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Zhe Zhang

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#machine learning Preprint Jul 2025

Linearly Convergent Algorithms for Nonsmooth Problems with Unknown Smooth Regions

A verifiable and accurate termination criterion for PWS optimization is introduced and like the gradient norm in smooth optimization, this certificate tightly characterizes the optimality gap under the QG condition and can be evaluated without knowledge of any problem parameters.

Zhe Zhang, Suvrit Sra · 1 citation
Preprint Sep 2026

Accelerated Prox-Level Methods for Unknown Piecewise-Smooth Optimization II: Function-constrained Optimization

We introduce an anytime, almost parameter-free algorithm for convex function-constrained optimization, in which the objective and constraint functions are unknown piecewise-smooth. Our algorithm, Restarted Penalty APEX (Penalty Accelerated Prox-level method for Exploring Piecewise Smoothness), is an accelerated bundle-...

Zhen-Wei Lin, Zhe Zhang · 1 citation
Preprint Jul 2026

Optimal Parameter-Free First-Order Methods for Convex Optimization with Unknown Growth and Smoothness

We study deterministic first-order minimization of a convex function without prior knowledge of the objective's growth, smoothness regime, or associated parameters. We develop anytime, parameter-free bundle-level methods that adapt simultaneously to these unknown properties and attain best-known oracle complexities. Fo...

Liwei Jiang, Ke Tang, Zhe Zhang · 1 citation

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