看不到代码行中有什么无效语法

Question

我不明白该特定代码行的语法错误是什么。

print("pred is equal to predictions: {}".format(np.all(pred == 
gbrt.predict(X_test))))
decision_function = gbrt.decision_function(X_test)
print("Decision function minimum: {:.2f} maximum: {:.2f}".format(
        np.min(decision_function), np.max(decision_function)))
X_test.shape: (25, 2)
Decision function shape: (25,)
Decision function:

File "<ipython-input-17-1457aa7b42c8>", line 34
    Decision function shape: (25,)
                ^
SyntaxError: invalid syntax