网格搜索调参

def solve():
    from sklearn.datasets import load_iris
    from sklearn.model_selection import GridSearchCV, train_test_split
    from sklearn.ensemble import RandomForestClassifier
    iris = load_iris()
    X_train, X_test, y_train, y_test = train_test_split(____)
    param_grid = {'____': [____, ____, ____], '____': [None, ____, ____], '____': [____, ____]}
    model = RandomForestClassifier(____)
    grid_search = GridSearchCV(____)
    grid_search.fit(____)
    print(____)
    print(____)
    print(____)