PocketSphinx  0.6
hmm.h
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37 
42 #ifndef __HMM_H__
43 #define __HMM_H__
44 
45 /* System headers. */
46 #include <stdio.h>
47 
48 /* SphinxBase headers. */
49 #include <sphinxbase/fixpoint.h>
50 #include <sphinxbase/listelem_alloc.h>
51 
52 /* PocketSphinx headers. */
53 #include "bin_mdef.h"
54 
55 #ifdef __cplusplus
56 extern "C" {
57 #endif
58 #if 0
59 } /* Fool Emacs into not indenting things. */
60 #endif
61 
68 typedef int32 frame_idx_t;
69 
73 #define MAX_N_FRAMES MAX_INT32
74 
75 
77 #define SENSCR_SHIFT 10
78 
88 #define WORST_SCORE ((int)0xE0000000)
89 
94 #define TMAT_WORST_SCORE (-255)
95 
99 #define BETTER_THAN >
100 
104 #define WORSE_THAN <
105 
150 typedef struct hmm_context_s {
151  int32 n_emit_state;
152  uint8 ** const *tp;
153  int16 const *senscore;
155  uint16 * const *sseq;
156  int32 *st_sen_scr;
157  listelem_alloc_t *mpx_ssid_alloc;
158  void *udata;
159 } hmm_context_t;
160 
164 #define HMM_MAX_NSTATE 5
165 
174 typedef struct hmm_s {
176  int32 score[HMM_MAX_NSTATE];
177  int32 history[HMM_MAX_NSTATE];
178  int32 out_score;
179  int32 out_history;
180  uint16 ssid;
181  uint16 senid[HMM_MAX_NSTATE];
182  int32 bestscore;
183  int16 tmatid;
185  uint8 mpx;
186  uint8 n_emit_state;
187 } hmm_t;
188 
190 #define hmm_context(h) (h)->ctx
191 #define hmm_is_mpx(h) (h)->mpx
192 
193 #define hmm_in_score(h) (h)->score[0]
194 #define hmm_score(h,st) (h)->score[st]
195 #define hmm_out_score(h) (h)->out_score
196 
197 #define hmm_in_history(h) (h)->history[0]
198 #define hmm_history(h,st) (h)->history[st]
199 #define hmm_out_history(h) (h)->out_history
200 
201 #define hmm_bestscore(h) (h)->bestscore
202 #define hmm_frame(h) (h)->frame
203 #define hmm_mpx_ssid(h,st) (h)->senid[st]
204 #define hmm_nonmpx_ssid(h) (h)->ssid
205 #define hmm_ssid(h,st) (hmm_is_mpx(h) \
206  ? hmm_mpx_ssid(h,st) : hmm_nonmpx_ssid(h))
207 #define hmm_mpx_senid(h,st) (hmm_mpx_ssid(h,st) == BAD_SENID \
208  ? BAD_SENID : (h)->ctx->sseq[hmm_mpx_ssid(h,st)][st])
209 #define hmm_nonmpx_senid(h,st) ((h)->senid[st])
210 #define hmm_senid(h,st) (hmm_is_mpx(h) \
211  ? hmm_mpx_senid(h,st) : hmm_nonmpx_senid(h,st))
212 #define hmm_senscr(h,st) (hmm_senid(h,st) == BAD_SENID \
213  ? WORST_SCORE \
214  : -(h)->ctx->senscore[hmm_senid(h,st)])
215 #define hmm_tmatid(h) (h)->tmatid
216 #define hmm_tprob(h,i,j) (-(h)->ctx->tp[hmm_tmatid(h)][i][j])
217 #define hmm_n_emit_state(h) ((h)->n_emit_state)
218 #define hmm_n_state(h) ((h)->n_emit_state + 1)
219 
224  uint8 ** const *tp,
225  int16 const *senscore,
226  uint16 * const *sseq);
227 
231 #define hmm_context_set_senscore(ctx, senscr) ((ctx)->senscore = (senscr))
232 
241 
245 void hmm_init(hmm_context_t *ctx, hmm_t *hmm, int mpx, int ssid, int tmatid);
246 
250 void hmm_deinit(hmm_t *hmm);
251 
257 void hmm_clear(hmm_t *h);
258 
262 void hmm_clear_scores(hmm_t *h);
263 
267 void hmm_normalize(hmm_t *h, int32 bestscr);
268 
272 void hmm_enter(hmm_t *h, int32 score,
273  int32 histid, int frame);
274 
287 int32 hmm_vit_eval(hmm_t *hmm);
288 
289 
293 int32 hmm_dump_vit_eval(hmm_t *hmm,
294  FILE *fp
295  );
296 
301 void hmm_dump(hmm_t *h,
302  FILE *fp
303  );
304 
305 
306 #if 0
307 { /* Stop indent from complaining */
308 #endif
309 #ifdef __cplusplus
310 }
311 #endif
312 
313 #endif /* __HMM_H__ */
int32 hmm_dump_vit_eval(hmm_t *hmm, FILE *fp)
Like hmm_vit_eval, but dump HMM state and relevant senscr to fp first, for debugging;.
Definition: hmm.c:810
void * udata
Whatever you feel like, gosh.
Definition: hmm.h:158
void hmm_init(hmm_context_t *ctx, hmm_t *hmm, int mpx, int ssid, int tmatid)
Populate a previously-allocated HMM structure, allocating internal data.
Definition: hmm.c:89
An individual HMM among the HMM search space.
int32 * st_sen_scr
Temporary array of senone scores (for some topologies).
Definition: hmm.h:156
listelem_alloc_t * mpx_ssid_alloc
Allocator for senone sequence ID arrays.
Definition: hmm.h:157
void hmm_deinit(hmm_t *hmm)
Free an HMM structure, releasing internal data (but not the HMM structure itself).
Definition: hmm.c:111
Binary format model definition files, with support for heterogeneous topologies and variable-size N-p...
int32 out_score
Score for non-emitting exit state.
Definition: hmm.h:178
uint8 mpx
Is this HMM multiplex? (hoisted for speed)
Definition: hmm.h:185
#define HMM_MAX_NSTATE
Hard-coded limit on the number of emitting states.
Definition: hmm.h:164
uint16 *const * sseq
Senone sequence mapping.
Definition: hmm.h:155
int32 hmm_vit_eval(hmm_t *hmm)
Viterbi evaluation of given HMM.
Definition: hmm.c:789
void hmm_normalize(hmm_t *h, int32 bestscr)
Renormalize the scores in this HMM based on the given best score.
Definition: hmm.c:209
hmm_context_t * hmm_context_init(int32 n_emit_state, uint8 **const *tp, int16 const *senscore, uint16 *const *sseq)
Create an HMM context.
Definition: hmm.c:56
uint16 ssid
Senone sequence ID (for non-MPX)
Definition: hmm.h:180
int32 bestscore
Best [emitting] state score in current frame (for pruning).
Definition: hmm.h:182
Shared information between a set of HMMs.
int32 out_history
History index for non-emitting exit state.
Definition: hmm.h:179
void hmm_enter(hmm_t *h, int32 score, int32 histid, int frame)
Enter an HMM with the given path score and history ID.
Definition: hmm.c:201
void hmm_dump(hmm_t *h, FILE *fp)
For debugging, dump the whole HMM out.
Definition: hmm.c:116
void hmm_clear(hmm_t *h)
Reset the states of the HMM to the invalid condition.
Definition: hmm.c:183
int16 tmatid
Transition matrix ID (see hmm_context_t).
Definition: hmm.h:183
hmm_context_t * ctx
Shared context data for this HMM.
Definition: hmm.h:175
int32 frame_idx_t
Type for frame index values.
Definition: hmm.h:68
void hmm_clear_scores(hmm_t *h)
Reset the scores of the HMM.
Definition: hmm.c:170
void hmm_context_free(hmm_context_t *ctx)
Free an HMM context.
Definition: hmm.c:80
uint8 n_emit_state
Number of emitting states (hoisted for speed)
Definition: hmm.h:186
int16 const * senscore
State emission scores senscore[senid] (negated scaled logs3 values).
Definition: hmm.h:153
uint8 **const * tp
State transition scores tp[id][from][to] (logs3 values).
Definition: hmm.h:152
int32 n_emit_state
Number of emitting states in this set of HMMs.
Definition: hmm.h:151
Definition: hmm.h:174
frame_idx_t frame
Frame in which this HMM was last active; <0 if inactive.
Definition: hmm.h:184