if (op->getName().getDialectNamespace() !=
        TF::TensorFlowDialect::getDialectNamespace())
      return failure();

    // Refining types may have implications to the attached regions or symbol
    // references so do not update such ops.
    if (!op->getRegions().empty() || HasSymbolRefAttr(op)) return failure();

    IRMapping mapper;
    bool has_type_change = false;