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#include "sctk.h"
/*
File: slm_intf.c
Date: March 20, 1998
This file contains interface functions to lookup probs from a language
model read in by the SLM toolkit libraries.
The only function that is always defined is lookup_lm_word_weight. If the
SLM is not included, then executing this function is an error.
*/
void lookup_lm_word_weight(ARC *arc, void *ptr){
#ifdef WITH_SLM
WORD *tw = (WORD *)(arc->data);
static init = 1;
static ng_t ng;
static fb_info *fb_list;
WORD *w = (WORD *)arc->data, *w_m1, *w_m2;
double sum_weight, lu_prob, def_w;
int nprob;
ARC_LIST_ATOM *oarc_a, *oarc_b;
int dbg = 0;
if (init){
initialize_lm(&ng,&fb_list, (char *)ptr, dbg);
init = 0;
}
#define W_func(_d) (log(1.0 / (_d)) * 1.4426950408889634074)
/* Set the default weight for this word */
def_w = (w->opt_del) ? 0.0 : 20.0;
nprob = 0, sum_weight = 0;
if (dbg) printf("w->value= %s
",w->value);
/* search for the previous word */
if (! arc->from_node->start_state && ng.n > 1 && ! w->opt_del){
for (oarc_a = arc->from_node->in_arcs; oarc_a != NULL; oarc_a=oarc_a->next){
w_m1 = (WORD*)(oarc_a->arc->data);
if (! oarc_a->arc->from_node->start_state && ng.n > 2){
for (oarc_b = oarc_a->arc->from_node->in_arcs; oarc_b != NULL; oarc_b=oarc_b->next){
w_m2 = (WORD*)(oarc_b->arc->data);
if (dbg) printf(" w-1= %s w-2= %s
",w_m1->value,w_m2->value);
sum_weight +=
(tg_lookup(w, w_m1, w_m2, &ng, fb_list, &lu_prob, dbg)) ? W_func(lu_prob) : def_w;
nprob ++;
}
} else {
w_m2 = (WORD *)0;
if (dbg) printf(" w-1= %s w-2= No-context
",w_m1->value);
sum_weight +=
(tg_lookup(w, w_m1, w_m2, &ng, fb_list, &lu_prob, dbg)) ? W_func(lu_prob) : def_w;
nprob ++;
}
}
} else {
w_m1 = w_m2 = (WORD *)0;
if (dbg) printf(" w-1= No-context w-2= No-context
");
if (! w->opt_del)
sum_weight +=
(tg_lookup(w, w_m1, w_m2, &ng, fb_list, &lu_prob, dbg)) ? W_func(lu_prob) : def_w;
nprob ++;
}
if (dbg) printf(" AvgWeight= \t%g
",sum_weight/nprob);
tw->weight = sum_weight / nprob;
#else
fprintf(scfp,"Error: a call to lookup_lm_word_weight() was made even though
"
" the SLM toolkit has not been included in the compilation of SCTK
");
exit(1);
#endif
}
#ifdef WITH_SLM
/*****************************************************************/
/* given upto three WORDS, lookup the N-gram in a language model */
int tg_lookup(WORD *w, WORD *w_m1, WORD *w_m2, ng_t *ng, fb_info *fb_list, double *prob, int dbg){
int32 h_lu, m1_lu, m2_lu;
id__t h_id, m_id[3];
int bo_case = 0, acl = 0;
int actual_context;
if (sih_lookup(ng->vocab_ht,
(char *)((w->opt_del)?w->intern_value:w->value),&h_lu) == 0){
if (dbg) printf(" Head Word Not in Vocab
");
*prob = 0.0;
return(0);
}
h_id = (id__t)h_lu;
if (w_m1 != (WORD *)0){
sih_lookup(ng->vocab_ht,
(char *)((w_m1->opt_del)?w_m1->intern_value:w_m1->value),&m1_lu);
actual_context = 1;
m_id[0] = (id__t)m1_lu;
if (w_m2 != (WORD *)0){
sih_lookup(ng->vocab_ht,
(char *)((w_m2->opt_del)?w_m2->intern_value:w_m2->value),&m2_lu);
actual_context = 2;
m_id[0] = (id__t)m2_lu;
m_id[1] = (id__t)m1_lu;
}
} else {
actual_context = 0;
}
*prob = calc_prob_of(h_id,m_id,actual_context,ng,(arpa_lm_t *)0,
fb_list,&bo_case,&acl,0);
if (dbg){
printf(" Texts: P(%s | ",(char *)w->value);
if (ng->n > 2) printf("%s ",(w_m2 == (WORD *)0) ? "UNK" : (char *)w_m2->value);
if (ng->n > 1) printf("%s",(w_m1 == (WORD *)0) ? "UNK" : (char *)w_m1->value);
printf(") = %g bo_case ",*prob);
decode_bo_case(bo_case,acl,stdout);
}
return(1);
}
/*****************************************************************/
/* Read in a lanagauge model, an set up the structures. */
void initialize_lm(ng_t *ng, fb_info **fb_list, char *lm_file, int dbg){
if (lm_file != (char *)0){
if (dbg) printf("Loading LM file '%s'
",lm_file);
load_lm(ng,lm_file); /* if it failes, it dies */
if (dbg) {
printf("LM read in -
");
printf(" version: %d
",ng->version);
printf(" #-gram order: %d
",ng->n);
printf(" vocabulary size: %d
",ng->vocab_size);
}
*fb_list = gen_fb_list(ng->vocab_ht,
ng->vocab_size,
ng->vocab,
ng->context_cue,
0, 0, 0, 0,
"");
/* This code works as a test, except the printout for bo_case is wrong for
the trigram. it output 3x2x1 instead of 3x2-1 */
if (dbg){
int32 lu1, lu2, lu3; id__t h_id, m_id[4]; double prob;
int bo_case = 0, acl = 0;
if (sih_lookup(ng->vocab_ht,"the",&lu1) == 0)
printf(" Head Word Not in Vocab
");
m_id[0] = lu1;
h_id = lu1;
prob = calc_prob_of(h_id,m_id,0,ng,(arpa_lm_t *)0,*fb_list,&bo_case,&acl,0);
printf(" P(%s| ) = %g bo_case ",ng->vocab[lu1],prob);
decode_bo_case(bo_case,acl,stdout);
if (ng->n > 1) {
if (sih_lookup(ng->vocab_ht,"dow",&lu2) == 0)
printf(" Head Word Not in Vocab
");
m_id[0] = lu1;
h_id = lu2;
prob = calc_prob_of(h_id,m_id,1,ng,(arpa_lm_t *)0,*fb_list,&bo_case,&acl,0);
printf(" P(%s | the) = %g bo_case ",ng->vocab[lu2],prob);
decode_bo_case(bo_case,acl,stdout);
if (ng->n > 2) {
if (sih_lookup(ng->vocab_ht,"jones",&lu3) == 0)
printf(" Head Word Not in Vocab
");
m_id[0] = lu1;
m_id[1] = lu2;
h_id = lu3;
prob = calc_prob_of(h_id,m_id,2,ng,(arpa_lm_t *)0,*fb_list,&bo_case,&acl,0);
printf(" P(jones | the dow) = %g bo_case ",prob);
decode_bo_case(bo_case,acl,stdout);
}
}
}
} else {
fprintf(stderr,"Error: no lm_file name passed to alignment
");
}
}
#endif
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