added updates for reattach function

src/operator/subgraph/build_subgraph.cc

@@ -554,6 +554,7 @@ void FindOutputEntries(nnvm::Graph* g,
  */
 void CutGraphInputs(const std::vector<nnvm::NodeEntry*> &input_entries,
                     std::vector<nnvm::NodeEntry> *orig_entries,
+                    std::vector<nnvm::NodeEntry> *all_entries,
                     const bool skip_var = false) {
   // map for creating unique var nodes for deduplicating entries from the same node
   std::unordered_map<std::string,  nnvm::NodeEntry> name_count_map;
@@ -584,7 +585,9 @@ void CutGraphInputs(const std::vector<nnvm::NodeEntry*> &input_entries,
 
       // store the node in the map
       name_count_map.emplace(var_name, e_);
-    }
+    } 
+    all_entries->push_back(*e);
+
     // lookup the name of the node and set it as the input dependency
     *e = name_count_map[var_name];
   }
@@ -618,8 +621,11 @@ void CreateSubgraphNode(nnvm::Graph* g,
 #endif
   std::vector<nnvm::NodeEntry*> input_entries;
   FindInputEntries(*g, simple_nodes, subgraph_nodes, *entry_top_order_map, &input_entries);
+  // deduplicated array of inputs to connect to subgraph
   std::vector<nnvm::NodeEntry> orig_input_entries;
-  CutGraphInputs(input_entries, &orig_input_entries, false);
+  // all original input connections, used to reattach subgraph inputs 
+  std::vector<nnvm::NodeEntry> all_input_entries;
+  CutGraphInputs(input_entries, &orig_input_entries, &all_input_entries, false);
 #if DEBUG_SUBGRAPH
   PrintNodeEntries(input_entries);
   LOG(INFO) << "Searching for output entries...";
@@ -661,7 +667,7 @@ void CreateSubgraphNode(nnvm::Graph* g,
       }
     }
   } else {
-    ReattachGraphInputs(input_entries, &orig_input_entries);
+    ReattachGraphInputs(input_entries, &all_input_entries);
   }
 #if DEBUG_SUBGRAPH
   if (n)