate the effectiveness of our proposed algorithms.
DOI:
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发表时间:
2019-06
期刊:
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影响因子:
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作者:
M. Khodak;Maria-Florina Balcan;Ameet Talwalkar
通讯作者:
M. Khodak;Maria-Florina Balcan;Ameet Talwalkar
DOI:
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发表时间:
2021
期刊:
Proceedings of The 24th International Conference on Artificial Intelligence and Statistics
影响因子:
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作者:
Li, Yingkai;Wang, Yining;Chen, Xi;Zhou, Yuan
通讯作者:
Zhou, Yuan
DOI:
10.1145/3406325.3451004
发表时间:
2021
期刊:
STOC 2021: Proceedings of the 53rd Annual ACM SIGACT Symposium on Theory of Computing
影响因子:
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作者:
Ruan, Yufei;Yang, Jiaqi;Zhou, Yuan
通讯作者:
Zhou, Yuan