From 78d997a870f41b121745c5b4abd41e5e4a048a55 Mon Sep 17 00:00:00 2001
From: guguguzi <48168743+guguguzi@users.noreply.github.com>
Date: Tue, 19 Apr 2022 15:48:45 +0800
Subject: [PATCH] fix bug for MultiplicativeDecay (#41850)

* fix bug for MultiplicativeDecay

* remove changes to test_lr_scheduler.py
---
 python/paddle/optimizer/lr.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/python/paddle/optimizer/lr.py b/python/paddle/optimizer/lr.py
index d0d5eef03c4..ea4349bc0b2 100644
--- a/python/paddle/optimizer/lr.py
+++ b/python/paddle/optimizer/lr.py
@@ -1587,7 +1587,7 @@ class MultiplicativeDecay(LRScheduler):
                                                   verbose)
 
     def get_lr(self):
-        if self.last_epoch > 0:
-            return self.last_lr * self.lr_lambda(self.last_epoch)
-        else:
-            return self.base_lr
+        cur_lr = self.base_lr
+        for epoch in range(1, self.last_epoch + 1):
+            cur_lr = cur_lr * self.lr_lambda(epoch)
+        return cur_lr
-- 
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