Figure 13.

Learning curves for 5-fold cross-validation of three models (with the best performance on three different time windows) on the three-axis acceleration and gyroscope data training set. (a) Learning curve of stacking by 5-fold cross-validation on 3 s time window; (b) learning curve of ELM by 5-fold cross-validation on 5 s time window; (c) learning curve of ELM by 5-fold cross-validation on 11 s time window.