Figure 3.

Mean values of normalized root mean squared errors and SD for Ridge Regression (A) and Ridge Regression with Random Fourier features (B). Numbers 1–5 on the x-axes are in turn 10-fold cross-validation with shuffling using all values, 10-fold cross-validation with shuffling using only on–off values, On–off values for training and then predict the intermediate values, 5-fold cross-validation without shuffling using all values, and 5-fold cross-validation without shuffling training with on–off and predict all values.