Finding the optimal exploration-exploitation trade-off online through Bayesian risk estimation and minimization
Finding the optimal exploration-exploitation trade-off online through Bayesian risk estimation and minimization
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通过贝叶斯风险估计和最小化在线找到最佳探索-利用权衡
DOI:
10.1016/j.artint.2024.104096
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发表时间:
2024
影响因子:
14.4
通讯作者:
Girdhar, Yogesh
中科院分区:
文献类型:
--
作者:
Jamieson, Stewart;How, Jonathan P.;Girdhar, Yogesh
We proposeendogenous Bayesian risk minimization(EBRM) over policy sets as an approach to online learning across a wide range of settings. Many real-world online learning problems have complexities such as action- and belief-dependent rewards, time-discounting of reward, and heterogeneous costs for actions and feedback; we find that existing online learning heuristics cannot leverage most problem-specific information, to the detriment of their performance. We introduce a belief-space Markov decision process (BMDP) model that can capture these complexities, and further apply the concepts ofaleatoric,epistemic, andprocessrisks to online learning. These risk functions describe the risk inherent to the learning problem, the risk due to the agent's lack of knowledge, and the relative quality of its policy, respectively. We demonstrate how computing and minimizing these risk functions guides the online learning agent towards the optimal exploration-exploitation trade-off in any stochastic online learning problem, constituting the basis of the EBRM approach. We also show how Bayes' risk, the minimization objective in stochastic online learning problems, can be decomposed into the aforementioned aleatoric, epistemic, and process risks.In simulation experiments, EBRM algorithms achieve state-of-the-art performance across various classical online learning problems, including Gaussian and Bernoulli multi-armed bandits, best-arm identification, mixed objectives with action- and belief-dependent rewards, and dynamic pricing, a finite partial monitoring problem. To our knowledge, it is also the first computationally efficient online learning approach that can provide online bounds on an algorithm's Bayes' risk. Finally, because the EBRM approach is parameterized by a set of policy algorithms, it can be extended to incorporate new developments in online learning algorithms, and is thus well-suited as the foundation for developing real-world learning agents.
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影响因子:
1.7
作者:
Bartok, Gabor;Foster, Dean P.;Szepesvari, Csaba
通讯作者:
Szepesvari, Csaba
DOI:
--
发表时间:
2010
期刊:
International Conference on Conceptual Structures
影响因子:
--
作者:
I. Ryzhov;P. Frazier;Warrren B Powell
通讯作者:
Warrren B Powell
DOI:
10.1287/opre.1110.0999
发表时间:
2012
期刊:
Oper. Res.
影响因子:
--
作者:
I. Ryzhov;Warren B. Powell;Peter I. Frazier
通讯作者:
I. Ryzhov;Warren B. Powell;Peter I. Frazier
DOI:
10.1609/icaps.v29i1.3505
发表时间:
2019-01
期刊:
--
影响因子:
--
作者:
Apoorva Sharma;James Harrison;Matthew W. Tsao;M. Pavone
通讯作者:
Apoorva Sharma;James Harrison;Matthew W. Tsao;M. Pavone
影响因子:
3.1
作者:
Sarah Al;N. Dhanaraj;J. Gregory;R. Joseph;Shantanu Thakar;Brual C. Shah;Jeremy A. Marvel;Satyandra K. Gupta
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