add `_load_pretrained_parameters`

hubconf.py

@@ -67,9 +67,12 @@ def _load_pretrained_urls():
 _checkpoints = _load_pretrained_urls()
 
 
-def _load_parameters(model, ):
-    pass
-
+def _load_pretrained_parameters(model, name):
+    assert name in _checkpoints, 'Not provide {} pretrained model.'.format(name)
+    path = paddle.utils.download.get_weights_path_from_url(_checkpoints[name])
+    model.set_state_dict(paddle.load(path))
+    return model
+    
 
 def AlexNet(pretrained=False, **kwargs):
     '''AlexNet