Search Results for author: Jin Zhang

Found 32 papers, 5 papers with code

Distributed Optimal Output Consensus of Uncertain Nonlinear Multi-Agent Systems over Unbalanced Directed Networks via Output Feedback

no code implementations16 Nov 2021 Jin Zhang, Lu Liu, Xinghu Wang, Haibo Ji

In this note, a novel observer-based output feedback control approach is proposed to address the distributed optimal output consensus problem of uncertain nonlinear multi-agent systems in the normal form over unbalanced directed graphs.

ViDA-MAN: Visual Dialog with Digital Humans

no code implementations26 Oct 2021 Tong Shen, Jiawei Zuo, Fan Shi, Jin Zhang, Liqin Jiang, Meng Chen, Zhengchen Zhang, Wei zhang, Xiaodong He, Tao Mei

We demonstrate ViDA-MAN, a digital-human agent for multi-modal interaction, which offers realtime audio-visual responses to instant speech inquiries.

Speech Recognition Video Generation +1

Robust Multi-view Registration of Point Sets with Laplacian Mixture Model

no code implementations26 Oct 2021 Jin Zhang, Mingyang Zhao, Xin Jiang, Dong-Ming Yan

The proposed method assumes each data point is generated by a Laplacian Mixture Model (LMM), where its centers are determined by the corresponding points in other point sets.

3D Reconstruction

Value-Function-based Sequential Minimization for Bi-level Optimization

1 code implementation11 Oct 2021 Risheng Liu, Xuan Liu, Shangzhi Zeng, Jin Zhang, Yixuan Zhang

To our best knowledge, this is the first gradient-based algorithm that can solve different kinds of BLO problems (e. g., optimistic, pessimistic and with constraints) all with solid convergence guarantees.

Towards Gradient-based Bilevel Optimization with Non-convex Followers and Beyond

1 code implementation NeurIPS 2021 Risheng Liu, Yaohua Liu, Shangzhi Zeng, Jin Zhang

In particular, by introducing an auxiliary as initialization to guide the optimization dynamics and designing a pessimistic trajectory truncation operation, we construct a reliable approximate version of the original BLO in the absence of LLC hypothesis.

bilevel optimization

Hybrid Beamforming for RIS-Aided Communications: Fitness Landscape Analysis and Niching Genetic Algorithm

no code implementations19 Sep 2021 Bai Yan, Qi Zhao, Jin Zhang, J. Andrew Zhang, Xin Yao

To investigate the number and distribution of local optima, we conduct a fitness landscape analysis on the sum rate maximization problems.

Serial-EMD: Fast Empirical Mode Decomposition Method for Multi-dimensional Signals Based on Serialization

no code implementations22 Jun 2021 Jin Zhang, Fan Feng, Pere Marti-Puig, Cesar F. Caiafa, Zhe Sun, Feng Duan, Jordi Solé-Casals

Empirical mode decomposition (EMD) has developed into a prominent tool for adaptive, scale-based signal analysis in various fields like robotics, security and biomedical engineering.

Time Series

A Value-Function-based Interior-point Method for Non-convex Bi-level Optimization

no code implementations15 Jun 2021 Risheng Liu, Xuan Liu, Xiaoming Yuan, Shangzhi Zeng, Jin Zhang

Bi-level optimization model is able to capture a wide range of complex learning tasks with practical interest.

Gridless Evolutionary Approach for Line Spectral Estimation with Unknown Model Order

no code implementations14 Jun 2021 Bai Yan, Qi Zhao, Jin Zhang, J. Andrew Zhang, Xin Yao

To overcome the above shortcomings of relaxation, we propose a novel idea of simultaneously estimating the frequencies and model order by means of the atomic $l_0$ norm.

Multiobjective Optimization

Multiobjective Bilevel Evolutionary Approach for Off-Grid Direction-of-Arrival Estimation

no code implementations14 Jun 2021 Bai Yan, Qi Zhao, Jin Zhang, J. Andrew Zhang, Xin Yao

We formulate a multiobjective off-grid DOA estimation model to realize this idea, by which the source number can be automatically identified together with DOA estimation.

Direction of Arrival Estimation

Active Hierarchical Exploration with Stable Subgoal Representation Learning

no code implementations31 May 2021 Siyuan Li, Jin Zhang, Jianhao Wang, Yang Yu, Chongjie Zhang

Although GCHRL possesses superior exploration ability by decomposing tasks via subgoals, existing GCHRL methods struggle in temporally extended tasks with sparse external rewards, since the high-level policy learning relies on external rewards.

Continuous Control Hierarchical Reinforcement Learning +1

Parallel Scale-wise Attention Network for Effective Scene Text Recognition

no code implementations25 Apr 2021 Usman Sajid, Michael Chow, Jin Zhang, Taejoon Kim, Guanghui Wang

To address these issues, we propose a new multi-scale and encoder-based attention network for text recognition that performs the multi-scale FE and VA in parallel.

Scene Text Scene Text Recognition

Temporal Consistency Two-Stream CNN for Human Motion Prediction

no code implementations11 Apr 2021 Jin Tang, Jin Zhang, Jianqin Yin

In this paper, we propose a novel temporal fusion (TF) module to fuse the two-stream joints' information to predict human motion, including a temporal concatenation and a reinforcement trajectory spatial-temporal (TST) block, specifically designed to keep prediction temporal consistency.

Human motion prediction motion prediction

A General Descent Aggregation Framework for Gradient-based Bi-level Optimization

no code implementations16 Feb 2021 Risheng Liu, Pan Mu, Xiaoming Yuan, Shangzhi Zeng, Jin Zhang

In this work, we formulate BLOs from an optimistic bi-level viewpoint and establish a new gradient-based algorithmic framework, named Bi-level Descent Aggregation (BDA), to partially address the above issues.

Meta-Learning

Investigating Bi-Level Optimization for Learning and Vision from a Unified Perspective: A Survey and Beyond

1 code implementation27 Jan 2021 Risheng Liu, Jiaxin Gao, Jin Zhang, Deyu Meng, Zhouchen Lin

Bi-Level Optimization (BLO) is originated from the area of economic game theory and then introduced into the optimization community.

Hierarchical structure Meta-Learning +1

Engineering Three Dimensional Moiré Flat Bands

no code implementations17 Dec 2020 Lede Xian, Ammon Fischer, Martin Claassen, Jin Zhang, Angel Rubio, Dante M. Kennes

For many two dimensional van der Waals materials, twisting two adjacent layers with respect to each other leads to flat electronic bands in the two corresponding spatial directions -- a notion sometimes referred to as twistronics as it enables a wealth of physical phenomena.

Materials Science Statistical Mechanics Strongly Correlated Electrons Superconductivity

A Generic First-Order Algorithmic Framework for Bi-Level Programming Beyond Lower-Level Singleton

no code implementations ICML 2020 Risheng Liu, Pan Mu, Xiaoming Yuan, Shangzhi Zeng, Jin Zhang

In recent years, a variety of gradient-based first-order methods have been developed to solve bi-level optimization problems for learning applications.

Meta-Learning

Multi-modal Datasets for Super-resolution

no code implementations13 Apr 2020 Haoran Li, Weihong Quan, Meijun Yan, Jin Zhang, Xiaoli Gong, Jin Zhou

However, due to the variety of image degradation types in the real world, models trained on single-modal simulation datasets do not always have good robustness and generalization ability in different degradation scenarios.

Super-Resolution

Research on a New Convolutional Neural Network Model Combined with Random Edges Adding

no code implementations17 Mar 2020 Xuanyu Shu, Jin Zhang, Sen Tian, Sheng Chen, Lingyu Chen

Based on the idea of small world network, a random edge adding algorithm is proposed to improve the performance of convolutional neural network model.

A Fast deflation Method for Sparse Principal Component Analysis via Subspace Projections

no code implementations3 Dec 2019 Cong Xu, Min Yang, Jin Zhang

The implementation of conventional sparse principal component analysis (SPCA) on high-dimensional data sets has become a time consuming work.

Testing and verification of neural-network-based safety-critical control software: A systematic literature review

no code implementations5 Oct 2019 Jin Zhang, Jingyue Li

Objective: With the increase in studies on the T&V of NN-based control software in safety-critical domains, it is important to systematically review the state-of-the-art T&V methodologies, to classify approaches and tools that are invented, and to identify challenges and gaps for future studies.

A TWO-STAGE FRAMEWORK FOR MATHEMATICAL EXPRESSION RECOGNITION

no code implementations25 Sep 2019 Jin Zhang, Weipeng Ming, PengFei Liu

In the first stage, this method locates and recognizes the math symbols of input image by object detection algorithm.

Object Detection

Investigating Customization Strategies and Convergence Behaviors of Task-specific ADMM

no code implementations24 Sep 2019 Risheng Liu, Pan Mu, Jin Zhang

Alternating Direction Method of Multiplier (ADMM) has been a popular algorithmic framework for separable optimization problems with linear constraints.

Bilevel Integrative Optimization for Ill-posed Inverse Problems

no code implementations6 Jul 2019 Risheng Liu, Long Ma, Xiaoming Yuan, Shangzhi Zeng, Jin Zhang

Classical optimization techniques often formulate the feasibility of the problems as set, equality or inequality constraints.

USE-Net: incorporating Squeeze-and-Excitation blocks into U-Net for prostate zonal segmentation of multi-institutional MRI datasets

no code implementations17 Apr 2019 Leonardo Rundo, Changhee Han, Yudai Nagano, Jin Zhang, Ryuichiro Hataya, Carmelo Militello, Andrea Tangherloni, Marco S. Nobile, Claudio Ferretti, Daniela Besozzi, Maria Carla Gilardi, Salvatore Vitabile, Giancarlo Mauri, Hideki Nakayama, Paolo Cazzaniga

The following mixed scheme is used for training/testing: (i) training on either each individual dataset or multiple prostate MRI datasets and (ii) testing on all three datasets with all possible training/testing combinations.

Fast Botnet Detection From Streaming Logs Using Online Lanczos Method

no code implementations19 Dec 2018 Zheng Chen, Xinli Yu, Chi Zhang, Jin Zhang, Cui Lin, Bo Song, Jianliang Gao, Xiaohua Hu, Wei-Shih Yang, Erjia Yan

Botnet, a group of coordinated bots, is becoming the main platform of malicious Internet activities like DDOS, click fraud, web scraping, spam/rumor distribution, etc.

Improving Medical Short Text Classification with Semantic Expansion Using Word-Cluster Embedding

no code implementations5 Dec 2018 Ying Shen, Qiang Zhang, Jin Zhang, Jiyue Huang, Yuming Lu, Kai Lei

However, in electronic medical records (EMR), the texts containing sentences are shorter than that in general domain, which leads to the lack of semantic features and the ambiguity of semantic.

Classification General Classification +1

Preference Completion: Large-scale Collaborative Ranking from Pairwise Comparisons

1 code implementation16 Jul 2015 Dohyung Park, Joe Neeman, Jin Zhang, Sujay Sanghavi, Inderjit S. Dhillon

In this paper we consider the collaborative ranking setting: a pool of users each provides a small number of pairwise preferences between $d$ possible items; from these we need to predict preferences of the users for items they have not yet seen.

Collaborative Filtering Collaborative Ranking +1

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