我的混淆矩阵显示了一个我无法理解的错误。我想要一个混淆矩阵来显示两个数组之间的混淆，y_pred并且y_test.
import numpy as np
import matplotlib.pyplot as plt
from sklearn.metrics import confusion_matrix, roc_curve, auc
from sklearn.metrics import accuracy_score
import pylab as pl
# Code that fills up two numpy arrays, y_test and y_pred with integers
print y_test.shape
print y_pred.shape
cm = confusion_matrix(y_test,y_pred)
plt.matshow(cm)
plt.title('Confusion matrix')
plt.colorbar()
plt.ylabel('True label')
plt.xlabel('Predicted label')
plt.show()
错误是：
Traceback (most recent call last):
File "C:\work_asaaki\code\test_samme_46_classes_unconfused.py", line 159, in <module>
cm = confusion_matrix(y_test,y_pred)
File "C:\Anaconda\lib\site-packages\sklearn\metrics\metrics.py", line 742, in confusion_matrix
y_type, y_true, y_pred = _check_clf_targets(y_true, y_pred)
File "C:\Anaconda\lib\site-packages\sklearn\metrics\metrics.py", line 115, in _check_clf_targets
"".format(type_true, type_pred))
ValueError: Can't handle mix of multiclass and unknown
错误是什么意思？当我打印出y_pred.shape和y_test.shape时，我得到相同的形状，（318L）。两个数组的值都在 0 到 29 之间。