From 24235f44ca75b6611c096b7824da06858134ea4a Mon Sep 17 00:00:00 2001
From: Yi Zhang <zhangyiss@icloud.com>
Date: Thu, 17 Feb 2022 16:47:20 +0800
Subject: [PATCH] tmp update

---
 src/lib/lbfgs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/lib/lbfgs.c b/src/lib/lbfgs.c
index 277a847..12973c2 100644
--- a/src/lib/lbfgs.c
+++ b/src/lib/lbfgs.c
@@ -461,6 +461,7 @@ int lbfgs(
         we assume the initial hessian matrix H_0 as the identity matrix.
      */
     // 初始下降方向为梯度的反方向
+    // LBFGS中下降方向为 -1*H_k*g_k
     if (param.orthantwise_c == 0.) {
         vecncpy(d, g, n); //拷贝数组 并反号（乘-1）
     } else {