Author

Cheng Soon Ong

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#machine learning Preprint Sep 2026

Elicitation and Decision Geometry in Single-Index Bandits

We study two-arm contextual bandits with arm-specific single indices and a shared unknown monotone link. Monotonicity makes the optimal action depend only on the contrast between the index directions, hence arm-specific reward functions need not be estimated. We introduce Natural Boundary Learning (NBL), a greedy proce...

Sakshi Arya, Cheng Soon Ong · 0 citations