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The book mentions and displays the plots:

"If we plot the corresponding output per each regularization parameter from listing 3.5, we can
see how the curve changes as ? increases. When ? is 0, the algorithm favors using the higher
order terms to fit the data. As we start penalizing parameters with a high L2 norm, the cost
decreases, indicating that we are recovering from overfitting.

But it does not show in the listing how to plot.