早停防止过拟合（回归）

from sklearn.datasets import fetch_california_housing
from sklearn.neural_network import MLPRegressor
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import StandardScaler
from sklearn.metrics import r2_score
housing = fetch_california_housing()
X_train, X_test, y_train, y_test = train_test_split(____)
scaler = StandardScaler()
X_train = scaler.fit_transform(____)
X_test = scaler.transform(____)
reg = MLPRegressor(hidden_layer_sizes=(____,), max_iter=____, early_stopping=True, random_state=____)
reg.fit(____)
print(____)