Online Recommendations for Agents with Discounted Adaptive Preferences

• URL: http://arxiv.org/abs/2302.06014v2
• Date: Tue, 6 Feb 2024 16:08:10 GMT
• Title: Online Recommendations for Agents with Discounted Adaptive Preferences
• Authors: Arpit Agarwal, William Brown
• Abstract summary: bandit recommendations problem in which an agent's preferences evolve as a function of past selections. We show an algorithm which obtains efficient sublinear regret with respect to nearly the $textitentire$ item simplex.
• Score: 17.501559059079806
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We consider a bandit recommendations problem in which an agent's preferences (representing selection probabilities over recommended items) evolve as a function of past selections, according to an unknown $\textit{preference model}$. In each round, we show a menu of $k$ items (out of $n$ total) to the agent, who then chooses a single item, and we aim to minimize regret with respect to some $\textit{target set}$ (a subset of the item simplex) for adversarial losses over the agent's choices. Extending the setting from Agarwal and Brown (2022), where uniform-memory agents were considered, here we allow for non-uniform memory in which a discount factor is applied to the agent's memory vector at each subsequent round. In the "long-term memory" regime (when the effective memory horizon scales with $T$ sublinearly), we show that efficient sublinear regret is obtainable with respect to the set of $\textit{everywhere instantaneously realizable distributions}$ (the "EIRD set", as formulated in prior work) for any $\textit{smooth}$ preference model. Further, for preferences which are bounded above and below by linear functions of memory weight (we call these "scale-bounded" preferences) we give an algorithm which obtains efficient sublinear regret with respect to nearly the $\textit{entire}$ item simplex. We show an NP-hardness result for expanding to targets beyond EIRD in general. In the "short-term memory" regime (when the memory horizon is constant), we show that scale-bounded preferences again enable efficient sublinear regret for nearly the entire simplex even without smoothness if losses do not change too frequently, yet we show an information-theoretic barrier for competing against the EIRD set under arbitrary smooth preference models even when losses are constant.

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