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Semi-supervised regression via parallel field regularization

Semi-supervised regression via parallel field regularization

引用

25th Annual Conference on Neural Information Processing systems 2011, NIPS 2011

作者： Lin, Binbin Zhang, Chiyuan He, Xiaofei State Key Lab. of CAD and CG College of Computer Science Zhejiang University Hangzhou 310058 China

ISBN: (纸本)9781618395993

This paper studies the problem of semi-supervised learning from the vector field perspective. Many of the existing work use the graph Laplacian to ensure the smoothness of the prediction function on the data manifold. However, beyond smoothness, it is suggested by recent theoretical work that we should ensure second order smoothness for achieving faster rates of convergence for semisupervised regression problems. To achieve this goal, we show that the second order smoothness measures the linearity of the function, and the gradient field of a linear function has to be a parallel vector field. Consequently, we propose to find a function which minimizes the empirical error, and simultaneously requires its gradient field to be as parallel as possible. We give a continuous objective function on the manifold and discuss how to discretize it by using random points. The discretized optimization problem turns out to be a sparse linear system which can be solved very efficiently. The experimental results have demonstrated the effectiveness of our proposed approach.

关键词： Supervised learning

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A new method of interactive marker-driven free form mesh deformation

A new method of interactive marker-driven free form mesh def...

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Geometric Modeling and Imaging New Trends, 2006

作者： Difei, Lu Ying, Zhang Xiuzi, Ye College of Computer Science State Key Lab. of CAD and CG Zhejiang University Hangzhou 310027 China

ISBN: (纸本)0769526047

In this paper, we propose a new scheme for marker-driven free form global mesh deformation without manually establishing a skeleton orfreeform deformation domain beforehand. It allows a user to deform a given mesh interactively and intuitively. Firstly markers are placed at existing mesh vertices. Then user moves markers as constrained handles in a free form style. Next a global shape deformation is obtained by reconstructing the shape corresponding to the translated markers. Finally the system smooth the deformed mesh to get desired result. Our approach successfully conveys a sense of rigidity of the mesh, which is difficult in space-warp approaches. We demonstrate that our system can be used to intuitively deform a complex mesh with very little effort. We also show that our approach of the deformation provides a natural way to interpolate between key frames, allowing production of simple key framed animations. © 2006 IEEE.

关键词： Interactive computer graphics

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Scenery image annotation based on enhanced region semantic analysis 3

Scenery image annotation based on enhanced region semantic a...

引用

3rd International Workshop on Advanced Computational Intelligence and Intelligent Informatics, IWACIII 2013

作者： Lin, Ji Zhang, Jing Department of Computer Science and Engineering East China University of Science and Technology Shanghai China State Key Lab. for Novel Software Technology Nanjing University China

Automatic image annotation is a very essential technology cause the huge development of the multimedia and Internet. Recently, many approaches change multi-lab.l annotation problem to single-lab.l annotation problem while they are always time-consuming and useless to some extent. In this paper, we propose an enhanced region semantic analysis algorithm for scenery images annotation. It contains segmentation, clustering and mapping processes. We use the classical segmentation algorithm: normalized cuts and cluster patches with feature weight selection. Finally we relate cluster centers and keywords using statistical method. Experimental results show that our algorithm achieves promising performance with the scenery images and outperforms region semantic analysis algorithm on the same benchmark datasets.

关键词： Image annotation

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Performance evaluation of allgather algorithms on terascale Linux cluster with Fast Ethernet

Performance evaluation of allgather algorithms on terascale ...

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8th International Conference on High-Performance Computing in Asia-Pacific Region

作者： Chen, Jing Zhang, Linbo Zhang, Yunquan Yuan, Wei Department of Computer Science University of Science and Technology of China China Lab. of Parallel Computing Institute of Software CAS China State Key Laboratory of Computer Science China Academy of Mathematics and Systems Sciences CAS China

ISBN: (纸本)0769524869

We report our work on evaluating performance of several MPI Allgather algorithms on Fast Ethernet. These algorithms are ring, recursive doubling, Bruck, and neighbor exchange. The first three algorithms are widely used today. The neighbor exchange algorithm which was recently proposed by the authors incorporates pair-wise exchange, and is expected to perform better with certain configurations, mainly when using TCP/IP over Ethernet. We tested the four algorithms on terascale Linux clusters DeepComp 6800 and DAWNING 4000A using TCP/IP over Fast Ethernet. Results show that our neighbor exchange algorithm performs the best for long messages, the ring algorithm performs the best for medium-size messages and the recursive doubling algorithm performs the best for short messages.

关键词： computer networks

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Layered depth-of-field rendering using color spreading

Layered depth-of-field rendering using color spreading

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12th ACM SIGGRAPH International Conference on Virtual-Reality Continuum and Its Applications in Industry, VRCAI 2013

作者： Yu, Kai Wu, Shang Sheng, Bin Ma, Lizhuang Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai China State Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781450325905

Depth of field (DoF) is a depth range outside of which objects are blurred. DoF has been widely used in photography and films by artists and is expected to be applied to realistic image rendering and virtual reality applications in the area of computer graphics. This paper presents a framework that produces DoF effect with high quality and performance. It is a layered method rendering the scene into layers where spreading filter is used to directly get the output, reduce memory usage and improve the result comparing with other layered methods using gathering filter. Depth peeling is used to solve partial occlusion problem and modified to discard the insignificant occluded pixels so as to reduce the number of occluded layers. This framework can also eliminate artifacts such as intensity leakage and depth discontinuity, and is GPU-friendly. © 2013 ACM.

关键词： Graphics processing unit

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A method for detecting mismatch of time-aware Web services based on SMT

A method for detecting mismatch of time-aware Web services b...

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6th International Conference on computer science and Education, ICCSE 2011

作者： Xiyan, Wang Chen, Shenbiao Zhang, Guangquan Zhu, Jihan Wu, Jianfeng School of Computer Science and Technology Soochow University Suzhou 215006 China State Key Lab. of Computer Science Institute of Software Chinese Academy of Sciences Beijing 100190 China

ISBN: (纸本)9781424497188

Considering the timed properties between the interactions of Web services, we model the Web services with timed properties formally and propose a method for detecting mismatch of time-aware Web services based on Satisfiability Modulo Theories (SMT) in this paper. The issue of detecting mismatch of Web services can be transformed into the problem of existence model checking whether a deadlock is reachable or not between the interaction of the services, and the issue of existence model checking can be transformed into the problem whether the logic formula is satisfiable or not. © 2011 IEEE.

关键词： Web services

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Analysis of Moving Target Defense in Unbalanced and Multiphase Distribution systems Considering Voltage Stability

Analysis of Moving Target Defense in Unbalanced and Multipha...

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2021 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids, SmartGridComm 2021

作者： Liu, Mengxiang Zhao, Chengcheng Zhang, Zhenyong Deng, Ruilong Cheng, Peng College of Control Science and Engineering Zhejiang University State Key Lab. of Industrial Control Technology Hangzhou China College of Computer Science and Technology Guizhou University State Key Lab. of Public Big Data Guiyang China

ISBN: (纸本)9781665415026

Moving Target Defense (MTD) is a new technology to defend against the false data injection attack (FDIA) on distribution system state estimation (DSSE). It works by proactively perturbing the branch reactance. However, due to the challenges induced by the nonlinear dynamics and the coupling phases in the three-phase AC DSSE model, the analysis on the effectiveness and hiddenness of MTD, which are two essential performance metrics, has not yet been conducted. In this paper, we attempt to optimize the effectiveness and hiddenness of MTD while considering voltage stability. Firstly, we quantify the two metrics with approximated measurement residuals. Based on the quantified metrics, we formulate an optimization problem to maximize the effectiveness with guaranteed hiddenness and ensure voltage stability by minimizing the voltage variation induced by MTD. The original problem is transformed to a polynomial optimization problem based on the observation that the alteration of the projection matrix caused by reactance perturbation is neglectable, such that the near-optimal result can be obtained. Finally, extensive simulations are conducted on the IEEE 13-bus test feeder to evaluate the performance of the proposed MTD. © 2021 IEEE.

关键词： Network security

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Irregular community discovery for cloud service improvement

Irregular community discovery for cloud service improvement

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作者： Liu, Jin Zhou, Jing Wang, Junfeng Zhang, Feng Liu, Fei State Key Lab. of Software Engineering Wuhan University Wuhan 430072 China Lab. of Complex Systems and Intelligence Science Institute of Automation CAS Beijing 100190 China State Key Lab. for Novel Software Technology Nanjing University Nanjing China School of Computer Science Communication University of China Beijing 100024 China Key Lab. of Intelligent Information Processing Institute of Computing Technology CAS Beijing 100190 China College of Computer Science Sichuan University Chengdu 610064 China Software School Sun Yat-sen University Guangzhou 510006 China

Utility services provided by cloud computing rely on virtual customer communities forming spontaneously and evolving continuously. Clarifying the explicit boundaries of these communities is thus essential to the quality of utility services in cloud computing. Communities with overlapping features or prominent peripheral vertexes are usually typical irregular communities. Traditional community identification algorithms are limited in discovering irregular topological structures from CR networks, whereas these irregular shapes typically play an important role in finding prominent customers which are ignored in social CRM otherwise. We present a novel method of discovering irregular communities. It firstly finds and merges primitive maximal cliques and the irregular features of overlapping and prominent sparse vertices are further considered. An empirical case and a methodology comparison confirm the feasibility and efficiency of our approach. © 2012 Springer science+Business Media, LLC.

关键词： Cloud computing

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Dynamic topic detection and tracking based on knowledge base

Dynamic topic detection and tracking based on knowledge base

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2010 3rd IEEE International Conference on Broadband Network and Multimedia Technology, IC-BNMT2010

作者： Wang, Su Du, Junping Liang, Meiyu Chen, Liping Beijing Key Lab. of Intelligent Telecommunication Software and Multimedia School of Computer Science Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781424467709

In order to solve the sparse initial information problem when the topic model was established ever before, this paper establishes the Wikipedia based news event knowledge base. Referring to this knowledge base, we calculate the weight of the news model, make the similarity measurement based on the time distance, make the clustering based on time line, and apply the dynamic threshold strategy to detect and track the topics automatically in the news materials. The experiment result verifies the validity of this method. © 2010 IEEE.

关键词： Knowledge based systems

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Local gabor binary pattern random subspace method for eyeglasses-face recognition

Local gabor binary pattern random subspace method for eyegla...

引用

2010 3rd International Congress on Image and Signal Processing, CISP 2010

作者： Liu, Li Sun, Yanfeng Yin, Baocai Song, Caifang Beijing Key Lab. of Multimedia and Intelligent Software Technology College of Computer Science and Technology Beijing University of Technology Beijing China

ISBN: (纸本)9781424465149

In this paper, we introduce a novel Local Gabor Binary Pattern Random Subspace Method (LGBPRSM) for wearing-glasses face recognition. It extracts the discriminating features from facial space based on local-feature method, after that, it constructs multiple classifiers by randomly sampling from the feature set to gain more diversity between classifiers for efficiently recognizing the faces with glasses. Our experimental results on FERET and Yale database prove the advantages of the proposed approach when compared with other methods. ©2010 IEEE.

关键词： Face recognition

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