X and Y are not defined in preprocessing_surf.py

[hareentej2]

X_train, X_test, X_val, y_train, y_test, y_val = perform_data_split(X, y, training_idxs, test_idxs, val_idxs) Traceback (most recent call last):

File "", line 1, in X_train, X_test, X_val, y_train, y_test, y_val = perform_data_split(X, y, training_idxs, test_idxs, val_idxs)

NameError: name 'X' is not defined

@imRishabhGupta I couldn't find where you defined X and y in this program