def linear_model_main(xx,yy):

   regr = linear_model.LinearRegression()

   regr.fit(xx,yy)

   predictions = {}

   predictions['intercept']        = regr.intercept_          #截距

   predictions['coefficient']      = regr.coef_               #系数

   predictions['predicted_values'] = regr.predict(xx)         #预测值

   predictions['corrcoef']         = np.corrcoef(xx,yy)       #相关系数

   return predictions