Some of the code for the operation in the article was not found. Where is the code for this part of the operation?

Hello, the cross-validation method used in this paper is to use 1-Kold as the training set and the rest as the test set. I want to know that if "For test, train in kfold. Split (train_images, train_labels)" indicates the above operation?  Thank you. Looking forward to your reply.
 