Xiwen Tao — accepted AI-conference papers

2026

Finding Stationary Points by Comparisons

Helin Wang, Chenyi Zhang, Xiwen Tao, Yexin Zhang, Tongyang Li

ICML 2026poster

We study the problem of finding stationary points of non-convex functions when access to the objective is provided only through a comparison oracle that, given two points, outputs which has the larger function value. For a twice differentiable $f\colon\mathbb R^n\to\mathbb R$ with Lipschitz gradient…

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2026

Optimal Classical and Quantum Algorithms for Gradient Testing and Estimation by Comparisons

Xiwen Tao, Chenyi Zhang, Helin Wang, Yexin Zhang, Tongyang Li

ICML 2026poster

We study gradient testing and gradient estimation of smooth functions using only a comparison oracle that, given two points, indicates which one has the larger function value. For any smooth $f\colon\mathbb R^n\to\mathbb R$, $\mathbf{x}\in\mathbb R^n$, and $\varepsilon>0$, we design a gradient testi…

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