message: Add a comment to the constraint of "inference-only" to note it will eventually be removed, if we enabled this fusion for training in the future.
diff: @@ -912,6 +912,8 @@ class MklLayoutRewritePass : public GraphOptimizationPass {
  // Check if has out control edge. If true, this is a training graph.
  // Currently we focus on inference and do no fusion in training.
  + // Note: this constraint will eventually be removed, if we enabled this fusion for training
  + // in the future.
  for (const Edge* e : node->out_edges()) {
  if (e->IsControlEdge()) {
  return false;
  