如何转换熊猫.core.series.序列类型到二维数组?

X_train, X_test, y_train, y_test = train_test_split(X_bow, y, test_size=0.30, random_state=42)

y_train= y_train.astype('int')

neigh = KNeighborsClassifier(n_neighbors=3)
neigh.fit(X_train, y_train)

当我尝试测试它时,我得到一个值错误。

pre = neigh.predict(y_test)

Expected 2D array, got 1D array instead:
array=[0. 1. 1. ... 0. 0. 0.].
Reshape your data either using array.reshape(-1, 1) if your data has a 
single feature or array.reshape(1, -1) if it contains a single sample.

我的YU测试是 熊猫.core.series.系列

y_test = pd.DataFrame(y_test)
y_test = y_test.as_matrix().reshape(-1,1)
pre = neigh.predict(y_test)

ValueError: Incompatible dimension for X and Y matrices: X.shape[1] == 1 while Y.shape[1] == 6038