交叉验证

def solve():
    from sklearn.datasets import load_diabetes
    from sklearn.linear_model import LinearRegression
    from sklearn.model_selection import cross_val_score, KFold
    import numpy as np
    diabetes = load_diabetes()
    X, y = diabetes.data, diabetes.target
    model = LinearRegression()
    kf = KFold(____)
    scores = cross_val_score(____)
    print(____)
    print(____)
    print(____)