diff --git a/megnet/models.py b/megnet/models.py
index 712efab85..4db7215d3 100644
--- a/megnet/models.py
+++ b/megnet/models.py
@@ -150,10 +150,24 @@ def predict_structure(self, structure):
             structure: pymatgen structure or molecule
 
         Returns:
-            batch generator object
+            predicted target value
         """
-        inp = self.graph_convertor.get_input(structure)
-        return self.target_scaler.inverse_transform(self.predict(inp).ravel(), len(structure))
+        graph = self.graph_convertor.convert(structure)
+        return self.predict_graph(graph)
+
+    def predict_graph(self, graph):
+        """
+        Predict property from graph
+
+        Args:
+            graph: a graph dictionary, see megnet.data.graph
+
+        Returns:
+            predicted target value
+
+        """
+        inp = self.graph_convertor.graph_to_input(graph)
+        return self.target_scaler.inverse_transform(self.predict(inp).ravel(), len(graph['atom']))
 
     def _create_generator(self, *args, **kwargs):
         if hasattr(self.graph_convertor, 'bond_convertor'):