Python ValueError:未知的标签类型：'；未知'；交叉验证

我试图通过交叉验证来划分一些数据集x和y工作正常，但输入时

clf = svm.SVC (kernel = 'linear', C = 1).fit (X_train, y_train) 

它给了我以下错误：

ValueError: Unknown label type: 'unknown'

请帮忙

代码如下：

from sklearn.model_selection import train_test_split
from sklearn import svm

x= sms['spam lda_predict8'.split()]
y=sms.spam

def my_train_test_split(x,y):
    # split data train 70 % and test 30 %
    x_train, x_test, y_train, y_test = train_test_split(x,y,train_size=0.3,random_state=42)
    #normalization
    x_train_N = (x_train-x_train.mean())/(x_train.max()-x_train.min())
    x_test_N = (x_test-x_test.mean())/(x_test.max()-x_test.min())

my_train_test_split(x,y)

clf = svm.SVC(kernel='linear', C=1).fit(X_train, y_train)

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你能发布完整的错误吗？另外，问题似乎是关于标签（y）你能发布你的标签吗？您的标签是否包含任何名为“未知”的标签？