Search Results for author: Yifei Li

Found 46 papers, 20 papers with code

Impact of Grid-Forming Inverters on Protective Relays: A Perspective for Current Limiting Control Design

no code implementations7 May 2025 Yifei Li, Heng Wu, Xiongfei Wang

It is further found that even with a highly inductive virtual impedance, the altered virtual impedance dynamics introduced by the CLC can still lead to malfunctions of the incremental quantity-based supervising elements.

A Protection-Interoperable Fault Ride-Through Control for Grid-Forming Inverters

no code implementations30 Apr 2025 Yifei Li, Heng Wu, Xiongfei Wang

This method dynamically adjusts power control of GFM-IBRs in response to the changes in output impedance, effectively mitigating variations in source dynamics and thereby preserving the reliability of incremental quantity-based supervising elements.

Analysis of Power Swing Characteristics of Grid-Forming VSC System Considering the Current Limitation Mode

no code implementations16 Apr 2025 Yongxin Xiong, Heng Wu, Yifei Li, Xiongfei Wang

This paper investigates power swing characteristics of grid-forming voltage source converter (GFM-VSC) systems considering the current limitation mode in both non-inertial and inertial GFM-VSC systems.

LocalEscaper: A Weakly-supervised Framework with Regional Reconstruction for Scalable Neural TSP Solvers

no code implementations18 Feb 2025 Junrui Wen, Yifei Li, Bart Selman, Kun He

Neural solvers have shown significant potential in solving the Traveling Salesman Problem (TSP), yet current approaches face significant challenges.

Reinforcement Learning (RL) Traveling Salesman Problem +1

Universal Lesion Segmentation Challenge 2023: A Comparative Research of Different Algorithms

1 code implementation14 Feb 2025 Kaiwen Shi, Yifei Li, Binh Ho, Jovian Wang, Kobe Guo

In recent years, machine learning algorithms have achieved much success in segmenting lesions across various tissues.

Lesion Segmentation

OVO-Bench: How Far is Your Video-LLMs from Real-World Online Video Understanding?

1 code implementation9 Jan 2025 Yifei Li, Junbo Niu, Ziyang Miao, Chunjiang Ge, Yuanhang Zhou, Qihao He, Xiaoyi Dong, Haodong Duan, Shuangrui Ding, Rui Qian, Pan Zhang, Yuhang Zang, Yuhang Cao, Conghui He, Jiaqi Wang

OVO-Bench evaluates the ability of video LLMs to reason and respond to events occurring at specific timestamps under three distinct scenarios: (1) Backward tracing: trace back to past events to answer the question.

Benchmarking Video Understanding

Timestamp calibration for time-series single cell RNA-seq expression data

1 code implementation4 Dec 2024 Xiran Chen, Sha Lin, Xiaofeng Chen, Weikai Li, Yifei Li

To tackle this challenge, we have developed a novel timestamp calibration model called ScPace for handling noisy labeled time-series ScRNA-seq data.

Time Series

Lattice-based stochastic models motivate non-linear diffusion descriptions of memory-based dispersal

1 code implementation14 Nov 2024 Yifei Li, Matthew J Simpson, Chuncheng Wang

The advantage of working with the individual-based model is that it is straightforward to propose and implement memory effects within the simulation in a way that is more biologically intuitive than simply proposing heuristic extensions of classical PDE models.

Automating Exploratory Proteomics Research via Language Models

no code implementations6 Nov 2024 Ning Ding, Shang Qu, Linhai Xie, Yifei Li, Zaoqu Liu, Kaiyan Zhang, Yibai Xiong, Yuxin Zuo, Zhangren Chen, Ermo Hua, Xingtai Lv, Youbang Sun, Yang Li, Dong Li, Fuchu He, BoWen Zhou

By automating complex proteomics analysis workflows and hypothesis generation, PROTEUS has the potential to considerably accelerate the pace of scientific discovery in proteomics research, enabling researchers to efficiently explore large-scale datasets and uncover biological insights.

scientific discovery

Few-shot Open Relation Extraction with Gaussian Prototype and Adaptive Margin

no code implementations27 Oct 2024 Tianlin Guo, Lingling Zhang, Jiaxin Wang, Yuokuo Lei, Yifei Li, Haofen Wang, Jun Liu

FsRE with NOTA is more challenging than the conventional few-shot relation extraction task, since the boundaries of unknown classes are complex and difficult to learn.

Contrastive Learning Meta-Learning +3

Deep reinforcement learning with symmetric data augmentation applied for aircraft lateral attitude tracking control

no code implementations13 Jul 2024 Yifei Li, Erik-Jan van Kampen

The firstly developed algorithm is named as Deep Deterministic Policy Gradient with Symmetric Data Augmentation (DDPG-SDA), which enriches dataset of standard DDPG algorithm by symmetric data augmentation method under symmetry assumption of a dynamical system.

Data Augmentation Deep Reinforcement Learning +1

Learning Physical Simulation with Message Passing Transformer

no code implementations10 Jun 2024 Zeyi Xu, Yifei Li

We propose a new universal architecture based on Graph Neural Network, the Message Passing Transformer, which incorporates a Message Passing framework, employs an Encoder-Processor-Decoder structure, and applies Graph Fourier Loss as loss function for model optimization.

Attribute Decoder +2

NeuralFluid: Neural Fluidic System Design and Control with Differentiable Simulation

no code implementations22 May 2024 Yifei Li, Yuchen Sun, Pingchuan Ma, Eftychios Sifakis, Tao Du, Bo Zhu, Wojciech Matusik

We present a novel framework to explore neural control and design of complex fluidic systems with dynamic solid boundaries.

TheaterGen: Character Management with LLM for Consistent Multi-turn Image Generation

1 code implementation29 Apr 2024 Junhao Cheng, Baiqiao Yin, Kaixin Cai, Minbin Huang, Hanhui Li, Yuxin He, Xi Lu, Yue Li, Yifei Li, Yuhao Cheng, Yiqiang Yan, Xiaodan Liang

To address this issue, we introduce TheaterGen, a training-free framework that integrates large language models (LLMs) and text-to-image (T2I) models to provide the capability of multi-turn image generation.

Denoising Image Generation +2

Resolution-Agnostic Neural Compression for High-Fidelity Portrait Video Conferencing via Implicit Radiance Fields

no code implementations26 Feb 2024 Yifei Li, Xiaohong Liu, Yicong Peng, Guangtao Zhai, Jun Zhou

In this paper, we propose a novel low bandwidth neural compression approach for high-fidelity portrait video conferencing using implicit radiance fields to achieve both major objectives.

Video Compression

AttributionBench: How Hard is Automatic Attribution Evaluation?

1 code implementation23 Feb 2024 Yifei Li, Xiang Yue, Zeyi Liao, Huan Sun

Modern generative search engines enhance the reliability of large language model (LLM) responses by providing cited evidence.

Binary Classification Language Modeling +2

Math-Shepherd: Verify and Reinforce LLMs Step-by-step without Human Annotations

2 code implementations14 Dec 2023 Peiyi Wang, Lei LI, Zhihong Shao, R. X. Xu, Damai Dai, Yifei Li, Deli Chen, Y. Wu, Zhifang Sui

In this paper, we present an innovative process-oriented math process reward model called \textbf{Math-Shepherd}, which assigns a reward score to each step of math problem solutions.

Ranked #24 on Arithmetic Reasoning on GSM8K (using extra training data)

Arithmetic Reasoning GSM8K +3

DiffAvatar: Simulation-Ready Garment Optimization with Differentiable Simulation

no code implementations CVPR 2024 Yifei Li, Hsiao-yu Chen, Egor Larionov, Nikolaos Sarafianos, Wojciech Matusik, Tuur Stuyck

By integrating physical simulation into the optimization loop and accounting for the complex nonlinear behavior of cloth and its intricate interaction with the body, our framework recovers body and garment geometry and extracts important material parameters in a physically plausible way.

Physical Simulations

Robust Control of Unknown Switched Linear Systems from Noisy Data

no code implementations19 Nov 2023 Wenjie Liu, Yifei Li, Jian Sun, Gang Wang, Jie Chen

This paper investigates the problem of data-driven stabilization for linear discrete-time switched systems with unknown switching dynamics.

TableLlama: Towards Open Large Generalist Models for Tables

no code implementations North American Chapter of the Association for Computational Linguistics 2024 Tianshu Zhang, Xiang Yue, Yifei Li, Huan Sun

Towards that end, we construct TableInstruct, a new dataset with a variety of realistic tables and tasks, for instruction tuning and evaluating LLMs.

Column Type Annotation

Efficacy Analysis of Power Swing Blocking and Out-of-Step Tripping Functions in Grid-Following VSC Systems

no code implementations9 Nov 2023 Yongxin Xiong, Heng Wu, Xiongfei Wang, Yifei Li

Power flow oscillations can occur in power systems after major disturbances such as system faults, which may result in significant power swings and even lead to system collapse.

Blocking

ADMM Algorithms for Residual Network Training: Convergence Analysis and Parallel Implementation

no code implementations23 Oct 2023 Jintao Xu, Yifei Li, Wenxun Xing

We propose both serial and parallel proximal (linearized) alternating direction method of multipliers (ADMM) algorithms for training residual neural networks.

Computational Efficiency

Self-triggered Consensus Control of Multi-agent Systems from Data

no code implementations19 Oct 2023 Yifei Li, Xin Wang, Jian Sun, Gang Wang, Jie Chen

In the presence of external disturbances, a model-based STC scheme is put forth for $\mathcal{H}_{\infty}$-consensus of MASs, serving as a baseline for the data-driven STC.

Data-driven Polytopic Output Synchronization of Heterogeneous Multi-agent Systems from Noisy Data

no code implementations14 Jul 2023 Yifei Li, Wenjie Liu, Jian Sun, Gang Wang, Lihua Xie, Jie Chen

This method utilizes measured data and a noise-matrix polytope to ensure near-optimal output synchronization.

Can LLMs Express Their Uncertainty? An Empirical Evaluation of Confidence Elicitation in LLMs

1 code implementation22 Jun 2023 Miao Xiong, Zhiyuan Hu, Xinyang Lu, Yifei Li, Jie Fu, Junxian He, Bryan Hooi

To better break down the problem, we define a systematic framework with three components: prompting strategies for eliciting verbalized confidence, sampling methods for generating multiple responses, and aggregation techniques for computing consistency.

Arithmetic Reasoning Benchmarking +1

Neural Characteristic Function Learning for Conditional Image Generation

1 code implementation ICCV 2023 Shengxi Li, Jialu Zhang, Yifei Li, Mai Xu, Xin Deng, Li Li

The emergence of conditional generative adversarial networks (cGANs) has revolutionised the way we approach and control the generation, by means of adversarially learning joint distributions of data and auxiliary information.

Conditional Image Generation Generative Adversarial Network

A Survey on Knowledge-Enhanced Pre-trained Language Models

no code implementations27 Dec 2022 Chaoqi Zhen, Yanlei Shang, Xiangyu Liu, Yifei Li, Yong Chen, Dell Zhang

Natural Language Processing (NLP) has been revolutionized by the use of Pre-trained Language Models (PLMs) such as BERT.

Survey

Input-Tuning: Adapting Unfamiliar Inputs to Frozen Pretrained Models

no code implementations7 Mar 2022 Shengnan An, Yifei Li, Zeqi Lin, Qian Liu, Bei Chen, Qiang Fu, Weizhu Chen, Nanning Zheng, Jian-Guang Lou

This motivates us to propose input-tuning, which fine-tunes both the continuous prompts and the input representations, leading to a more effective way to adapt unfamiliar inputs to frozen PLMs.

Language Modeling Language Modelling +2

Does Text Attract Attention on E-Commerce Images: A Novel Saliency Prediction Dataset and Method

1 code implementation CVPR 2022 Lai Jiang, Yifei Li, Shengxi Li, Mai Xu, Se Lei, Yichen Guo, Bo Huang

E-commerce images are playing a central role in attracting people's attention when retailing and shopping online, and an accurate attention prediction is of significant importance for both customers and retailers, where its research is yet to start.

Multi-Task Learning Saliency Prediction +1

Interpreting how nonlinear diffusion affects the fate of bistable populations using a discrete modelling framework

1 code implementation21 Dec 2021 Yifei Li, Pascal R. Buenzli, Matthew J. Simpson

One way of exploring this question is to study population dynamics using reaction-diffusion equations, where migration is usually represented as a linear diffusion term, and birth-death is represented with a bistable source term.

DiffCloth: Differentiable Cloth Simulation with Dry Frictional Contact

1 code implementation9 Jun 2021 Yifei Li, Tao Du, Kui Wu, Jie Xu, Wojciech Matusik

This work presents a differentiable cloth simulator whose additional gradient information facilitates cloth-related applications.

Extinction of bistable populations is affected by the shape of their initial spatial distribution

1 code implementation5 Jan 2021 Yifei Li, Stuart T. Johnston, Pascal R. Buenzli, Peter van Heijster, Matthew J. Simpson

In this work we study population survival or extinction using a stochastic, discrete lattice-based random walk model where individuals undergo movement, birth and death events.

Position

An energy-stable parametric finite element method for anisotropic surface diffusion

no code implementations10 Dec 2020 Yifei Li, Weizhu Bao

We propose an energy-stable parametric finite element method (ES-PFEM) to discretize the motion of a closed curve under surface diffusion with an anisotropic surface energy $\gamma(\theta)$ -- anisotropic surface diffusion -- in two dimensions, while $\theta$ is the angle between the outward unit normal vector and the vertical axis.

Numerical Analysis Numerical Analysis

FrequentNet: A Novel Interpretable Deep Learning Model for Image Classification

1 code implementation4 Jan 2020 Yifei Li, Kuangyan Song, Yiming Sun, Liao Zhu

This paper has proposed a new baseline deep learning model of more benefits for image classification.

Classification Deep Learning +2

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