fix broken unit tests

Author: icywang86rui

tests/conftest.py

@@ -125,8 +125,7 @@ def sklearn_version(request):
 
 @pytest.fixture(scope='module', params=['1.4', '1.4.1', '1.5', '1.5.0', '1.6', '1.6.0',
                                         '1.7', '1.7.0', '1.8', '1.8.0', '1.9', '1.9.0',
-                                        '1.10', '1.10.0', '1.11', '1.11.0', '1.12', '1.12.0',
-                                        '1.13', '1.13.1'])
+                                        '1.10', '1.10.0', '1.11', '1.11.0', '1.12', '1.12.0'])
 def tf_version(request):
     return request.param