message: Some minor change for internal use.
diff: @@ -70,7 +70,7 @@ void AddCostNode(ReadyNodeManager* node_manager, const OpContext& op_context,
  // All inputs should have been seen already unless this is a Merge node.
  if (name_to_id->find(input_name) == name_to_id->end()) {
  if (!IsMerge(*node_manager->GetCurrNode()))
  - LOG(ERROR) << "input: " << input
  + VLOG(1) << "input: " << input
  << " not found for non-Merge node: " << op_name;
  // For Merge node, some of inputs may not be seen before
  