train_test_split 直接划分
StratifiedShuffleSplit 根据y标签分类划分
sk-learn中StratifiedShuffleSplit（）函数 实现对数据集的划分_liguandong-CSDN博客_stratifiedshufflesplit
cross_val_score
3.1. Cross-validation: evaluating estimator performance — scikit-learn 1.0.1 documentation
scoreing 的选择
3.3. Metrics and scoring: quantifying the quality of predictions — scikit-learn 1.0.1 documentation