diff --git a/python/paddle/distributed/fleet/base/fleet_base.py b/python/paddle/distributed/fleet/base/fleet_base.py
index 2a4977847b1821417ab6ed8cecfa5de5611b7470..178edc0fe88c569a242c630b5b211568109fa49d 100644
--- a/python/paddle/distributed/fleet/base/fleet_base.py
+++ b/python/paddle/distributed/fleet/base/fleet_base.py
@@ -1059,6 +1059,8 @@ class Fleet(object):
         return amp_optimizer
 
     def get_loss_scaling(self):
+        """Return the real-time loss scaling factor.
+        """
         amp_optimizer = self._get_amp_optimizer()
         return amp_optimizer.get_loss_scaling()
 
diff --git a/python/paddle/fluid/contrib/mixed_precision/decorator.py b/python/paddle/fluid/contrib/mixed_precision/decorator.py
index 724f707c2e1f065c63de01e861244f10cf4cf7da..16cba2ce36b20ef2d8b97c046b52a8df64fe0d49 100644
--- a/python/paddle/fluid/contrib/mixed_precision/decorator.py
+++ b/python/paddle/fluid/contrib/mixed_precision/decorator.py
@@ -98,7 +98,7 @@ class OptimizerWithMixedPrecision(object):
     def get_loss_scaling(self):
         """Return the real-time loss scaling factor.
         """
-        assert self._loss_scaling is not None, 'Call minimize() before calling get_loss_scaling()'
+        assert self._loss_scaling is not None, 'Please call minimize() before calling get_loss_scaling().'
         return self._loss_scaling
 
     def get_scaled_loss(self):