MachineLearningCh4-Logistic_Regression.pdf

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1、LogisticRegression12NaïveBayesReviewGenerativevs.Discriminative3Classifiers4LogisticRegressionLogisticRegressionisaLinear5Classifier!LogisticRegressionisaLinear6Classifier!LogisticRegressionformore7than2classes8TrainingLogisticRegression9TrainingLogisticRe

2、gressionExpressingConditionalLog10LikelihoodMaximizingConditionalLog11LikelihoodOptimizingconcave/convex12functionGradientAscentforLogistic13Regression14Effectofstep-sizeη15That’sallM(C)LE.HowaboutMAP?16Understandingthesigmoid17Largeweights→Overfitting18M(

3、C)AP-Regularization19M(C)AP-Gradient20M(C)LEvs.M(C)APConnectiontoGaussianNaïve21BayesConnectiontoGaussianNaïve22BayesGaussianNaïveBayesvs.23LogisticRegressionNaïveBayesvs.Logistic24Regression25Generativevs.Discriminative26Generativevs.DiscriminativeNaïveBa

4、yesvs.Logistic27RegressionExperimentalComparison(Ng-28Jordan’01)29Whatyoushouldknow