Read provenance tags from serialized graph (#3106)

* Add provenance tag support

* Added support to clone the provenance tags to the clone nodes

* Style fix

* Addressed comments

* Guarded the provenance code properly

* Added missing header file

* style

src/ngraph/graph_util.cpp

@@ -233,6 +233,11 @@ std::list<std::shared_ptr<ngraph::Node>>
                 // There is a friendly name for this node so copy it
                 cloned_node->set_friendly_name(node->get_friendly_name());
             }
+
+            for (auto tag : node->get_provenance_tags())
+            {
+                cloned_node->add_provenance_tag(tag);
+            }
             node_map[node.get()] = cloned_node;
         }
     }

src/ngraph/serializer.cpp

@@ -139,6 +139,7 @@
 #include "ngraph/op/tan.hpp"
 #include "ngraph/op/tanh.hpp"
 #include "ngraph/op/topk.hpp"
+#include "ngraph/provenance.hpp"
 #include "ngraph/serializer.hpp"
 #include "ngraph/util.hpp"
 #include "nlohmann/json.hpp"
@@ -1789,6 +1790,14 @@ shared_ptr<Node> JSONDeserializer::deserialize_node(json& node_js)
         {
             node->set_friendly_name(node_name);
         }
+        if (ngraph::get_provenance_enabled())
+        {
+            std::vector<json> prov_js = node_js.at("provenance_tags");
+            for (auto prov_tag : prov_js)
+            {
+                node->add_provenance_tag(prov_tag);
+            }
+        }
         m_node_map[node_name] = node;
     }
     catch (...)
@@ -1900,6 +1909,15 @@ json JSONSerializer::serialize_node(const Node& n)
         }
         node["output_shapes"] = output_shapes;
     }
+    if (ngraph::get_provenance_enabled())
+    {
+        json provenance_tags = json::array();
+        for (auto prov_tag : n.get_provenance_tags())
+        {
+            provenance_tags.push_back(prov_tag);
+        }
+        node["provenance_tags"] = provenance_tags;
+    }
 
     string node_op = n.description();
 #if !(defined(__GNUC__) && (__GNUC__ == 4 && __GNUC_MINOR__ == 8))