File size: 4,662 Bytes
5610573 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 | #include <pocketsphinx.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include "pocketsphinx_internal.h"
#include "ngram_search_fwdtree.h"
#include "ps_lattice_internal.h"
#include "test_macros.h"
int
test_decode(ps_decoder_t *ps)
{
FILE *rawfh;
int16 buf[2048];
size_t nread;
int16 const *bptr;
int nfr;
ps_lattice_t *dag;
acmod_t *acmod;
ngram_search_t *ngs;
int i, j;
ps_latlink_t *link;
ps_latnode_t *node;
latlink_list_t *x;
int32 norm, post;
ngs = (ngram_search_t *)ps->search;
acmod = ps->acmod;
/* Decode stuff and build a DAG. */
TEST_ASSERT(rawfh = fopen(DATADIR "/goforward.raw", "rb"));
TEST_EQUAL(0, acmod_start_utt(acmod));
ngram_fwdtree_start(ngs);
while (!feof(rawfh)) {
nread = fread(buf, sizeof(*buf), 2048, rawfh);
bptr = buf;
while ((nfr = acmod_process_raw(acmod, &bptr, &nread, FALSE)) > 0) {
while (acmod->n_feat_frame > 0) {
ngram_fwdtree_search(ngs, acmod->output_frame);
acmod_advance(acmod);
}
}
}
ngram_fwdtree_finish(ngs);
printf("FWDTREE: %s\n",
ngram_search_bp_hyp(ngs, ngram_search_find_exit(ngs, -1, NULL)));
TEST_ASSERT(acmod_end_utt(acmod) >= 0);
fclose(rawfh);
dag = ngram_search_lattice(ps->search);
if (dag == NULL) {
E_ERROR("Failed to build DAG!\n");
return -1;
}
/* Write lattice to disk. */
TEST_EQUAL(0, ps_lattice_write(dag, "test_posterior.lat"));
/* Do a bunch of checks on the DAG generation and traversal code: */
/* Verify that forward and backward iteration give the same number of edges. */
i = j = 0;
for (link = ps_lattice_traverse_edges(dag, NULL, NULL);
link; link = ps_lattice_traverse_next(dag, NULL)) {
++i;
}
for (link = ps_lattice_reverse_edges(dag, NULL, NULL);
link; link = ps_lattice_reverse_next(dag, NULL)) {
++j;
}
printf("%d forward edges, %d reverse edges\n", i, j);
TEST_EQUAL(i,j);
/* Verify that the same links are reachable via entries and exits. */
for (node = dag->nodes; node; node = node->next) {
for (x = node->exits; x; x = x->next)
x->link->alpha = -42;
}
for (node = dag->nodes; node; node = node->next) {
for (x = node->entries; x; x = x->next)
TEST_EQUAL(x->link->alpha, -42);
}
/* Verify that forward iteration is properly ordered. */
for (link = ps_lattice_traverse_edges(dag, NULL, NULL);
link; link = ps_lattice_traverse_next(dag, NULL)) {
link->alpha = 0;
for (x = link->from->entries; x; x = x->next) {
TEST_EQUAL(x->link->alpha, 0);
}
}
/* Verify that backward iteration is properly ordered. */
for (node = dag->nodes; node; node = node->next) {
for (x = node->exits; x; x = x->next)
x->link->alpha = -42;
}
for (link = ps_lattice_reverse_edges(dag, NULL, NULL);
link; link = ps_lattice_reverse_next(dag, NULL)) {
link->alpha = 0;
for (x = link->to->exits; x; x = x->next) {
TEST_EQUAL(x->link->alpha, 0);
}
}
/* Find and print best path. */
link = ps_lattice_bestpath(dag, ngs->lmset, 1.0, 1.0/20.0);
printf("BESTPATH: %s\n", ps_lattice_hyp(dag, link));
/* Calculate betas. */
post = ps_lattice_posterior(dag, ngs->lmset, 1.0/20.0);
printf("Best path score: %d\n",
link->path_scr + dag->final_node_ascr);
printf("P(S|O) = %d\n", post);
/* Verify that sum of final alphas and initial alphas+betas is
* sufficiently similar. */
norm = logmath_get_zero(acmod->lmath);
for (x = dag->start->exits; x; x = x->next)
norm = logmath_add(acmod->lmath, norm, x->link->beta + x->link->alpha);
E_INFO("Sum of final alphas+betas = %d\n", dag->norm);
E_INFO("Sum of initial alphas+betas = %d\n", norm);
TEST_EQUAL_LOG(dag->norm, norm);
/* Print posterior probabilities for each link in best path. */
while (link) {
printf("P(%s,%d) = %d = %f\n",
dict_wordstr(ps->search->dict, link->from->wid),
link->ef,
link->alpha + link->beta - dag->norm,
logmath_exp(acmod->lmath, link->alpha + link->beta - dag->norm));
link = link->best_prev;
}
return 0;
}
int
main(int argc, char *argv[])
{
ps_decoder_t *ps;
cmd_ln_t *config;
int rv;
(void)argc;
(void)argv;
TEST_ASSERT(config =
ps_config_parse_json(
NULL,
"hmm: \"" MODELDIR "/en-us/en-us\","
"lm: \"" MODELDIR "/en-us/en-us.lm.bin\","
"dict: \"" MODELDIR "/en-us/cmudict-en-us.dict\","
"fwdtree: true,"
"fwdflat: false,"
"bestpath: true,"
"samprate: 16000"));
TEST_ASSERT(ps = ps_init(config));
rv = test_decode(ps);
ps_free(ps);
ps_config_free(config);
return rv;
}
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