SMOTE is a wonderful function in R. It belongs to the package DMwR. It does something very unique. It helps in filling under balanced classes. If your data is imbalanced, SMOTE helps generate more examples of the imbalanced class using a argument specified value based nearest neighbors. There’s one catch though. It cannot work with multi class data. It works only with two classes. You will need to do some special data transformations to smote it.
Try testing your multi class data with the below syntax;
train_cl1s<-SMOTE(V1 ~ ., train_cl1, perc.over = 1500, perc.under = 0, k=11)
now try to check the resultant data frame. It will consist only of one class and not more than it as SMOTE recognizes only two classes.
BIdesi 