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/*!
 * \brief Get a new symbol from the graph.
 * \param graph The graph handle.
 * \param symbol The corresponding symbol
 * \return 0 when success, -1 when failure happens
 */
int NNGraphGetSymbol(GraphHandle graph, SymbolHandle *out);

/*!
 * \brief Get Set a attribute in json format.
 * This feature allows pass graph attributes back and forth in reasonable speed.
 *
 * \param handle The graph handle.
 * \param key The key to the attribute.
 * \param json_value The value need to be in format [type_name, value],
 *  Where type_name is a registered type string in C++ side via DMLC_JSON_ENABLE_ANY.
 * \return 0 when success, -1 when failure happens
 */
int NNGraphSetJSONAttr(GraphHandle handle,
                                const char* key,
                                const char* json_value);


/*!
 * \brief Get a serialized attrirbute from graph.
 * This feature allows pass graph attributes back and forth in reasonable speed.
 *
 * \param handle The graph handle.
 * \param key The key to the attribute.
 * \param json_out The result attribute, can be NULL if the attribute do not exist.
 *  The json_out is an array of [type_name, value].
 *  Where the type_name is a registered type string in C++ side via DMLC_JSON_ENABLE_ANY.
 * \param success Whether the result is contained in out.
 * \return 0 when success, -1 when failure happens
 */
int NNGraphGetJSONAttr(SymbolHandle in,
                                const char* key,
                                const char** out,
                                int *out);

/*!
 * \brief Set a attribute whose type is std::vector<NodeEntry> in c++
 * This feature allows pass List of symbolic variables for gradient request.
 *
 * \note This is beta feature only used for test purpos
 *
 * \param handle The graph handle.
 * \param key The key to the attribute.
 * \param list The symbol whose outputs represents the list of NodeEntry to be passed.
 * \return 0 when success, -1 when failure happens
 */
int NNGraphSetNodeEntryListAttr_(GraphHandle handle,
                                          const char* key,
                                          SymbolHandle in);
/*!