| % AUTORIGHTS |
| % Copyright (C) 2007 Princeton University |
| % |
| % This file is part of Ferret Toolkit. |
| % |
| % Ferret Toolkit is free software; you can redistribute it and/or modify |
| % it under the terms of the GNU General Public License as published by |
| % the Free Software Foundation; either version 2, or (at your option) |
| % any later version. |
| % |
| % This program is distributed in the hope that it will be useful, |
| % but WITHOUT ANY WARRANTY; without even the implied warranty of |
| % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| % GNU General Public License for more details. |
| % |
| % You should have received a copy of the GNU General Public License |
| % along with this program; if not, write to the Free Software Foundation, |
| % Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| \section{Distance Functions} |
| New distance functions can be added by toolkit user. Also the |
| customized distance function (eg: L2 distance using only certain |
| dimensions from the cass\_vec) can be generated on the fly to satisfy |
| customized queries. |
| |
| \subsection{CASS Distance Functions} |
| \begin{verbatim} |
| enum cass_vecset_type_t {any_vecset, single_cass_vec, set_of_cass_vecs, |
| ...}; |
| enum cass_cass_vec_type_t {any_cass_vec, float_array, L1_sketch, |
| multires_sketch, ...}; |
| enum cass_vecset_dist_measure_t {any_vecset_dist, emd, |
| one_to_one_best_match, ...}; |
| enum cass_cass_vec_distance_measure_t {any_cass_vec_dist, L1, L2, ...}; |
| |
| float (*cass_cass_vec_dist_func)(cass_cass_vec_t *f1, cass_cass_vec_t *f2); |
| float (*cass_vecset_dist_func)(cass_vecset_t *f1, cass_vecset_t *f2); |
| |
| \end{verbatim} |
| |
