! * \brief Query whether this tree contains any categorical splits */

! * \brief Whether the node is leaf node * \param nid ID of node being queried */

! * \brief Get leaf value of the leaf node * \param nid ID of node being queried */

! \brief disable copy; use default move */

! * \brief Construct handler to be added to given delegator's stack * \param parent_delegator Pointer to Delegator for this handler * \param

! * \brief Feature index of the node's split condition * \param nid ID of node being queried */

! * \brief Get hessian sum * \param nid ID of node being queried */

! * \brief Create thread configuration. * @param nthread Number of threads to use. If \<= 0, use all available threads. This value is *

! * \brief Get threshold of the node * \param nid ID of node being queried */

! * \brief handle Exception thrown out * \param e Exception object * \return The return value of API after exception is handled */