np.log1p &check_random_state(seed)

1.np.log1p：https://blog.csdn.net/qq_36523839/article/details/82422865（数据平滑处理）

2. check_random_state(seed):
   parameters:seed :
   None | int | instance of RandomState
   If seed is None, return the RandomState singleton used by np.random. If seed is an int, return a new RandomState instance seeded with seed. If seed is already a RandomState instance, return it. Otherwise raise ValueError.