diff --git a/dygraph/cvlibs/__init__.py b/dygraph/cvlibs/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..4085427caed2dd8ebe15eda343456ca38b8011f6
--- /dev/null
+++ b/dygraph/cvlibs/__init__.py
@@ -0,0 +1,13 @@
+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
diff --git a/dygraph/cvlibs/manager.py b/dygraph/cvlibs/manager.py
index 4d008d66d14eac5334ec8386f73127b2fbcbf20d..eefc44950d5b0ac1cdf51092923c09342df0331b 100644
--- a/dygraph/cvlibs/manager.py
+++ b/dygraph/cvlibs/manager.py
@@ -31,7 +31,7 @@ class ComponentManager:
         >>> print(model_manager.components_dict)
     output: {'AlexNet': <class '__main__.AlexNet'>, 'ResNet': <class '__main__.ResNet'>}
 
-    Or a easier way, using it as a Python decorator, while just add it above the class declaration.
+    Or an easier way, using it as a Python decorator, while just add it above the class declaration.
         >>> model_manager = ComponentManager()
         >>> @model_manager.add_component
         >>> class AlexNet: ...
@@ -55,8 +55,6 @@ class ComponentManager:
             raise KeyError("{} does not exist in the current {}".format(item, self))
         return self._components_dict[item]
 
-    def __contains__(self, item):
-        return self._components_dict.get(item, None) is not None
 
     @property
     def components_dict(self):
@@ -66,36 +64,46 @@ class ComponentManager:
         """
         Add a single component into the corresponding manager
 
-        :param component (class): a new component
-        :return: None
+        Args:
+        component (function | class): a new component
+
+        Returns:
+        None
         """
 
-        # only support a class type
-        if not inspect.isclass(component):
-            raise TypeError("Expect class type, but received {}".format(type(component)))
+        # Currently only support class or function type
+        if not (inspect.isclass(component) or inspect.isfunction(component)):
+            raise TypeError("Expect class/function type, but received {}".format(type(component)))
 
-        # obtain the internal name of the component
+        # Obtain the internal name of the component
         component_name = component.__name__
 
-        # check whether the component was added already
+        # Check whether the component was added already
         if component_name in self._components_dict.keys():
             raise KeyError("{} exists already!".format(component_name))
         else:
-            # take the internal name of the component as its key
+            # Take the internal name of the component as its key
             self._components_dict[component_name] = component
 
     def add_component(self, components):
         """
         Add component(s) into the corresponding manager
 
-        :param components (class | list | tuple): support three types of components
-        :return: None
+        Args:
+        components (function | class | list | tuple): support three types of components
+        
+        Returns:
+        None
         """
-        print(components)
-        # check whether the type is a sequence
+
+        # Check whether the type is a sequence
         if isinstance(components, collections.Sequence):
             for component in components:
                 self._add_single_component(component)
         else:
             component = components
-            self._add_single_component(component)
\ No newline at end of file
+            self._add_single_component(component)
+        
+
+MODELS = ComponentManager()
+BACKBONES = ComponentManager()
\ No newline at end of file