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- W4313447760 abstract "With the fast development of big data, it has been easier than before to learn the optimal decision rule by updating the decision rule recursively and making online decisions. We study the online statistical inference of model parameters in a contextual bandit framework of sequential decision-making. We propose a general framework for online and adaptive data collection environment that can update decision rules via weighted stochastic gradient descent. We allow different weighting schemes of the stochastic gradient and establish the asymptotic normality of the parameter estimator. Our proposed estimator significantly improves the asymptotic efficiency over the previous averaged SGD approach via inverse probability weights. We also conduct an optimality analysis on the weights in a linear regression setting. We provide a Bahadur representation of the proposed estimator and show that the remainder term in the Bahadur representation entails a slower convergence rate compared to classical SGD due to the adaptive data collection." @default.
- W4313447760 created "2023-01-06" @default.
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- W4313447760 date "2022-12-30" @default.
- W4313447760 modified "2023-09-24" @default.
- W4313447760 title "Online Statistical Inference for Contextual Bandits via Stochastic Gradient Descent" @default.
- W4313447760 doi "https://doi.org/10.48550/arxiv.2212.14883" @default.
- W4313447760 hasPublicationYear "2022" @default.
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