from sklearn.neighbors import KNeighborsClassifier
clf = KNeighborsClassifier()
clf.fit(x_train,y_train)
Traceback (most recent call last):
File "<pyshell#2>", line 1, in <module>
clf.fit(x_train,y_train)
NameError: name 'x_train' is not defined
出现错误后我尝试过重新安装sklearn模块,可是还没有解决