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Fig. 3.

image

Fits for linear basis (left panel) and polynomial basis (right panel) for random forests and LASSO. Note that the horizontal lines seen in the fits are there because of decision tree regression: decision trees set one value of the y-axis for a given range of x-axis leading to a step-function like fit. In both cases, LASSO seems to do a better job at capturing the curved shape of the vertical profiles. The black vertical dashed line presents the train-test split (80% training data).

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