if (i < 0 || i >= cc_ctx->num_inputs()) {
    TF_SetStatus(status, TF_OUT_OF_RANGE, "input index out of range");
    return false;
  }
  TF_SetStatus(status, TF_OK, "");
  return cc_ctx->input_is_ref(i);
}

#ifndef IS_MOBILE_PLATFORM
template <typename T>
static Status ValidateVariantType(const Variant& variant) {
  if (variant.get<T>() == nullptr) {
    const std::string type_index_name =