Problem with the creation of confusion matix

The given code to return a confusion matrix for the MNIST dataset
y_train_pred = cross_val_predict(sgd_clf, X_train_scaled, y_train, cv=3)
conf_mx = confusion_matrix(y_train, y_train_pred.ravel())
print(conf_mx)

gives the error:
TypeError: 'numpy.ndarray' object is not callable

Does anyone know why?

Start by reproducing the MNIST code shown in the issue, including the cross_val_predict and confusion_matrix calls, and inspect the relevant notebook cell and imported functions. Determine why the reported ndarray call error occurs and document a reproducible correction or clarification for the example.

Written by the indexing model from the issue text.