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基于增量学习支持向量机的音频例子识别与检索 总被引:5,自引:0,他引:5
音频例子识别与检索的主要任务是构造一个良好的分类学习机,而在构造过程中,从含有冗余样本的训练库中选择最佳训练例子、节省学习机的训练时间是构造分类机面临的一个挑战,尤其是对含有大样本训练库音频例子的识别.由于支持向量是支持向量机中的关键例子,提出了增量学习支持向量机训练算法.在这个算法中,训练样本被分成训练子库按批次进行训练,每次训练中,只保留支持向量,去除非支持向量.与普通和减量支持向量机对比的实验表明,算法在显著减少训练时间前提下,取得了良好的识别检索正确率. 相似文献
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在增量学习过程中,随着训练集规模的增大,支持向量机的学习过程需要占用大量内存,寻优速度非常缓慢。在现有的一种支持向量机增量学习算法的基础上,结合并行学习思想,提出了一种分层并行筛选训练样本的支持向量机增量学习算法。理论分析和实验结果表明:与原有的算法相比,新算法能在保证支持向量机的分类能力的前提下显著提高训练速度。 相似文献
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为了解决增量式最小二乘孪生支持向量回归机存在构成的核矩阵无法很好地逼近原核矩阵的问题,提出了一种增量式约简最小二乘孪生支持向量回归机(IRLSTSVR)算法。该算法首先利用约简方法,判定核矩阵列向量之间的相关性,筛选出用于构成核矩阵列向量的样本作为支持向量以降低核矩阵中列向量的相关性,使得构成的核矩阵能够更好地逼近原核矩阵,保证解的稀疏性。然后通过分块矩阵求逆引理高效增量更新逆矩阵,进一步缩短了算法的训练时间。最后在基准测试数据集上验证算法的可行性和有效性。实验结果表明,与现有的代表性算法相比,IRLSTSVR算法能够获得稀疏解和更接近离线算法的泛化性能。 相似文献
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基于核矩阵学习的XML文档相似度量方法 总被引:6,自引:0,他引:6
XML文档作为一种新的数据形式,成为当前的研究热点.XML文档间相似度的计算是XML文档分析、管理及文本挖掘的基础.结构链接向量模型(structuredlink vector model,简称SLVM)是一种综合考虑XML文档结构信息与内容信息进行XML文档相似度量的方法.体现XML文档结构单元关系的核矩阵在结构链接向量模型中扮演着重要角色.为自动捕获XML文档结构单元关系,提出了两种核矩阵的学习算法,分别是基于支持向量机(support vector machine,简称SVM)的回归学习算法和基于矩阵迭代的学习算法.相似搜索实验对比结果表明,基于核矩阵学习方法的XML文档相似度量方法的准确性明显优于其他方法.进一步实验表明,基于矩阵迭代学习的核矩阵学习算法与基于支持向量机的回归学习算法相比,不仅具有更高的准确性,而且所需训练文档更少、计算代价更小. 相似文献
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一种适合于增量学习的支持向量机的快速循环算法 总被引:5,自引:0,他引:5
当样本数量大到计算机内存中放不下时,常规支持向量机方法就失去了学习能力,为了解决这一问题,提高支持向量机的训练速度,文章分析了支持向量机分类的本质特征,根据支持向量机分类仅与支持向量有关的特点,提出了一种适合于支持向量机增量学习的快速循环算法(PFI-SVM),提高了支持向量机的训练速度和大样本学习的能力,而支持向量机的分类能力不受任何影响,取得了较好的效果。 相似文献
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基于统计学习理论的支持向量机的分类方法 总被引:2,自引:5,他引:2
支持向量机是一种新型机器学习方法,由于其出色的学习性能,该技术已成为机器学习领域新的研究热点。介绍用于分类的支持向量机的统计学习理论基础,在此基础上提出了支持向量机的分类算法,讨论了支持向量机存在的问题,对用于分类的支持向量机的应用前景进行了展望。 相似文献
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支持向量机组合分类及其在文本分类中的应用 总被引:3,自引:0,他引:3
针对标准支持向量机对野值点和噪音敏感,分类时明显倾向于大类别的问题,提出了一种同时考虑样本差异和类别差异的双重加权支持向量机。并给出了由近似支持向量机结合支持向量识别算法,识别野值点和计算样本重要性权值的方法.双重加权支持向量机和近似支持向量机组合的新分类算法尤其适用于样本规模大、样本质量不一、类别不平衡的文本分类问题.实验表明新算法改善了分类器的泛化性能。比传统方法具有更高的查准率和查全率. 相似文献
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Support vector machine is a learning technique based on the structural risk minimization principle, and it is also a class of regression method with good generalization ability. The paper firstly introduces the mathematical model of regression least squares support vector machine (LSSVM), and designs incremental learning algorithms by the calculation formula of block matrix, then uses LSSVM to model nonlinear system, based on which to control nonlinear systems by model predictive method. Simulation experiments indicate that the proposed method provides satisfactory performance, and it achieves superior modeling performance to the conventional method based on neural networks, moreover it achieves well control performance. 相似文献
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Pijush Samui Thomas Oommen Terry A. Howell Thomas H. Marek Dana O. Porter 《International journal of remote sensing》2013,34(18):5732-5745
Tillage management practices have a direct impact on water-holding capacity, evaporation, carbon sequestration and water quality. This study examines the feasibility of two statistical learning algorithms, namely the least square support vector machine (LSSVM) and relevance vector machine (RVM), for identifying two contrasting tillage management practices using remote-sensing data. LSSVM is firmly based on statistical learning theory, whereas RVM is a probabilistic model where the training takes place in a Bayesian framework. Input to the LSSVM and RVM algorithms were reflectance values at different bandwidths and indices derived from Landsat Thematic Mapper (TM) data. Ground-truth data for this study were collected from 72 commercial production fields in two counties located in the Texas High Plains of the south-central USA. Numerous LSSVM- and RVM-based tillage models were developed and evaluated for tillage classification accuracy. The percentage correct and kappa statistic were used for the evaluation. The results showed that the best LSSVM and RVM models included the use of TM band 5 or vegetation indices that involved TM band 5, indicating sensitivity of near-infrared reflectance of crop residue cover on the surface. This is consistent with other remote-sensing models reported in the literature. Overall classification accuracies of the best LSSVM and RVM models were 87.8 and 90.2%, respectively. The corresponding kappa statistics for those models were 0.75 and 0.80, respectively. Furthermore, comparison of the best LSSVM and RVM models with the published logistic regression-based tillage models developed with the same data indicated the superiority of the RVM model over LSSVM and logistic regression models in determining contrasting tillage practices with Landsat TM data. 相似文献
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一种实用的火电厂飞灰含碳量软测量建模方法 总被引:1,自引:0,他引:1
提出了同时利用自适应加权融合和最小二乘支持向量机建模的实用新方法。首先,给出了基于小波的自适应加权融合和最小二乘支持向量机算法;其次,将BP神经网络、最小二乘支持向量机和基于小波的自适应加权融合的最小二乘支持向量机算法进行建模精度比较;最后,采用真实火电厂飞灰含碳量数据进行模型验证与预测,仿真结果表明基于小波的自适应加权融合的最小二乘支持向量机算法具有较好的建模精度和实用性。 相似文献
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针对核函数选择对最小二乘支持向量机回归模型泛化性的影响, 提出一种新的基于????- 范数约束的最小二乘支持向量机多核学习算法. 该算法提供了两种求解方法, 均通过两重循环进行求解, 外循环用于更新核函数的权值, 内循环用于求解最小二乘支持向量机的拉格朗日乘数, 充分利用该多核学习算法, 有效提高了最小二乘支持向量机的泛化能力, 而且对惩罚参数的选择具有较强的鲁棒性. 基于单变量和多变量函数的仿真实验表明了所提出算法的有效性.
相似文献16.
This article adopts least square support vector machine (LSSVM) and multivariate adaptive regression spline (MARS) for prediction of lateral load capacity (Q) of pile foundation. LSSVM is firmly based on the theory of statistical learning, uses regression technique. MARS is a nonparametric regression technique that models complex relationships. Diameter of pile (D), depth of pile embedment (L), eccentricity of load (e), and undrained shear strength of soil (S u) have been used as input parameters of LSSVM and MARS. Equations have been presented from the developed MARS and LSSVM. This study also presents a comparative study between the developed MARS and LSSVM. 相似文献
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支持向量机是一种基于结构风险最小化原理的学习技术,也是一种新的具有很好泛化性能的回归方法。目前,如何设计快速有效的回归估计算法仍然是支持向量机实际应用中的问题之一。文中对标准SVM回归估计算法加以改进,提出一种改进的SVM回归估计算法,并从学习速度和回归估计精度两个方面对提出的改进的SVM回归估计算法与标准SVM回归估计算法进行了比较。实验结果表明,在学习速度与回归估计精度之间取折衷时,文中提出的回归估计算法自由度更大。 相似文献
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Chao Liu Peifeng Niu Guoqiang Li Xia You Yunpeng Ma Weiping Zhang 《Neural Processing Letters》2017,45(1):299-318
Heat rate value is considered as one of the most important thermal economic indicators, which determines the economic, efficient and safe operation of steam turbine unit. At the same time, an accurate heat rate forecasting is core task in the optimal operation of steam turbine unit. Recently, least squares support vector machine (LSSVM) is being proved an effective machine learning technique for solving nonlinear regression problem with a small sample set. However, it has also been proved that the prediction precision of LSSVM is highly dependent on its parameters, which are hardly choosing for the LSSVM. In the paper, an improved gravitational search algorithm (AC-GSA) is presented to further enhance optimal performance of GSA, and it is employed to serve as an approach for pre-selecting LSSVM parameters. Then, a novel soft computing method, based on LSSVM and AC-GSA, is therefore proposed to forecast heat rate of a 600 MW supercritical steam turbine unit. It combines the merits of the high accuracy of LSSVM and the fast convergence of GSA in order to build heat rate prediction model and obtain a well-generalized model. Results indicate that the developed AC-GSA–LSSVM model demonstrates better regression precision and generalization capability. 相似文献
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An unbiased LSSVM model for classification and regression 总被引:1,自引:0,他引:1
Hong-Qiao Wang Fu-Chun Sun Yan-Ning Cai Lin-Ge Ding Ning Chen 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2010,14(2):171-180
Aiming at the common support vector machine’s biased disadvantage and computational complexity, an unbiased least squares
support vector machine (LSSVM) model is proposed in this paper. The model eliminates the bias item of LSSVM by improving the
form of structure risk, then the unbiased least squares support vector classifier and the unbiased least squares support vector
regression are deduced. Based on this model, we design a new learning algorithm using Cholesky factorization according to
the characteristic of kernel function matrix, in this way the calculation of Lagrangian multipliers is greatly simplified.
Several experiments on diffenert datasets are carried out, including the common datasets classification, synthetic aperture
radar image automatic target recognition and chaotic time series prediction. The experimental results of correct recognition
rate and the fitting precision testify that the unbiased LSSVM model has good universal ability and fitting accuracy, better
generalization capability and stability, and have a great improvement in learning speed. 相似文献
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The least squares support vector machine (LSSVM), like standard support vector machine (SVM) which is based on structural
risk minimization, can be obtained by solving a simpler optimization problem than that in SVM. However, local structure information
of data samples, especially intrinsic manifold structure, is not taken full consideration in LSSVM. To address this problem
and inspired by manifold learning technique, we propose a novel iterative least squares classifier, coined optimal locality
preserving least squares support vector machine (OLP-LSSVM). The idea is to combine structural risk minimization and locality
preserving criterion in a unified framework to take advantage of the manifold structure of data samples to enhance LSSVM.
Furthermore, inspired by the recent development of simultaneous optimization technique, adjacent graph of locality preserving
criterion is optimized simultaneously to give rise to improved discriminative performance. The resulting model can be solved
by alternating optimization method. The experimental results on several publicly available benchmark data sets show the feasibility
and effectiveness of the proposed method. 相似文献