fix compile

ge/single_op/single_op_model.cc

@@ -482,7 +482,7 @@ Status SingleOpModel::BuildDynamicOp(StreamResource &resource, DynamicSingleOp &
 
   auto ge_model = model_helper_.GetGeModel();
   GE_CHECK_NOTNULL(ge_model);
-  if (ge_model->GetModelTaskDefPtr()->task_num() > 1) {
+  if (ge_model->GetModelTaskDefPtr()->task_size() > 1) {
     GELOGD("Build single op with multiple tasks");
     GE_CHK_STATUS_RET_NOLOG(hybrid::NodeExecutorManager::GetInstance().EnsureInitialized());
     single_op.hybrid_model_.reset(new (std::nothrow)hybrid::HybridModel(model_helper_.GetGeRootModel()));