Author

Zhi-Sen Jiang

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Preprint Sep 2026

Bi-ZOL: Bilevel Zeroth-Order Learning with Nonsmooth Responses

This paper studies lower-level-constrained bilevel optimization in a response-oracle setting, where lower-level model information is unavailable and the induced response mapping is locally Lipschitz but potentially nonsmooth. In this setting, the classical response Jacobian and reduced hypergradient may fail to exist....

Zhi-Sen Jiang, Saverio Bolognani · 0 citations