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Subspaces of FM~mlet transform 总被引:3,自引:0,他引:3
The subspaces of FMmlet transform are investigated. It is shown that some of the existing transforms like the Fourier transform, short-time Fourier transform, Gabor transform, wavelet transform, chirplet transform, the mean of signal, and the FM-1let transform, and the butterfly subspace are all special cases of FMmlet transform. Therefore the FMmlet transform is more flexible for delineating both the linear and nonlinear time-varying structures of a signal. 相似文献
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最小平方误差算法的正则化核形式 总被引:2,自引:0,他引:2
最小平方误差算法是最常用的一种经典模式识别和回归分析方法,其目标是使线性函
数输出与期望输出的误差平方和为最小.该文应用满足Meteer条件的核函数和正则化技术,改
造经典的最小平方误差算法,提出了基于核函数和正则化技术的非线性最小平方误差算法,即
最小平方误差算法的正则化核形式,其目标函数包含基于核的非线性函数的输出与期望输出的
误差平方和,及一个适当的正则项.正则化技术可以处理病态问题,同时可以减小解空间和控制
解的推广性,文中采用了三种平方型的正则项,并且根据正则项的概率解释,详细比较了三种正
则项之间的差别.最后,用仿真资料和实际资料进一步分析算法的性能. 相似文献
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Thestudyonapproximationtheoryoffuzzysystemsisveryimportantandnecessary.Inmostapplicationsoffuzzysystems,themaindesignobjectivecanbetransformedtofinddesiredmappingsfromtheinputspacetotheoutputspacewhichmayalsobedenotedasfunctions.Thus,theproblemsofdesig… 相似文献
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基于信息Agent通知站点内容的有价值变化 总被引:1,自引:0,他引:1
Personal Infromation Agent can provide interesting URL to the user. Based on Multi-Agentscollaboration,we can improve the recommendation quality. The Web's interesting change may be valu-able to the user. If a user visits the unchanged URL,it can be burdensome and wasteful. The Notifica-tion Agent can notify that some modification occurred. But the user may not want to know when the au-thor changed the font. We like an Agent that notices when interesting changes occurred. The informa-tioin Agent can use machine learning to detect interesting changes of URLs. According to the user'sfeedback, the Agent will take supervised learning. By propagating interesting changes, the Agent cantake collaboration filtering and improve the detection quality. 相似文献
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提出利用MDS(Multidimensional Scaling)变换聚类算法提取数字电视用户的收视特征,解决了传统聚类算法因中间聚类中心无距离度量而无法应用的问题.基于实际运行的有线数字电视系统,建立了由时间、频道、节目主类别、节目子类别表述的节目特征模型及节目差异模型;提出了基于MDS聚类算法提取用户收视特征的具体步骤;基于实际用户收视记录的计算结果具有特征一致性,以提取特征为基准的节目推荐结果与用户实际的收视记录比对,具有70%准确性. 相似文献