Using the testing dataset we used in this chapter and the functions you wrote in the previous question (knn_edf, local_reg_edf, and kernel_reg_edf), plot the testing error of all three estimators as a...

Using the testing dataset we used in this chapter and the functions you wrote in the previous question (knn_edf, local_reg_edf, and kernel_reg_edf), plot the testing error of all three estimators as a function of the effective degrees of freedom. What do you observe about their performance on this scale?