????? ???? ??????? ?? ?? ?? ??? ????? ?? ????? ??????. ????? ??? ??????? ???? ????? ???? ?????? ?????? ????? ?????? ??????????. ??? ?? ?? ?????? ?????? ?????? ????? ?????? ?? ??????? ??????? ?? ???? ?????? ?????? ?????????? ??? ??? ??? ????? ??????. Cross-validation. By splitting the info into ma