See also

• The official documentation of the sklearn.model_selection.cross_val_score function: https://scikit-learn.org/stable/modules/generated/sklearn.model_selection.cross_val_score.html#sklearn.model_selection.cross_val_score
• Cross-validation (from scikit-learn's official documentation): http://ogrisel.github.io/scikit-learn.org/sklearn-tutorial/modules/cross_validation.html