From 5bc56fc02fee5b638e26444afa2ceb02e1dbf2ea Mon Sep 17 00:00:00 2001
From: bjyb <1091839467@qq.com>
Date: Thu, 21 Sep 2023 13:07:57 +0800
Subject: [PATCH] Update linregr.cpp

---
 src/gausskernel/dbmind/db4ai/executor/gd/linregr.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/gausskernel/dbmind/db4ai/executor/gd/linregr.cpp b/src/gausskernel/dbmind/db4ai/executor/gd/linregr.cpp
index 96e9f1ed3..c208bab2a 100644
--- a/src/gausskernel/dbmind/db4ai/executor/gd/linregr.cpp
+++ b/src/gausskernel/dbmind/db4ai/executor/gd/linregr.cpp
@@ -21,6 +21,15 @@
  * ---------------------------------------------------------------------------------------
  */
 
+/*Linear regression is a regression analysis that uses the least square function called linear
+regression equation to model the relationship between one or more independent variables and dependent 
+variables. Its expression form is y = w'x+e, where e is the normal distribution with the average value of 0.
+In regression analysis, only one independent variable and one dependent variable are included, and the 
+relationship between them can be approximately expressed by a straight line. This regression analysis is 
+called unary linear regression analysis. If regression analysis includes two or more independent variables, 
+and there is a linear relationship between dependent variables and independent variables, it is called 
+multivariate linear regression analysis.*/
+
 #include "db4ai/gd.h"
 
 static void linear_reg_gradients(GradientsConfig *cfg)