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 * \brief Set the last error message needed by C API
 * \param msg The error message to set.
 */
void NNAPISetLastError(const char* msg);
/*!
 * \brief return str message of the last error
 *  all function in this file will return 0 when success
 *  and -1 when an error occured,
 *  NNGetLastError can be called to retrieve the error
 *
 *  this function is threadsafe and can be called by different thread
 *  \return error info
 */
const char *NNGetLastError(void);
/*!
 * \brief list all the available operator names, include entries.
 * \param out_size the size of returned array
 * \param out_array the output operator name array.
 * \return 0 when success, -1 when failure happens
 */
int NNListAllOpNames(nn_uint *out_size, const char*** out_array);