diff --git a/ppdet/utils/stats.py b/ppdet/utils/stats.py
index b7ae5045124..c070e6544ed 100644
--- a/ppdet/utils/stats.py
+++ b/ppdet/utils/stats.py
@@ -74,7 +74,7 @@ def update(self, stats):
                 for k in stats.keys()
             }
         for k, v in self.meters.items():
-            v.update(stats[k])
+            v.update(float(stats[k]))
 
     def get(self, extras=None):
         stats = collections.OrderedDict()