为什么我定义了X_train程序运行时却显示X_train没有被声明？
我尝试过输出X_train程序可以正常输出，但当运行这整段代码时却显示NameError: name 'X_train' is not defined
def hr_modeling(features,label):
from sklearn.model_selection import train_test_split
f_v=features.values
l_v=label.values
#区分验证集
X_tt,X_validation,Y_tt,Y_validation = train_test_split(f_v,l_v,test_size=0.2)
#区分训练集和测试集
X_train,X_test,Y_train,Y_test=train_test_split(X_tt,Y_tt,test_size=0.25)
print(len(X_train),len(X_validation),len(X_test))
print(X_train)
from sklearn.neighbors import NearestNeighbors,KNeighborsClassifier
knn_clf=KNeighborsClassifier(n_neighbors=5)
knn_clf.fit(X_train,Y_train)
Y_pred=knn_clf.predict(X_validation)
from sklearn.metrics import accuracy_score,recall_score,f1_score
print('ACC:',accuracy_score(Y_validation,Y_pred))
print('REC:',recall_score(Y_validation,Y_pred))
print('F-Score:',f1_score(Y_validation,Y_pred))
def main():
hr_modeling(features,label)
if __name__=='__main__':
main()
