说明：  根据用户的电影收视率来预测用户的性别和年龄并且使用10折交叉验证。
(predict the gender and age of users based on their ratings on movies.perform 10-fold cross validation. In each fold, users.datx(x=0,…,9) is used for test, and all other users. datxare used for training. You can use movies.dat and ratings.dat in both training and test and in whatever way)