Search Results for author: Sihan Liu

Found 8 papers, 1 papers with code

Super Non-singular Decompositions of Polynomials and their Application to Robustly Learning Low-degree PTFs

no code implementations31 Mar 2024 Ilias Diakonikolas, Daniel M. Kane, Vasilis Kontonis, Sihan Liu, Nikos Zarifis

We study the efficient learnability of low-degree polynomial threshold functions (PTFs) in the presence of a constant fraction of adversarial corruptions.

PAC learning

Rotated Multi-Scale Interaction Network for Referring Remote Sensing Image Segmentation

1 code implementation19 Dec 2023 Sihan Liu, Yiwei Ma, Xiaoqing Zhang, Haowei Wang, Jiayi Ji, Xiaoshuai Sun, Rongrong Ji

Referring Remote Sensing Image Segmentation (RRSIS) is a new challenge that combines computer vision and natural language processing, delineating specific regions in aerial images as described by textual queries.

Image Segmentation Segmentation +1

Testing Closeness of Multivariate Distributions via Ramsey Theory

no code implementations22 Nov 2023 Ilias Diakonikolas, Daniel M. Kane, Sihan Liu

Our main result is the first closeness tester for this problem with {\em sub-learning} sample complexity in any fixed dimension and a nearly-matching sample complexity lower bound.

Online Robust Mean Estimation

no code implementations24 Oct 2023 Daniel M. Kane, Ilias Diakonikolas, Hanshen Xiao, Sihan Liu

We note that if the algorithm is allowed to wait until time $T$ to report its estimate, this reduces to the well-studied problem of robust mean estimation.

Exponential Hardness of Reinforcement Learning with Linear Function Approximation

no code implementations25 Feb 2023 Daniel Kane, Sihan Liu, Shachar Lovett, Gaurav Mahajan, Csaba Szepesvári, Gellért Weisz

The rewards in this game are chosen such that if the learner achieves large reward, then the learner's actions can be used to simulate solving a variant of 3-SAT, where (a) each variable shows up in a bounded number of clauses (b) if an instance has no solutions then it also has no solutions that satisfy more than (1-$\epsilon$)-fraction of clauses.

Learning Theory reinforcement-learning +1

Near-Optimal Bounds for Testing Histogram Distributions

no code implementations14 Jul 2022 Clément L. Canonne, Ilias Diakonikolas, Daniel M. Kane, Sihan Liu

We investigate the problem of testing whether a discrete probability distribution over an ordered domain is a histogram on a specified number of bins.

Computational-Statistical Gaps in Reinforcement Learning

no code implementations11 Feb 2022 Daniel Kane, Sihan Liu, Shachar Lovett, Gaurav Mahajan

In this work, we make progress on this open problem by presenting the first computational lower bound for RL with linear function approximation: unless NP=RP, no randomized polynomial time algorithm exists for deterministic transition MDPs with a constant number of actions and linear optimal value functions.

reinforcement-learning Reinforcement Learning (RL)

Convergence and Sample Complexity of SGD in GANs

no code implementations1 Dec 2020 Vasilis Kontonis, Sihan Liu, Christos Tzamos

Our main result is that by training the Generator together with a Discriminator according to the Stochastic Gradient Descent-Ascent iteration proposed by Goodfellow et al. yields a Generator distribution that approaches the target distribution of $f_*$.

Bilevel Optimization

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