网格搜索优化

def solve():
    from sklearn.datasets import load_iris
    from sklearn.ensemble import RandomForestClassifier
    from sklearn.model_selection import GridSearchCV
    from sklearn.preprocessing import StandardScaler
    iris = load_iris()
    X = iris.data
    y = iris.target
    params = {'____': [____, ____], '____': [None, ____]}
    grid = GridSearchCV(RandomForestClassifier(____), params, cv=____)
    grid.fit(____)
    print(____)