Merge pull request opencv#18027 from dkurt:dnn_backport_ngraph

Author: alalek

modules/dnn/src/ie_ngraph.cpp

@@ -109,6 +109,12 @@ class NgraphCustomOp: public ngraph::op::Op {
         }
     }
 
+#if INF_ENGINE_VER_MAJOR_GE(INF_ENGINE_RELEASE_2020_4)
+    std::shared_ptr<ngraph::Node> clone_with_new_inputs(const ngraph::OutputVector& new_args) const override
+    {
+        return std::make_shared<NgraphCustomOp>(new_args, params);
+    }
+#else
     std::shared_ptr<ngraph::Node> copy_with_new_args(const ngraph::NodeVector& new_args) const override
     {
 #if INF_ENGINE_VER_MAJOR_GE(INF_ENGINE_RELEASE_2020_3)
@@ -117,6 +123,7 @@ class NgraphCustomOp: public ngraph::op::Op {
         return std::make_shared<NgraphCustomOp>(new_args, params);
 #endif
     }
+#endif
 
     bool visit_attributes(ngraph::AttributeVisitor& visitor) override
     {
@@ -380,7 +387,11 @@ void InfEngineNgraphNet::setNodePtr(std::shared_ptr<ngraph::Node>* ptr) {
 
  void InfEngineNgraphNet::release() {
      for (auto& node : components.back()) {
+#if INF_ENGINE_VER_MAJOR_GT(INF_ENGINE_RELEASE_2020_4)
+         if (!(ngraph::op::is_parameter(node) || ngraph::op::is_output(node) || ngraph::op::is_constant(node)) ) {
+#else
          if (!(node->is_parameter() || node->is_output() || node->is_constant()) ) {
+#endif
              auto it = all_nodes.find(node->get_friendly_name());
              if (it != all_nodes.end()) {
                  unconnectedNodes.erase(*(it->second));
@@ -447,11 +458,19 @@ void InfEngineNgraphNet::createNet(Target targetId) {
                 ngraph::ResultVector outputs;
                 ngraph::ParameterVector inps;
                 for (auto& node : components.back()) {
+#if INF_ENGINE_VER_MAJOR_GT(INF_ENGINE_RELEASE_2020_4)
+                    if (ngraph::op::is_parameter(node)) {
+#else
                     if (node->is_parameter()) {
+#endif
                         auto parameter = std::dynamic_pointer_cast<ngraph::op::Parameter>(node);
                         inps.push_back(parameter);
                     }
+#if INF_ENGINE_VER_MAJOR_GT(INF_ENGINE_RELEASE_2020_4)
+                    else if (ngraph::op::is_output(node)) {
+#else
                     else if (node->is_output()) {
+#endif
                         auto result = std::dynamic_pointer_cast<ngraph::op::Result>(node);
                         outputs.push_back(result);
                     }