27.2 Classification Method
https://en.wikipedia.org/wiki/Category:Classification_algorithms
27.2.2 KNN
Large margin nearest neighbor https://en.wikipedia.org/wiki/Large_margin_nearest_neighbor
27.2.8 Neighborhood components analysis (NCA)
https://en.wikipedia.org/wiki/Neighbourhood_components_analysis
27.2.9 Soft independent modelling of class analogies
https://en.wikipedia.org/wiki/Soft_independent_modelling_of_class_analogies