sklearn 随机划分训练集和测试集函数train_test_split

train_test_split是交叉验证中经常使用的函数,功能是从样本中随机的按比例选取train data和testdata,形式为:python X_train,X_test, y_train, y_test =数组 cross_validation.train_test_split(train_data,train_target,test_size=0.4, random_state=0)
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