Before running code again, I never knew what the data set named by Val was used for. Later it was found that validation is the abbreviation of validation, and in machine learning validation mainly refers to validation set, that is, validation set. But one openWhen we first come into contact with machine learning, we often hear about training sets and test sets, and then the verification set is used to do what.
There are many blogs in this section, so cite one of them: https://blog.csdn.net/losteng/article/details/50766252
Follow up has its own understanding or example, and then update.