mark attr distance

ge/graph/build/memory/graph_mem_assigner.cc

@@ -36,6 +36,7 @@ namespace {
 const int kAllInputAddrIsAtomic = -1;
 const int kVirtualInputNodeMemoryReuse = 0;
 const int kVirtualOutputNodeMemoryReuse = 1;
+const int kPrevNextDistanceNum = 2;
 const int64_t kInvalidStream = -1;
 const char *const kEngineNameGeLocal = "DNN_VM_GE_LOCAL_OP_STORE";
 // One state per bit cannot be repeated
@@ -1979,7 +1980,7 @@ static void UpdatePrevNodeInputDesc(const NodePtr &prev_node,
       continue;
     }
 
-    if (prev_next_distances.size() == 2) {
+    if (prev_next_distances.size() == kPrevNextDistanceNum) {
       prev_next_distances[1] = distance;
     } else {
       GELOGW("Size of prev_next_distances is not 2.");
@@ -2114,7 +2115,7 @@ void GraphMemoryAssigner::MarkNodeDistanceAttr(const ComputeGraphPtr &compute_gr
           GELOGW("Get ATTR_NAME_DATA_VISIT_DISTANCE failed.");
           continue;
         }
-        if (prev_next_distances.size() != 2) {
+        if (prev_next_distances.size() != kPrevNextDistanceNum) {
           GELOGW("Size of prev_next_distance is not 2.");
           continue;
         } else {