message: [tf.data] Fixing an error in the optimization loop.
diff: @@ -322,7 +322,7 @@ void Model::Optimize(int64 cpu_budget) {
  }
  tunable->value--;
  }
  - if (best_tunable) {
  + if (!best_tunable) {
  // NOTE: This can happen because we are performing the optimization
  // while the model data is changing. If this becomes an issue, we should
  // look into performing the optimization using a model snapshot.
  