Fix broken serialize and deserialize for Sum and Product (#4050)

src/ngraph/serializer.cpp

@@ -2386,11 +2386,16 @@ shared_ptr<Node> JSONDeserializer::deserialize_node(json node_js)
         }
         case OP_TYPEID::Product:
         {
-            auto reduction_axes = deserialize_axis_set(node_js.at("reduction_axes"));
+            set<size_t> reduction_axes =
+                get_or_default<set<size_t>>(node_js, "reduction_axes", set<size_t>());
             if (reduction_axes.empty())
+            {
                 node = make_shared<op::v0::Product>(args[0], args[1]);
+            }
             else
+            {
                 node = make_shared<op::v0::Product>(args[0], reduction_axes);
+            }
             break;
         }
         case OP_TYPEID::ReduceProd_v1:
@@ -2807,11 +2812,16 @@ shared_ptr<Node> JSONDeserializer::deserialize_node(json node_js)
         }
         case OP_TYPEID::Sum:
         {
-            auto reduction_axes = deserialize_axis_set(node_js.at("reduction_axes"));
+            set<size_t> reduction_axes =
+                get_or_default<set<size_t>>(node_js, "reduction_axes", set<size_t>());
             if (reduction_axes.empty())
+            {
                 node = make_shared<op::v0::Sum>(args[0], args[1]);
+            }
             else
+            {
                 node = make_shared<op::v0::Sum>(args[0], reduction_axes);
+            }
             break;
         }
         case OP_TYPEID::Tan:
@@ -4202,7 +4212,11 @@ json JSONSerializer::serialize_node(const Node& n)
     }
     case OP_TYPEID::PRelu: { break;
     }
-    case OP_TYPEID::Product: { break;
+    case OP_TYPEID::Product:
+    {
+        auto tmp = static_cast<const op::Product*>(&n);
+        node["reduction_axes"] = tmp->get_reduction_axes();
+        break;
     }
     case OP_TYPEID::ReduceProd_v1:
     {
@@ -4480,7 +4494,11 @@ json JSONSerializer::serialize_node(const Node& n)
         }
         break;
     }
-    case OP_TYPEID::Sum: { break;
+    case OP_TYPEID::Sum:
+    {
+        auto tmp = static_cast<const op::Sum*>(&n);
+        node["reduction_axes"] = tmp->get_reduction_axes();
+        break;
     }
     case OP_TYPEID::ReduceSum_v1:
     {