plt.subplot(2, 2, 2) plt.plot(X_test, f(X_test), "b") plt.scatter(X_train, y_train, c="b", s=20) plt.plot(X_test, bdt_predict, "y", lw=2) plt.title("Bagging for Trees, MSE = %.2f" % np.sum((y_test - bdt_predict) ** 2))；
