10.19.0 sklearn previous versions have cross_validation package, this time not import StratifiedKFold with model_selection, use cross_validation, 0.20.0 replaced by anything else,
from sklearn.cross_validation import StratifiedKFold
10.19.0 sklearn previous versions have cross_validation package, this time not import StratifiedKFold with model_selection, use cross_validation, 0.20.0 replaced by anything else,
from sklearn.cross_validation import StratifiedKFold