modify cnrt syble name:

lite/kernels/mlu/bridges/graph.h

@@ -130,9 +130,10 @@ class Graph {
   }
   void GenOfflineModel(const std::string& name) {
     cnmlModel_t model;
+    const auto& symbol = "subnet0";
     const auto& filename = name + ".offline.cambricon";
-    CNML_CALL(cnmlCreateModel(&model, name.c_str()));
-    CNML_CALL(cnmlAddFusionOpToModel(model, fusion_op_, filename.c_str()));
+    CNML_CALL(cnmlCreateModel(&model, filename.c_str()));
+    CNML_CALL(cnmlAddFusionOpToModel(model, fusion_op_, symbol.c_str()));
     CNML_CALL(cnmlSaveModel(model, filename.c_str()));
     CNML_CALL(cnmlDestroyModel(model));
   }