old one is
train : release 1
tune: release 2
test : release 3
new one is (for DE,GridSearch and Naive)
train+tune : release 1+2, and Cross-Evaluation with StratifiedKfold(make data distribution balance for both training and tuning data )
test: release 3
old one is train : release 1 tune: release 2 test : release 3
new one is (for DE,GridSearch and Naive) train+tune : release 1+2, and Cross-Evaluation with StratifiedKfold(make data distribution balance for both training and tuning data ) test: release 3