Update pytorch_graph.py

Add output shape check

mmdnn/conversion/pytorch/pytorch_graph.py

@@ -129,11 +129,12 @@ class PytorchGraph(Graph):
         for node in nodes:
             node_id = PytorchGraph.get_node_id(node)
             node_name = self.rename_nodes(node, node_id)
-            output_shape_str = re.findall(r'[^()!]+', node.__str__())[1]
-            if '%' in output_shape_str:
-                out_put_shape = None
+            output_str = node.__str__().split('=')[0]
+            output_shape_str = re.findall(r'[^()!]+', output_str)
+            if len(output_shape_str) > 1:
+                output_shape = [int(x.replace('!', '')) for x in output_shape_str[1].split(',')]
             else:
-                output_shape = [int(x.replace('!', '')) for x in output_shape_str.split(',')]
+                output_shape = None
             self.shape_dict[node_name] = output_shape
             self.layer_map[node_name] = self.CreateGraphNode(node)
             self.layer_name_map[node_name] = node_name