Fitting Curves
A straight line cannot follow a curve. PolynomialFeatures adds the squared (and higher) versions of each feature so a linear model can bend. A pipeline chains steps, so the same steps run on training data and on new data.
Examplepython
Quick check
What does `PolynomialFeatures(2)` add?
Your turn: write the code
Fit a degree 3 polynomial pipeline to these points and print its score rounded to 3 decimals.
Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.
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