10.2 adaboost regression.py 文件源码

def test_AdaBoostRegressor(*data):
    '''
    test the regression with different number of regression model
    :param data: train_data, test_data, train_value, test_value
    :return:  None
    '''
    X_train,X_test,y_train,y_test=data
    regr=ensemble.AdaBoostRegressor()
    regr.fit(X_train,y_train)
    ## graph
    fig=plt.figure()
    ax=fig.add_subplot(1,1,1)
    estimators_num=len(regr.estimators_)
    X=range(1,estimators_num+1)
    ax.plot(list(X),list(regr.staged_score(X_train,y_train)),label="Traing score")
    ax.plot(list(X),list(regr.staged_score(X_test,y_test)),label="Testing score")
    ax.set_xlabel("estimator num")
    ax.set_ylabel("score")
    ax.legend(loc="best")
    ax.set_title("AdaBoostRegressor")
    plt.show()