message: Added a comment to explain why we can't reorder BiasAdd
diff: @@ -1486,6 +1486,8 @@ Status ConstantFolding::SimplifyGraph(GraphDef* output,
  // TODO(rmlarsen): Handle non-associative/non-commutative operators like
  // subtraction and division, as well as mixed subtraction/addition,
  // division/multiplication.
  + // Don't touch BiasAdd since they can't handle vectors as their first
  + // inputs.
  if ((IsAdd(*node) || is_mul) && NumNonControlInputs(*node) == 2) {
  NodeDef* left_child = node_map_->GetNode(node->input(0));
  NodeDef* right_child = node_map_->GetNode(node->input(1));
  