梯度提升-学习率影响

def solve():
    import pandas as pd
    from sklearn.ensemble import GradientBoostingClassifier
    from sklearn.model_selection import train_test_split
    from sklearn.metrics import accuracy_score
    df = pd.read_csv(____)
    X = df.drop(____)
    y = df['____']
    X_train, X_test, y_train, y_test = train_test_split(____)
    for lr in [____, ____, ____, ____]:
        gb = GradientBoostingClassifier(____)
        gb.fit(____)
        acc = accuracy_score(y_test, gb.predict(____))
        print(____)