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    基于Epanechnikov混合模型的中心化模糊模型

    A Novel Rule-Centered Fuzzy Model Induced by Epanechnikov Mixtures

    • 摘要: 基于Epanechnikov混合模型提出了一种新的模糊模型——具有多维隶属度函数的规则中心化模糊模型.它容易设计:任何一个Epanechnikov混合模型都唯一对应着一个规则中心化的模糊模型,Epanechnikov混合模型的条件期望输出是规则中心化的模糊模型的去模糊化输出; 它具有高度的可解释性:其规则后件恰好是其输出在规则中心的一阶Taylor级数展开; 它采用了多维隶属度函数,考虑了输入数据各个分量之间的相关性,更符合实际问题.对两个典型实例的仿真实验表明,由Epanechnikov混合模型设计的规则中心化的模糊模型比其他模糊模型速度快、精度高、鲁棒性好.

       

      Abstract: This work explores how mixture model based on Epanechnikov kernel functions, termed here as Epanechnikov mixture model (EMM), can be translated into a rule-centered generalized fuzzy model (RCGFM) with multidimensional Epanechnikov membership functions that take into consideration of the correlation among components of sample data and therefore result in a more effective partition of the input space. Thus, the new fuzzy model can be interpreted probabilistically, i.e., the conditional means of an EMM corresponds to the defuzzified output of a RCGFM and the coefficients represented by the means and/or variances in probability theory in the consequent polynomials of fuzzy rules can be exactly interpreted as Taylor series coefficients. The differential theory is combined with the fuzzy theory. Furthermore, the proposed model yields a smaller number of fuzzy rules and inputs, because the compactly supported polynomial Epanechnikov membership functions minimize the asymptotic mean integrated squared error with the optimal kernel efficiency. As demonstrated by the experimental results in several benchmarking datasets, the EMM linked RCGFM as the fuzzy model EMM-RCGFM is superior to other fuzzy models in modeling accuracy and robustness, besides generating a small set of probabilistically interpretable fuzzy rules. This work represents a very first attempt to exhibit the applicability of Epanechnikov kernel functions as fuzzy membership functions.

       

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