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The Vertical Block–cyclic Distributed Parallel LU Factorization Method (VBPLU) is effectively processed on a distributed memory parallel computer. VBPLU is based on the two techniques, the block algorithm and the aggregation of communications. Since startup time dominates the data communication and the aggregation reduces communication isssues, the total performance has been much improved. Furthermore this method uses long vectors so that it is also advantageous on vector processors. In this paper, we have constructed a modeling of VBPLU using a simplified LogGP model with analytical formulae, and estimated accurately the computational cost taking into account load distributions caused by data layout and process mapping. Some knowledge for optimization of block algorithm has been obtained. Our estimations have been verified through numerical experiments on three different distributed memory parallel computers. 相似文献
63.
Shigeo Abe 《Pattern Analysis & Applications》2007,10(3):203-214
In this paper we discuss sparse least squares support vector machines (sparse LS SVMs) trained in the empirical feature space,
which is spanned by the mapped training data. First, we show that the kernel associated with the empirical feature space gives
the same value with that of the kernel associated with the feature space if one of the arguments of the kernels is mapped
into the empirical feature space by the mapping function associated with the feature space. Using this fact, we show that
training and testing of kernel-based methods can be done in the empirical feature space and that training of LS SVMs in the
empirical feature space results in solving a set of linear equations. We then derive the sparse LS SVMs restricting the linearly
independent training data in the empirical feature space by the Cholesky factorization. Support vectors correspond to the
selected training data and they do not change even if the value of the margin parameter is changed. Thus for linear kernels,
the number of support vectors is the number of input variables at most. By computer experiments we show that we can reduce
the number of support vectors without deteriorating the generalization ability.
Shigeo Abe received the B.S. degree in Electronics Engineering, the M.S. degree in Electrical Engineering, and the Dr. Eng. degree, all from Kyoto University, Kyoto, Japan in 1970, 1972, and 1984, respectively. After 25 years in the industry, he was appointed as full professor of Electrical Engineering, Kobe University in April 1997. He is now a professor of Graduate School of Science and Technology, Kobe University. His research interests include pattern classification and function approximation using neural networks, fuzzy systems, and support vector machines. He is the author of Neural Networks and Fuzzy Systems (Kluwer, 1996), Pattern Classification (Springer, 2001), and Support Vector Machines for Pattern Classification (Springer, 2005). Dr. Abe was awarded an outstanding paper prize from the Institute of Electrical Engineers of Japan in 1984 and 1995. He is a member of IEEE, INNS, and several Japanese Societies. 相似文献
Shigeo AbeEmail: |
Shigeo Abe received the B.S. degree in Electronics Engineering, the M.S. degree in Electrical Engineering, and the Dr. Eng. degree, all from Kyoto University, Kyoto, Japan in 1970, 1972, and 1984, respectively. After 25 years in the industry, he was appointed as full professor of Electrical Engineering, Kobe University in April 1997. He is now a professor of Graduate School of Science and Technology, Kobe University. His research interests include pattern classification and function approximation using neural networks, fuzzy systems, and support vector machines. He is the author of Neural Networks and Fuzzy Systems (Kluwer, 1996), Pattern Classification (Springer, 2001), and Support Vector Machines for Pattern Classification (Springer, 2005). Dr. Abe was awarded an outstanding paper prize from the Institute of Electrical Engineers of Japan in 1984 and 1995. He is a member of IEEE, INNS, and several Japanese Societies. 相似文献
64.
This paper deals with the J-spectral factorization for general discrete rational matrices. A simple approach based on the Kalman filtering in Krein space is proposed. The main idea is to construct a stochastic state space filtering model in Krein space such that the spectral matrix of the output is equal to the rational matrix to be factorized. The spectral factor is then easily derived by using the generalized Kalman filtering in Krein space, which is similar to the H2 spectral factorization. Our approach unifies the treatment of the H2 spectral factorization and the J-spectral factorization. The applications of the derived results in H∞ and risk-sensitive estimation for both nonsingular and singular systems are demonstrated. 相似文献
65.
研究了行(列)酉对称矩阵的性质,修正了行(列)酉对称矩阵的QR分解的公式和快速算法.结果可减少行(列)酉对称矩阵的QR分解的计算量与存储量,并且不会丧失数值精度. 相似文献
66.
67.
《国际计算机数学杂志》2012,89(4):315-338
The numerical solution of partial differential equations in 3 dimensions by finite difference methods leads to the problem of solving large order sparse structured linear systems. In this paper, a factorization procedure in algorithmic form is derived yielding direct and iterative methods of solution of some interesting boundary value problems in physics and engineering. 相似文献
68.
《国际计算机数学杂志》2012,89(12):1849-1863
This paper presents a computational procedure for finding eigenvalues of a real matrix based on Alternate Quadrant Interlocking Factorization, a parallel direct method developed by Rao in 1994 for the solution of the general linear system Ax=b. The computational procedure is similar to LR algorithm as studied by Rutishauser in 1958 for finding eigenvalues of a general matrix. After a series of transformations the eigenvalues are obtained from simple 2×2 matrices derived from the main and cross diagonals of the limit matrix. A sufficient condition for the convergence of the computational procedure is proved. Numerical examples are given to demonstrate the method. 相似文献
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