交叉验证

def solve():
    import pandas as pd
    import numpy as np
    from sklearn.linear_model import LinearRegression
    from sklearn.model_selection import cross_val_score
    df = pd.read_csv(____)
    X = df[['____', '____', '____']]
    y = df['____']
    model = LinearRegression()
    scores = cross_val_score(____)
    print(____)