00001 /* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */ 00002 /* ==================================================================== 00003 * Copyright (c) 1999-2007 Carnegie Mellon University. All rights 00004 * reserved. 00005 * 00006 * Redistribution and use in source and binary forms, with or without 00007 * modification, are permitted provided that the following conditions 00008 * are met: 00009 * 00010 * 1. Redistributions of source code must retain the above copyright 00011 * notice, this list of conditions and the following disclaimer. 00012 * 00013 * 2. Redistributions in binary form must reproduce the above copyright 00014 * notice, this list of conditions and the following disclaimer in 00015 * the documentation and/or other materials provided with the 00016 * distribution. 00017 * 00018 * This work was supported in part by funding from the Defense Advanced 00019 * Research Projects Agency and the National Science Foundation of the 00020 * United States of America, and the CMU Sphinx Speech Consortium. 00021 * 00022 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 00023 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 00024 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 00025 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY 00026 * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00027 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00028 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00029 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00030 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00031 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00032 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00033 * 00034 * ==================================================================== 00035 * 00036 */ 00037 /* 00038 * \file lm3g_model.h Core Sphinx 3-gram code used in 00039 * DMP/DMP32/ARPA (for now) model code. 00040 * 00041 * Author: A cast of thousands, probably. 00042 */ 00043 00044 #ifndef __NGRAM_MODEL_LM3G_H__ 00045 #define __NGRAM_MODEL_LM3G_H__ 00046 00047 #include <listelem_alloc.h> 00048 00049 #include "ngram_model_internal.h" 00050 00054 typedef union { 00055 float32 f; 00056 int32 l; 00057 } lmprob_t; 00058 00062 typedef struct unigram_s { 00063 lmprob_t prob1; 00064 lmprob_t bo_wt1; 00065 int32 bigrams; 00066 } unigram_t; 00067 00071 typedef struct bigram_s bigram_t; 00075 typedef struct trigram_s trigram_t; 00076 00077 00078 /* 00079 * To conserve space, bigram info is kept in many tables. Since the number 00080 * of distinct values << #bigrams, these table indices can be 16-bit values. 00081 * prob2 and bo_wt2 are such indices, but keeping trigram index is less easy. 00082 * It is supposed to be the index of the first trigram entry for each bigram. 00083 * But such an index cannot be represented in 16-bits, hence the following 00084 * segmentation scheme: Partition bigrams into segments of BG_SEG_SZ 00085 * consecutive entries, such that #trigrams in each segment <= 2**16 (the 00086 * corresponding trigram segment). The bigram_t.trigrams value is then a 00087 * 16-bit relative index within the trigram segment. A separate table-- 00088 * lm_t.tseg_base--has the index of the 1st trigram for each bigram segment. 00089 */ 00090 #define BG_SEG_SZ 512 /* chosen so that #trigram/segment <= 2**16 */ 00091 #define LOG_BG_SEG_SZ 9 00092 00100 typedef struct tginfo_s { 00101 int32 w1; 00103 int32 n_tg; 00104 int32 bowt; 00105 int32 used; 00106 trigram_t *tg; 00107 struct tginfo_s *next; 00108 } tginfo_t; 00109 00113 typedef struct lm3g_model_s { 00114 unigram_t *unigrams; 00115 bigram_t *bigrams; 00116 trigram_t *trigrams; 00117 lmprob_t *prob2; 00118 int32 n_prob2; 00119 lmprob_t *bo_wt2; 00120 int32 n_bo_wt2; 00121 lmprob_t *prob3; 00122 int32 n_prob3; 00123 int32 *tseg_base; 00125 tginfo_t **tginfo; 00127 listelem_alloc_t *le; 00128 } lm3g_model_t; 00129 00130 void lm3g_tginfo_free(ngram_model_t *base, lm3g_model_t *lm3g); 00131 void lm3g_tginfo_reset(ngram_model_t *base, lm3g_model_t *lm3g); 00132 void lm3g_apply_weights(ngram_model_t *base, 00133 lm3g_model_t *lm3g, 00134 float32 lw, float32 wip, float32 uw); 00135 int32 lm3g_add_ug(ngram_model_t *base, 00136 lm3g_model_t *lm3g, int32 wid, int32 lweight); 00137 00138 00139 #endif /* __NGRAM_MODEL_LM3G_H__ */