The keyword argument 'normalize' was not expected in the __init__() method of Ridge.

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This error occurs when you pass the argument 'normalize' to the Ridge class constructor (init method), which is not a valid argument for the Ridge class.

The Ridge class has several valid arguments, such as alpha, fit_intercept, solver, etc. but 'normalize' is not one of them.

To resolve this error, simply remove the 'normalize' argument from the Ridge class constructor call. Alternatively, you can use a different class that supports the 'normalize' argument, such as RidgeCV or LassoCV.

Example of incorrect usage:

from sklearn.linear_model import Ridge

model = Ridge(normalize=True)

Example of correct usage:

from sklearn.linear_model import Ridge

model = Ridge(alpha=0.5, fit_intercept=True)

Alternatively, using RidgeCV:

from sklearn.linear_model import RidgeCV

model = RidgeCV(normalize=True)