replace DeprecationWarning with UserWarning (#353)

mmcv/utils/registry.py

@@ -63,8 +63,7 @@ class Registry:
         warnings.warn(
             'The old API of register_module(module, force=False) '
             'is deprecated and will be removed, please use the new API '
-            'register_module(name=None, force=False, module=None) instead.',
-            DeprecationWarning)
+            'register_module(name=None, force=False, module=None) instead.')
         if cls is None:
             return partial(self.deprecated_register_module, force=force)
         self._register_module(cls, force=force)

tests/test_registry.py

@@ -82,15 +82,15 @@ def test_registry():
             pass
 
     # begin: test old APIs
-    with pytest.warns(DeprecationWarning):
+    with pytest.warns(UserWarning):
         CATS.register_module(SphynxCat)
         assert CATS.get('SphynxCat').__name__ == 'SphynxCat'
 
-    with pytest.warns(DeprecationWarning):
+    with pytest.warns(UserWarning):
         CATS.register_module(SphynxCat, force=True)
         assert CATS.get('SphynxCat').__name__ == 'SphynxCat'
 
-    with pytest.warns(DeprecationWarning):
+    with pytest.warns(UserWarning):
 
         @CATS.register_module
         class NewCat:
@@ -98,11 +98,11 @@ def test_registry():
 
         assert CATS.get('NewCat').__name__ == 'NewCat'
 
-    with pytest.warns(DeprecationWarning):
+    with pytest.warns(UserWarning):
         CATS.deprecated_register_module(SphynxCat, force=True)
         assert CATS.get('SphynxCat').__name__ == 'SphynxCat'
 
-    with pytest.warns(DeprecationWarning):
+    with pytest.warns(UserWarning):
 
         @CATS.deprecated_register_module
         class CuteCat:
@@ -110,7 +110,7 @@ def test_registry():
 
         assert CATS.get('CuteCat').__name__ == 'CuteCat'
 
-    with pytest.warns(DeprecationWarning):
+    with pytest.warns(UserWarning):
 
         @CATS.deprecated_register_module(force=True)
         class NewCat2: