Why Scaling is required for K-Nearest-Neighbour

Introduction In this post, we will learn and understand why should we scale a KNN model. Prima-facie it looks like euclidean distance should not get impacted even with unscaled data i.e. $$distance = \sqrt(X_2^2 - X_1^2) + (Y_2^2 - Y_1^2)$$ We can o...