Bugfix: support unknown while op subgraph

ge/hybrid/model/hybrid_model_builder.cc

@@ -670,6 +670,7 @@ Status HybridModelBuilder::UnfoldSubgraphs(ComputeGraphPtr &root_graph, ComputeG
     GE_CHK_GRAPH_STATUS_RET(merged_graph->AddSubgraph(remained_subgraph),
                             "Failed to add subgraph [%s]",
                             remained_subgraph->GetName().c_str());
+    remained_subgraph->SetParentGraph(merged_graph);
   }
 
   return SUCCESS;
@@ -709,7 +710,7 @@ Status HybridModelBuilder::UnfoldSubgraph(ComputeGraphPtr &root_graph,
       for (size_t i = 0; i < sub_node->GetOpDesc()->GetSubgraphInstanceNames().size(); ++i) {
         auto sub_sub_graph = NodeUtils::GetSubgraph(*sub_node, i);
         GE_CHECK_NOTNULL(sub_sub_graph);
-        sub_sub_graph->SetParentGraph(root_graph);
+        sub_sub_graph->SetParentGraph(parent_graph);
       }
     }
 
@@ -718,7 +719,7 @@ Status HybridModelBuilder::UnfoldSubgraph(ComputeGraphPtr &root_graph,
            sub_graph.GetName().c_str(),
            sub_node->GetName().c_str(),
            parent_graph->GetName().c_str());
-    sub_node->SetOwnerComputeGraph(root_graph);
+    sub_node->SetOwnerComputeGraph(parent_graph);
   }
 
   GELOGD("[%s] Done merging subgraph. remove it from root graph.", sub_graph.GetName().c_str());