diff --git a/hubconf.py b/hubconf.py
index 84ae3a3edff1089ce6c524c2b790038813e07ccf..eb114bc20d0b7954ec5b8fd3206cfffe5ef0407b 100644
--- a/hubconf.py
+++ b/hubconf.py
@@ -43,8 +43,8 @@ class _SysPathG(object):
 
 with _SysPathG(
         os.path.join(
-            os.path.dirname(os.path.abspath(__file__)), 'ppcls', 'modeling')):
-    import architectures
+            os.path.dirname(os.path.abspath(__file__)), 'ppcls', 'arch')):
+    import backbone
 
     def _load_pretrained_parameters(model, name):
         url = 'https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/{}_pretrained.pdparams'.format(
@@ -63,7 +63,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `AlexNet` model depends on args.
         """
-        model = architectures.AlexNet(**kwargs)
+        model = backbone.AlexNet(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'AlexNet')
 
@@ -80,7 +80,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `VGG11` model depends on args.
         """
-        model = architectures.VGG11(**kwargs)
+        model = backbone.VGG11(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'VGG11')
 
@@ -97,7 +97,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `VGG13` model depends on args.
         """
-        model = architectures.VGG13(**kwargs)
+        model = backbone.VGG13(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'VGG13')
 
@@ -114,7 +114,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `VGG16` model depends on args.
         """
-        model = architectures.VGG16(**kwargs)
+        model = backbone.VGG16(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'VGG16')
 
@@ -131,7 +131,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `VGG19` model depends on args.
         """
-        model = architectures.VGG19(**kwargs)
+        model = backbone.VGG19(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'VGG19')
 
@@ -149,7 +149,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNet18` model depends on args.
         """
-        model = architectures.ResNet18(**kwargs)
+        model = backbone.ResNet18(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNet18')
 
@@ -167,7 +167,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNet34` model depends on args.
         """
-        model = architectures.ResNet34(**kwargs)
+        model = backbone.ResNet34(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNet34')
 
@@ -185,7 +185,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNet50` model depends on args.
         """
-        model = architectures.ResNet50(**kwargs)
+        model = backbone.ResNet50(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNet50')
 
@@ -203,7 +203,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNet101` model depends on args.
         """
-        model = architectures.ResNet101(**kwargs)
+        model = backbone.ResNet101(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNet101')
 
@@ -221,7 +221,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNet152` model depends on args.
         """
-        model = architectures.ResNet152(**kwargs)
+        model = backbone.ResNet152(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNet152')
 
@@ -237,7 +237,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `SqueezeNet1_0` model depends on args.
         """
-        model = architectures.SqueezeNet1_0(**kwargs)
+        model = backbone.SqueezeNet1_0(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'SqueezeNet1_0')
 
@@ -253,7 +253,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `SqueezeNet1_1` model depends on args.
         """
-        model = architectures.SqueezeNet1_1(**kwargs)
+        model = backbone.SqueezeNet1_1(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'SqueezeNet1_1')
 
@@ -271,7 +271,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `DenseNet121` model depends on args.
         """
-        model = architectures.DenseNet121(**kwargs)
+        model = backbone.DenseNet121(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'DenseNet121')
 
@@ -289,7 +289,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `DenseNet161` model depends on args.
         """
-        model = architectures.DenseNet161(**kwargs)
+        model = backbone.DenseNet161(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'DenseNet161')
 
@@ -307,7 +307,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `DenseNet169` model depends on args.
         """
-        model = architectures.DenseNet169(**kwargs)
+        model = backbone.DenseNet169(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'DenseNet169')
 
@@ -325,7 +325,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `DenseNet201` model depends on args.
         """
-        model = architectures.DenseNet201(**kwargs)
+        model = backbone.DenseNet201(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'DenseNet201')
 
@@ -343,7 +343,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `DenseNet264` model depends on args.
         """
-        model = architectures.DenseNet264(**kwargs)
+        model = backbone.DenseNet264(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'DenseNet264')
 
@@ -359,7 +359,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `InceptionV3` model depends on args.
         """
-        model = architectures.InceptionV3(**kwargs)
+        model = backbone.InceptionV3(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'InceptionV3')
 
@@ -375,7 +375,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `InceptionV4` model depends on args.
         """
-        model = architectures.InceptionV4(**kwargs)
+        model = backbone.InceptionV4(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'InceptionV4')
 
@@ -391,7 +391,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `GoogLeNet` model depends on args.
         """
-        model = architectures.GoogLeNet(**kwargs)
+        model = backbone.GoogLeNet(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'GoogLeNet')
 
@@ -407,7 +407,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ShuffleNetV2_x0_25` model depends on args.
         """
-        model = architectures.ShuffleNetV2_x0_25(**kwargs)
+        model = backbone.ShuffleNetV2_x0_25(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ShuffleNetV2_x0_25')
 
@@ -423,7 +423,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV1` model depends on args.
         """
-        model = architectures.MobileNetV1(**kwargs)
+        model = backbone.MobileNetV1(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV1')
 
@@ -439,7 +439,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV1_x0_25` model depends on args.
         """
-        model = architectures.MobileNetV1_x0_25(**kwargs)
+        model = backbone.MobileNetV1_x0_25(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV1_x0_25')
 
@@ -455,7 +455,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV1_x0_5` model depends on args.
         """
-        model = architectures.MobileNetV1_x0_5(**kwargs)
+        model = backbone.MobileNetV1_x0_5(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV1_x0_5')
 
@@ -471,7 +471,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV1_x0_75` model depends on args.
         """
-        model = architectures.MobileNetV1_x0_75(**kwargs)
+        model = backbone.MobileNetV1_x0_75(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV1_x0_75')
 
@@ -487,7 +487,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV2_x0_25` model depends on args.
         """
-        model = architectures.MobileNetV2_x0_25(**kwargs)
+        model = backbone.MobileNetV2_x0_25(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV2_x0_25')
 
@@ -503,7 +503,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV2_x0_5` model depends on args.
         """
-        model = architectures.MobileNetV2_x0_5(**kwargs)
+        model = backbone.MobileNetV2_x0_5(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV2_x0_5')
 
@@ -519,7 +519,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV2_x0_75` model depends on args.
         """
-        model = architectures.MobileNetV2_x0_75(**kwargs)
+        model = backbone.MobileNetV2_x0_75(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV2_x0_75')
 
@@ -535,7 +535,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV2_x1_5` model depends on args.
         """
-        model = architectures.MobileNetV2_x1_5(**kwargs)
+        model = backbone.MobileNetV2_x1_5(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV2_x1_5')
 
@@ -551,7 +551,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV2_x2_0` model depends on args.
         """
-        model = architectures.MobileNetV2_x2_0(**kwargs)
+        model = backbone.MobileNetV2_x2_0(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'MobileNetV2_x2_0')
 
@@ -567,7 +567,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_large_x0_35` model depends on args.
         """
-        model = architectures.MobileNetV3_large_x0_35(**kwargs)
+        model = backbone.MobileNetV3_large_x0_35(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_large_x0_35')
@@ -584,7 +584,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_large_x0_5` model depends on args.
         """
-        model = architectures.MobileNetV3_large_x0_5(**kwargs)
+        model = backbone.MobileNetV3_large_x0_5(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_large_x0_5')
@@ -601,7 +601,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_large_x0_75` model depends on args.
         """
-        model = architectures.MobileNetV3_large_x0_75(**kwargs)
+        model = backbone.MobileNetV3_large_x0_75(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_large_x0_75')
@@ -618,7 +618,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_large_x1_0` model depends on args.
         """
-        model = architectures.MobileNetV3_large_x1_0(**kwargs)
+        model = backbone.MobileNetV3_large_x1_0(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_large_x1_0')
@@ -635,7 +635,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_large_x1_25` model depends on args.
         """
-        model = architectures.MobileNetV3_large_x1_25(**kwargs)
+        model = backbone.MobileNetV3_large_x1_25(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_large_x1_25')
@@ -652,7 +652,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_small_x0_35` model depends on args.
         """
-        model = architectures.MobileNetV3_small_x0_35(**kwargs)
+        model = backbone.MobileNetV3_small_x0_35(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_small_x0_35')
@@ -669,7 +669,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_small_x0_5` model depends on args.
         """
-        model = architectures.MobileNetV3_small_x0_5(**kwargs)
+        model = backbone.MobileNetV3_small_x0_5(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_small_x0_5')
@@ -686,7 +686,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_small_x0_75` model depends on args.
         """
-        model = architectures.MobileNetV3_small_x0_75(**kwargs)
+        model = backbone.MobileNetV3_small_x0_75(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_small_x0_75')
@@ -703,7 +703,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_small_x1_0` model depends on args.
         """
-        model = architectures.MobileNetV3_small_x1_0(**kwargs)
+        model = backbone.MobileNetV3_small_x1_0(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_small_x1_0')
@@ -720,7 +720,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `MobileNetV3_small_x1_25` model depends on args.
         """
-        model = architectures.MobileNetV3_small_x1_25(**kwargs)
+        model = backbone.MobileNetV3_small_x1_25(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model,
                                                 'MobileNetV3_small_x1_25')
@@ -737,7 +737,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNeXt101_32x4d` model depends on args.
         """
-        model = architectures.ResNeXt101_32x4d(**kwargs)
+        model = backbone.ResNeXt101_32x4d(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNeXt101_32x4d')
 
@@ -753,7 +753,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNeXt101_64x4d` model depends on args.
         """
-        model = architectures.ResNeXt101_64x4d(**kwargs)
+        model = backbone.ResNeXt101_64x4d(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNeXt101_64x4d')
 
@@ -769,7 +769,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNeXt152_32x4d` model depends on args.
         """
-        model = architectures.ResNeXt152_32x4d(**kwargs)
+        model = backbone.ResNeXt152_32x4d(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNeXt152_32x4d')
 
@@ -785,7 +785,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNeXt152_64x4d` model depends on args.
         """
-        model = architectures.ResNeXt152_64x4d(**kwargs)
+        model = backbone.ResNeXt152_64x4d(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNeXt152_64x4d')
 
@@ -801,7 +801,7 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNeXt50_32x4d` model depends on args.
         """
-        model = architectures.ResNeXt50_32x4d(**kwargs)
+        model = backbone.ResNeXt50_32x4d(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNeXt50_32x4d')
 
@@ -817,8 +817,24 @@ with _SysPathG(
         Returns:
             model: nn.Layer. Specific `ResNeXt50_64x4d` model depends on args.
         """
-        model = architectures.ResNeXt50_64x4d(**kwargs)
+        model = backbone.ResNeXt50_64x4d(**kwargs)
         if pretrained:
             model = _load_pretrained_parameters(model, 'ResNeXt50_64x4d')
 
         return model
+
+    def darknet53(pretrained=False, **kwargs):
+        """
+        DarkNet53
+        Args:
+            pretrained: bool=False. If `True` load pretrained parameters, `False` otherwise.
+            kwargs: 
+                class_dim: int=1000. Output dim of last fc layer.
+        Returns:
+            model: nn.Layer. Specific `ResNeXt50_64x4d` model depends on args.
+        """
+        model = backbone.DarkNet53(**kwargs)
+        if pretrained:
+            model = _load_pretrained_parameters(model, 'DarkNet53')
+
+        return model