Output max = op.input(2);

  Output s_x = Shape(scope, x);
  Output s_min = Shape(scope, min);
  Output s_max = Shape(scope, max);

  Output min_mask = Less(scope, x, min);
  Output max_mask = Greater(scope, x, max);

  auto r_min = internal::BroadcastGradientArgs(scope, s_x, s_min);
  auto r_max = internal::BroadcastGradientArgs(scope, s_x, s_max);

  Output grad = grad_inputs[0];

      return signalPassFailure();
    } else if (def_op == backward_caller) {
      loop_body_func->emitOpError(
          "Unexpected loop carried variable dependency on sc_");
      return signalPassFailure();
    } else if (llvm::isa<BlockArgument>(operand)) {
      // pass
    } else {
      // This should never happen.