NameError: name 'Ridge' is not defined

[shantanuo]

Getting an error while trying to run this code snippet:

model = Ridge()
visualizer = ResidualsPlot(model)
visualizer.fit(X_reg_train, y_reg_train)
visualizer.score(X_reg_test, y_reg_test)
g = visualizer.poof()

[parulnith]

Could you share the screenshot of the error?

[shantanuo]

I do not remember the exact error. But when I initiate a class, I do not see any relevant import. So this statement...

model = Ridge()
visualizer = ResidualsPlot(model)

Will fail. From where do I import these 2 classes?