groupkfold cross validation

data = array([9,5,6,7,8,3])
target=  [1,2,1,2,1,2]
test_groups=[1,1,2,2,2,1]

groupkfold = GroupKFold(n_splits=2)

for training, testing in groupkfold.split(data,target,groups=test_groups):
    print('training: %s, testing: %s' % (data[training], data[testing]))