模式识别与人工智能之十一课件.ppt

文档介绍：anizingMap(SOM)AdaptiveResonanceTheory(ART)RelationshipbetweenK-means,workModel-basedclustering(2)worksBiology:anizedinseverallayers:Inputlayer: work;Outputlayer: (s): layersinbetweenoftheinputandoutputlayers,: ordingtheinputs(andoutputsifthelearningissupervised).worksMathematicalExplanationAneuronismodeledmathematicallyasthefollowing:Activation-inputsignal:inputtotheithnodeisaweightedsumofallinputs:Whereistheinputsignalfromthejthnode,:inputWhereisanactivationfunctionwhichcanbeasigmoidfunction,-sided(top)ortwo-sided(bottom):worksMathematicalExplanationOne-sided:Two-sided:whereisaparameterthatcontrolstheslopofSpecially,eslinear,esathresholdfunction:work,similartothestatisticalclusteringanalysismethods(k-means).Thepurposeistodiscovergroups/posedofsimilarpatternsrepresentedbyvectorsinthen-,putationfortheoutput,,input,theactivation,oftheithoutputnodeisjusttheinnerproductoftheweightvectorofthenodeandthecurrentinputvector:workaredeterminedbya``winner-take-all''inputwilloutput1whileallothersoutput0:10