Search Results for author: ZhiYu Zhang

Found 12 papers, 4 papers with code

Graph neural network-based surrogate modelling for real-time hydraulic prediction of urban drainage networks

1 code implementation16 Apr 2024 ZhiYu Zhang, Chenkaixiang Lu, Wenchong Tian, Zhenliang Liao, Zhiguo Yuan

As the model structure adheres to the flow routing mechanisms and hydraulic constraints in urban drainage networks, it provides an interpretable and effective solution for data-driven surrogate modelling.

Efficient Dynamic-NeRF Based Volumetric Video Coding with Rate Distortion Optimization

no code implementations2 Feb 2024 ZhiYu Zhang, Guo Lu, Huanxiong Liang, Anni Tang, Qiang Hu, Li Song

Volumetric videos, benefiting from immersive 3D realism and interactivity, hold vast potential for various applications, while the tremendous data volume poses significant challenges for compression.

Video Compression

Understanding Adam Optimizer via Online Learning of Updates: Adam is FTRL in Disguise

no code implementations2 Feb 2024 Kwangjun Ahn, ZhiYu Zhang, Yunbum Kook, Yan Dai

In this work, we provide a different perspective based on online learning that underscores the importance of Adam's algorithmic components.

Improving Adaptive Online Learning Using Refined Discretization

no code implementations27 Sep 2023 ZhiYu Zhang, Heng Yang, Ashok Cutkosky, Ioannis Ch. Paschalidis

Motivated by the pursuit of instance optimality, we propose a new algorithm that simultaneously achieves ($i$) the AdaGrad-style second order gradient adaptivity; and ($ii$) the comparator norm adaptivity also known as "parameter freeness" in the literature.

Optimal Comparator Adaptive Online Learning with Switching Cost

1 code implementation13 May 2022 ZhiYu Zhang, Ashok Cutkosky, Ioannis Ch. Paschalidis

Practical online learning tasks are often naturally defined on unconstrained domains, where optimal algorithms for general convex losses are characterized by the notion of comparator adaptivity.

Generative Compression for Face Video: A Hybrid Scheme

no code implementations21 Apr 2022 Anni Tang, Yan Huang, Jun Ling, ZhiYu Zhang, Yiwei Zhang, Rong Xie, Li Song

As the latest video coding standard, versatile video coding (VVC) has shown its ability in retaining pixel quality.

PDE-Based Optimal Strategy for Unconstrained Online Learning

1 code implementation19 Jan 2022 ZhiYu Zhang, Ashok Cutkosky, Ioannis Paschalidis

Unconstrained Online Linear Optimization (OLO) is a practical problem setting to study the training of machine learning models.

Adversarial Tracking Control via Strongly Adaptive Online Learning with Memory

no code implementations2 Feb 2021 ZhiYu Zhang, Ashok Cutkosky, Ioannis Ch. Paschalidis

Next, considering a related problem called online learning with memory, we construct a novel strongly adaptive algorithm that uses our first contribution as a building block.

Provable Hierarchical Imitation Learning via EM

1 code implementation7 Oct 2020 ZhiYu Zhang, Ioannis Paschalidis

Due to recent empirical successes, the options framework for hierarchical reinforcement learning is gaining increasing popularity.

Hierarchical Reinforcement Learning Imitation Learning

Bias-Compensated Normalized Maximum Correntropy Criterion Algorithm for System Identification with Noisy Input

no code implementations23 Nov 2017 Wentao Ma, Dongqiao Zheng, Yuanhao Li, ZhiYu Zhang, Badong Chen

This paper proposed a bias-compensated normalized maximum correntropy criterion (BCNMCC) algorithm charactered by its low steady-state misalignment for system identification with noisy input in an impulsive output noise environment.

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