enable load with postfix

hapi/model.py

@@ -798,6 +798,13 @@ class Model(fluid.dygraph.Layer):
                     format(key, list(state.shape), list(param.shape)))
             return param, state
 
+	def _strip_postfix(path):
+	    path, ext = os.path.splitext(path)
+	    assert ext in ['', '.pdparams', '.pdopt', '.pdmodel'], \
+		    "Unknown postfix {} from weights".format(ext)
+	    return path
+
+        path = _strip_postfix(path)
         param_state = _load_state_from_path(path + ".pdparams")
         assert param_state, "Failed to load parameters, please check path."