用train_test_split進行訓練集和測試集的隨機切分

X_train,X_test, y_train, y_test =sklearn.model_selection.train_test_split(sample_data,sample_target,test_size=0.25, train_size=None,random_state=0,stratify=y_train) train_data:所要劃分的樣本特徵集 train_target:
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