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International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： Yifan Lyu Hongzhou Wu Lixiang Liu Chuxiong Sun Institute of Software Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing China Parallel and Distributed Processing Lab National University of Defense Technology Changsha China Institute of Software Chinese Academy of Sciences Beijing China

ISBN: (数字)9798350368741

ISBN: (纸本)9798350368758

Temporal Language Grounding (TLG) aims to localize moments in untrimmed videos that are most relevant to natural language queries. While existing weakly-supervised methods have achieved significant success in exploring cross-modal relationships, they still face a critical bottleneck: the interference of task-irrelevant information in query embeddings. To address this issue, we propose TLG Frequency Spiking (TFS), a dimensional mask derived from the frequency domain that models the varying importance specific to different queries. By enhancing the understanding of queries, TFS effectively optimizes the cross-modal alignment of visual and textual modalities. Experimental results show that TFS significantly outperforms state-of-the-art baselines on both the Charades-STA and ActivityNet-Captions datasets.

关键词： Visualization Grounding Frequency-domain analysis Neural networks Natural languages Interference Signal processing Speech processing Faces Videos

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Coverage problem in wireless sensor network: A survey

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Journal of Networks 2010年第9期5卷 1033-1040页

作者： Fan, Gao Jun Jin, Shi Yao National Lab of Parallel and Distributed Processing National University of Defense Technology Chang Sha China

Wireless sensor networks constitute the platform of a broad range of applications related to national security, surveillance, military, health care, and environmental monitoring. The coverage of WSN has answered the questions about quality of service (surveillance) which can be provided by WSN. Therefore, maximizing coverage using the resource constrained nodes is a non-trivial problem. The coverage problem for wireless sensor network (WSN) has been studied extensively in recent years, especially when combined with connectivity and energy efficiency. In this paper we present a survey of coverage problem. And besides some basic design considerations in coverage of WSN we describe two challenges, namely, maximizing network lifetime and network connectivity. We also provide a brief summary and comparison of existing coverage schemes. © 2010 ACADEMY PUBLISHER.

关键词： Wireless sensor networks

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RIMP: Runtime IMplicit Predication

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6th International Workshop on Advanced parallel processing Technologies

作者： Tang, Y Deng, K Wang, XD Dou, Y Zhou, XM National Lab. for Parallel and Distributed Processing China

ISBN: (纸本)3540296395

If-conversion and predicated execution are widely adopted to eliminate branch misprediction penalty. Previous predication execution depends on compiler to generate explicit predicated instructions, In this paper, a trace-based predicate mechanism named RIMP (Runtime IMplicit Predication) is discussed. The candidates of if-conversion will be identified during dynamic execution. Conventional trace cache has been modified to store RIMP traces, which include instructions both from fall-through and target block following the conditional branch. Hardware extension will add predication to RIMP trace automatically. With the help of RIMP, legacy applications can benefit from predication mechanism without recompiling source code. Simulation of RIMP implementation under diverse microarchitecture configurations is presented in the paper. Results have shown promising performance improvement. In general, RIMP with 64kB trace storage delivers an average 10.3% IPC improvement while actually speeding up the execution time by over 7%.

关键词： predication trace cache runtime execution RIMP

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SCautz:a high performance and fault-tolerant datacenter network for modular datacenters

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Science China(Information Sciences) 2012年第7期55卷 1493-1508页

作者： HUANG Feng,LU XiCheng,LI DongSheng & ZHANG YiMing national lab for parallel and distributed processing,School of Computer,national University of Defense Technology,Changsha 410073,China 1. National Lab for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha 410073 China

Modular datacenters (MDCs) use shipping containers,encapsulating thousands of servers,as large pluggable building blocks for mega *** MDC’s "service-free" model poses stricter demand on fault-tolerance of the modular datacenter network (MDCN).Based on the "scale-out" principle,in this paper we propose SCautz,a novel hybrid intra-container network for *** comprises a base Kautz topology,created by interconnecting servers,and a small number of COTS (commercial off-the-shelf) ***,each switch connects a specific number of servers forming "clusters",which,as logical nodes,form multiple higher-level logical Kautz ***’s hybrid structure has several ***,it supports multiple running modes for the MDC,while its full structure increases network capacity ***,it retains the throughput for processing one-to-x traffic in the presence of ***,it achieves much more graceful network performance degradation than computation and storage capacity *** from theoretical analysis and simulations show that SCautz is more viable for intra-container networks.

关键词： modular datacenter network container Kautz fault-tolerant

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A virtual machine server aggregation algorithm based on hierarchical clustering

A virtual machine server aggregation algorithm based on hier...

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15th International Conference on parallel and distributed Systems, ICPADS '09

作者： Huang, Feng Li, Dongsheng National Lab for Parallel and Distributed Processing College of Computer Changsha China

ISBN: (纸本)9780769539003

Combining virtual machine technology and network computing technology will be able to effectively aggregate the widely distributed heterogeneous and autonomous resources in the Internet. This paper proposes a virtual machine server aggregation algorithm, called DVSA, based on hierarchical clustering method for virtual computing environment. According to network latencies, the algorithm clusters virtual machine servers into groups. If servers in the same group are scheduled, the latencies between virtual machines which host on these servers will be small, and the performance and stability of the distributed execution environment could be improved. © 2009 IEEE.

关键词： Virtual machine

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Reduction transformations for optimization parameter selection

Reduction transformations for optimization parameter selecti...

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8th International Conference on High-Performance Computing in Asia-Pacific Region, HPC Asia 2005

作者： Yonggang, Che Zhenghua, Wang Xiaomei, Li National Lab. for Parallel and Distributed Processing Changsha 410073 China

ISBN: (纸本)0769524869

Program performance optimization often involves choosing right parameters to minimize the program's runtime. Selecting optimization parameters by means of execution-driven search is guaranteed to find excellent results, for it accurately accounts for all performance components of the target platform. But the major drawback of execution-driven approach is the excessive compilation time due to thousands of runs of the original program. In this article, we propose a novel technique called program reduction transformations to reduce the cost of execution-driven optimization parameter selection. It is based on our observation to the characteristics of the scientific applications and the optimization parameter selection task. The ideal is to transform the program before it is used in execution-driven parameter selection procedure. The transformed program runs in much shorter time but preserves the parameter selection quality. This technique greatly reduces the time spent on evaluating each candidate parameter and makes execution-driven optimization parameter selection affordable. We formulate the theoretic foundation of program reduction transformation. And we find several situations where reduction transformations can be legally applied. These situations are common in scientific applications. Experiments done for two math kernels and three SPEC benchmarks show that our approach is both feasible and effective. © 2005 IEEE.

关键词： Parameter estimation

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Implementing Sparse Matrix-Vector multiplication using CUDA based on a hybrid sparse matrix format

Implementing Sparse Matrix-Vector multiplication using CUDA ...

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2010 International Conference on Computer Application and System Modeling, ICCASM 2010

作者： Cao, Wei Lu, Yao Li, Zongzhe Wang, Yongxian Wang, Zhenghua National Key Lab. for Parallel and Distributed Processing National University of Defense Technology Changsha China

ISBN: (纸本)9781424472369

The Sparse Matrix-Vector product (SpMV) is a key operation in engineering and scientific computing. Methods for efficiently implementing it in parallel are critical to the performance of many applications. Modern Graphics processing Units (GPUs) coupled with the advent of general purpose programming environments like NVIDIA's CUDA, have gained interest as a viable architecture for data-parallel general purpose computations. Currently, SpMV implementations using CUDA based on common sparse matrix format have already appeared. Among them, the performance of implementation based on ELLPACK-R format is the best. However, in this implementation, when the maximum number of nonzeros per row does substantially differ from the average, thread is suffering from load imbalance. This paper proposes a new matrix storage format called ELLPACK-RP, which combines ELLPACK-R format with JAD format, and implements the SpMV using CUDA based on it. The result proves that it can decrease the load imbalance and improve the SpMV performance efficiently. © 2010 IEEE.

关键词： Graphics processing unit

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Efficient virtual machine deployment in large scale resource environment

Efficient virtual machine deployment in large scale resource...

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16th IEEE International Conference on parallel and distributed Systems, ICPADS 2010

作者： Huang, Feng Li, Dongsheng National Lab. for Parallel and Distributed Processing College of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9780769543079

Combining virtual machine technology, virtual computing is able to effectively aggregate the widely distributed resources to provide users services. We view the federation of multiple data centers and voluntary resources on the Internet as a very large scale resource pool. Based on the tree structure of the pool, this paper proposes a virtual machine deployment algorithm, called iVDA, considers users' requests and the capabilities of the physical resources as well as the dynamic load, implements an adaptive mechanism to scheduling servers to host virtual machines forming virtual execution environments for various applications, and supports on-demand computing. © 2010 IEEE.

关键词： Dynamic loads

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An improved independent set ordering algorithm for solving large-scale sparse linear systems

An improved independent set ordering algorithm for solving l...

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International Conference on Intelligent Human-Machine Systems and Cybernetics

作者： Yao, Lu Cao, Wei Li, Zongzhe Wang, Yongxian Wang, Zhenghua National Key Lab. for Parallel and Distributed Processing National Univ. of Defense Technology Changsha China

ISBN: (纸本)9780769541518

The independent set ordering algorithm is a heuristic algorithm based on finding maximal independent sets of vertices in the matrix adjacency graph, which is commonly used for parallel matrix factorization. However, Disadvantages appear when it is applied to large-scale sparse linear systems. In this paper, we propose an improved algorithm by finding an optimal size of independent set in each elimination step rather than find a maximal independent set, which is proved to be effective by both theoretical analysis and parallel implementation. © 2010 IEEE.

关键词： Lower-upper decomposition

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A mobile recommendation system based on logistic regression and Gradient Boosting Decision Trees

A mobile recommendation system based on logistic regression ...

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2016 International Joint Conference on Neural Networks, IJCNN 2016

作者： Wang, Yaozheng Feng, Dawei Li, Dongsheng Chen, Xinyuan Zhao, Yunxiang Niu, Xin National Lab for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha410003 China

ISBN: (纸本)9781509006199

Real-life behaviors shown by the mobile users typically exhibit plenty noises, making it hard to construct an effective recommendation engine. In this paper, we present a fused model based on the LR algorithm and the GBDT algorithm to recommend vertical industry commodities in a mobile setting. A set of specifically designed methods are proposed to deal with the data preprocessing and feature extraction problem for the mobile recommendation scenario. The proposed method is evaluated on a large scale real-world dataset provided by the Alibaba mobile shopping department. Result on the F1 score has seen an improvement of 2%-36% compared with the baseline. © 2016 IEEE.

关键词： Recommender systems

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