numpy에서 랜덤 숫자
[ https://velog.io/@jhdai_ly/%EB%84%98%ED%8C%8C%EC%9D%B4Numpy%EB%82%9C%EC%88%98%EB%A1%9C-%EB%90%9C-N%EC%B0%A8%EC%9B%90-%EB%B0%B0%EC%97%B4-normal-randn-rand-randint-random.seed ]