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The aim of this study is to review various extensions of the nearest neighbor algorithm and discuss their approach along with limitations of the method. In nonparametric classification, no prior information is required for predicting the class label. k-Nearest Neighbor is the simplest and well known algorithm used in data mining The various extensions of k-nearest neighbor algorithm which have been studied are weighted nearest neighbor, feature selection methods, fuzzy nearest neighbor, genetic algorithm based classifiers and nearest neighbor algorithm using ensembling techniques.

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