共查询到10条相似文献,搜索用时 125 毫秒
1.
Twin support vector machine (TWSVM) is a research hot spot in the field of machine learning in recent years. Although its performance is better than traditional support vector machine (SVM), the kernel selection problem still affects the performance of TWSVM directly. Wavelet analysis has the characteristics of multivariate interpolation and sparse change, and it is suitable for the analysis of local signals and the detection of transient signals. The wavelet kernel function based on wavelet analysis can approximate any nonlinear functions. Based on the wavelet kernel features and the kernel function selection problem, wavelet twin support vector machine (WTWSVM) is proposed by this paper. It introduces the wavelet kernel function into TWSVM to make the combination of wavelet analysis techniques and TWSVM come true. The experimental results indicate that WTWSVM is feasible, and it improves the classification accuracy and generalization ability of TWSVM significantly. 相似文献
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最小二乘Littlewood-Paley小波支持向量机 总被引:11,自引:0,他引:11
基于小波分解理论和支持向量机核函数的条件,提出了一种多维允许支持向量核函数——Littlewood-Paley小波核函数.该核函数不仅具有平移正交性,而且可以以其正交性逼近二次可积空间上的任意曲线,从而提升了支持向量机的泛化性能.在Littlewood-Paley小波函数作为支持向量核函数的基础上,提出了最小二乘Littlewood-Paley小波支持向量机(LS-LPWSVM).实验结果表明,LS-LPWSVM在同等条件下比最小二乘支持向量机的学习精度要高,因而更适用于复杂函数的学习问题. 相似文献
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Volatility forecasting is vital important in finance to reduce risk and take better decisions. This paper proposes a spline
wavelet support vector machine (SWSVM) to forecast the volatility of financial time series based on generalized autoregressive
conditional heteroscedasticity model. An admissible spline wavelet kernel is constructed by incorporating the wavelet technique
and spline theory into support vector machine (SVM). Since spline wavelet function can yield features that describe the stock
time series both at various locations and at varying time granularities, the SWSVM gains the cluster feature of volatility
well. Compared with Gaussian kernel in the standard SVM, the applicability and validity of spline wavelet kernel in SWSVM
are confirmed through computer simulations and experiments on real-world stock data. 相似文献
4.
基于支持向量回归理论和小波支持向量核函数,提出了一种新的SAR滤波方法。首先对支持向量回归方法做了分析,通过对复杂信号进行逼近实验,验证了其应用于图像滤波的可行性和合理性。之后将SAR图像看成是一个二维连续信号,将对复杂信号具有更好逼近能力的小波支持向量核函数用于SAR图像滤波,小波核函数由Morlet小波构建。实验结果表明本文提出的方法能很好的降低SAR图像噪声,而且能比传统方法更好的保持边缘。 相似文献
5.
提出一种基于压缩感知(Compressive sensing, CS)和多分辨分析(Multi-resolution analysis, MRA)的多尺度最小二乘支持向量机(Least squares support vector machine, LS-SVM). 首先将多尺度小波函数作为支持向量核, 推导出多尺度最小二乘支持向量机模型, 然后基于压缩感知理论, 利用最小二乘匹配追踪(Least squares orthogonal matching pursuit, LS-OMP)算法对多尺度最小二乘支持向量机的支持向量进行稀疏化, 最后用稀疏的支持向量实现函数回归. 实验结果表明, 本文方法利用不同尺度小波核逼近信号的不同细节, 而且以比较少的支持向量能达到很好的泛化性能, 大大降低了运算成本, 相比普通最小二乘支持向量机, 具有更优越的表现力. 相似文献
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Wavelet theory has a profound impact on signal processing as it offers a rigorous mathematical framework to the treatment of multiresolution problems. The combination of soft computing and wavelet theory has led to a number of new techniques. On the other hand, as a new generation of learning algorithms, support vector regression (SVR) was developed by Vapnik et al. recently, in which ?-insensitive loss function was defined as a trade-off between the robust loss function of Huber and one that enables sparsity within the SVs. The use of support vector kernel expansion also provides us a potential avenue to represent nonlinear dynamical systems and underpin advanced analysis. However, for the support vector regression with the standard quadratic programming technique, the implementation is computationally expensive and sufficient model sparsity cannot be guaranteed. In this article, from the perspective of model sparsity, the linear programming support vector regression (LP-SVR) with wavelet kernel was proposed, and the connection between LP-SVR with wavelet kernel and wavelet networks was analyzed. In particular, the potential of the LP-SVR for nonlinear dynamical system identification was investigated. 相似文献
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将小波理论和统计学习运用到网络入侵检测中,使用小波核支持向量机(WSVM)对网络连接信息进行攻击检测和异常发现。仿真试验结果表明,与RBF核相比,小波核支持向量机在泛化能力和检测能力方面都有所提高。 相似文献
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