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Han Zhong

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#machine learning Preprint Sep 2026

Minimax-Optimal Online Contract Design with Unrestricted Bounded Contracts

We study repeated contract design when a principal observes outcomes but not the actions that generate them. The principal may use any bounded outcome-contingent payment vector, and the agent's best response can make expected profit discontinuous in those payments. For every fixed number $m\ge2$ of outcomes, the minima...

Rui Ai, David Simchi-Levi, Han Zhong · 0 citations
Preprint Aug 2026

Interaction Is Not Necessary for Order-Optimal 1-Bit Mean Estimation

A randomized fully non-adaptive protocol is constructed that fixes all queries before observing the data and matches the optimal adaptive sample complexity, giving a negative answer to the COLT 2026 open problem asking whether interaction is necessary for order-optimal one-bit mean estimation.

Jiachen Hu, Han Zhong · 0 citations

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