引入
from sklearn.model_selection import train_test_split
分割（原数据是一个打他frame，先进行切片操作，分开数据和标签）
data_X = data.iloc[:,1:]
data_Y = data.iloc[:,0]
rate_test = 0.2 # 测试集比例
x_train, x_test, y_train, y_test = train_test_split(data_X,
data_Y,
test_size= rate_test)
