can multiple validation samples be used together can you use different validations what is cross validation which type of data do data set have to be replicated during cross validation? what is the purpose of cross validation is it possible to cross validate data can you use cross validation to test multiple valid samples what is cross validation used for how to cross validate data with multiple sets what is the purpose of cross validation why do we call the following procedure 'cross validation'? what is a cross validation why does cross data validation happen what is used for the validation of a data set can multiple validation samples be used why is cross validation called a cross validation? if data sets rotate when training, can the training set act as validation what validation procedure can you call a single dataset can a validation sample be used for rn validation define cross validation