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 * \param out The output symbol whose outputs are the index-th symbol.
 * \return 0 when success, -1 when failure happens
 */
int NNSymbolGetOutput(SymbolHandle in,
                               nn_uint index,
                               SymbolHandle *out);

/*!
 * \brief Compose the symbol on other symbols.
 *
 *  This function will change the sym hanlde.
 *  To achieve function apply behavior, copy the symbol first
 *  before apply.
 *
 * \param sym the symbol to apply
 * \param name the name of symbol
 * \param num_args number of arguments
 * \param keys the key of keyword args (optional)
 * \param symbols arguments to sym
 * \return 0 when success, -1 when failure happens
 */