随机森林分类

def solve():
    from sklearn.datasets import load_iris
    from sklearn.ensemble import RandomForestClassifier
    import numpy as np
    iris = load_iris()
    X = iris.data
    y = iris.target
    model = RandomForestClassifier(____).fit(____)
    importances = model.feature_importances_
    top_idx = np.argmax(____)
    print(____)