随机森林回归

def solve():
    import pandas as pd
    from sklearn.ensemble import RandomForestRegressor
    from sklearn.model_selection import train_test_split
    df = pd.read_csv(____)
    X = df[['____', '____', '____', '____', '____']]
    y = df['____']
    X_train, X_test, y_train, y_test = train_test_split(____)
    rf = RandomForestRegressor(____).fit(____)
    print(____)