Introduction to Information Retrieval

Introduction to Information RetrievalLinear classifiers: Discussion• Many common text classifiers are linear classifiers: NaïveBayes, Rocchio, logistic regression, linear support vectormachines etc.• Each method has a different way of selecting the separatinghyperplane – huge differences in performance.• Can we get better performance with more powerful nonlinearclassifiers?• Not in general: A given amount of training data may suffice forestimating a linear boundary, but not for estimating a morecomplex nonlinear boundary.