// inference for non-tf ops.
  if (!pass_config.quant_specs.serialized_quant_stats.empty()) {
    pass_manager->addNestedPass<mlir::func::FuncOp>(
        mlir::quant::CreateImportQuantStatsPassForTFControlDialect(
            pass_config.quant_specs.serialized_quant_stats));
  }

  pass_manager->addPass(mlir::TF::CreateTFFunctionalControlFlowToRegions());