下面的一段python程序是使用支持向量机在iris数据集上进行训练的例子,请补全导入的模块名称(用小写字母)from sklearn import cross_validation from sklearn import from sklearn import datasets iris = datasets.load_iris() X_train, X_test, y_train, y_test = cross_validation.train_test_split\(iris.data, iris.target, test_size=0.2 )clf = svm.SVC(kernel='linear', C=1).fit(X_train, y_train)