diff --git a/tests/test_pyobj_serialize.py b/tests/test_pyobj_serialize.py
index b19d6cfaab426549b49be134972a25262a31e274..7a9433ea25e07509a215721fdbf710923a38c274 100644
--- a/tests/test_pyobj_serialize.py
+++ b/tests/test_pyobj_serialize.py
@@ -24,6 +24,7 @@ from paddle_hub.logger import logger
 
 def _compare_float(a, b):
     error_value = 1.0e-9
+    logger.debug("a is %f and b is %f" % (a, b))
     # if python version < 3.5
     if sys.version_info < (3, 5):
         return abs(a - b) < error_value