当训练或者计算好一个模型之后,如果别人需要我们提供预测结果,就需要保存模型(主要是保存算法的参数)
from sklearn.externals import joblib
以线性回归的岭回归对boston房价进行预测的案例,进行模型的保存于加载:
代码:
from sklearn.datasets import load_boston
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import StandardScaler
from sklearn.metrics import mean_squared_error
from sklearn.linear_model import Ridge
from sklearn.externals import joblib
(2)编写linear3()函数:
def linear3():
'''
岭回归的方法对波士顿房价进行预测
:return:
'''
# 1.获取数据
boston = load_boston()
# 2.划分数据集
x_train,x_test,y_train,y_test = train_test_split(boston.data, boston.target, random_state= 22)
# 3.特征工程:标准化
transfer = StandardScaler()
x_train = transfer.fit_transform(x_train)
x_test = transfer.transform(x_test)
# 4.预估器流程
estimator = Ridge(alpha=0.5,max_iter=10000)
estimator.fit(x_train,y_train)
# 保存模型
joblib.dump(estimator,"ridge_linear.pkl")
# 5.得出模型
print("岭回归权重系数为:\n",estimator.coef_)
print("岭回归偏置为:\n",estimator.intercept_)
# 6.评估模型
y_predict = estimator.predict(x_test)
#print("岭回归的y_predict为:\n", y_predict)
error = mean_squared_error(y_test,y_predict)
print("岭回归-均方误差为:\n",error)
return None
(1)调用linear3()函数:
if __name__ == "__main__":
# 代码3:岭回归的方法对波士顿房价进行预测
linear3()
到这里,模型就保存好了,下一步就是对保存好的模型进行加载:
def linear3():
'''
岭回归的方法对波士顿房价进行预测
:return:
'''
# 1.获取数据
boston = load_boston()
# 2.划分数据集
x_train,x_test,y_train,y_test = train_test_split(boston.data, boston.target, random_state= 22)
# 3.特征工程:标准化
transfer = StandardScaler()
x_train = transfer.fit_transform(x_train)
x_test = transfer.transform(x_test)
# 4.预估器流程
#estimator = Ridge(alpha=0.5,max_iter=10000)
#estimator.fit(x_train,y_train)
# 保存模型
#joblib.dump(estimator,"ridge_linear.pkl")
# 模型加载
estimator = joblib.load("ridge_linear.pkl")
# 5.得出模型
print("岭回归权重系数为:\n",estimator.coef_)
print("岭回归偏置为:\n",estimator.intercept_)
# 6.评估模型
y_predict = estimator.predict(x_test)
#print("岭回归的y_predict为:\n", y_predict)
error = mean_squared_error(y_test,y_predict)
print("岭回归-均方误差为:\n",error)
return None