I hear the dataset is divided into three parts
1-training
2-validation
3-test
in the 2- validation Do you mean cross validation or what difference does it make?
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Many answers on this site already https://stats.stackexchange.com/questions/19048/what-is-the-difference-between-test-set-and-validation-set/96869#96869 – user2974951 Aug 05 '19 at 07:56