Question about K-Fold Cross Validation
K-fold cross validation only helps you giving an estimation of the error you are going to make with a given model. K-fold can be used in order to tune hyperparameters: we have a model that depends on some hyperparameters, we compute the K-fold validation error using different values of the hyperparameters, and we take the model with the lowest cross-validation error. Finally, we train the model with the chosen hyperparameters with all the training data and we build a classifier based on that model.