libsent/src/phmm/outprob.c
音響尤度計算の実行および状態レベルキャッシュ [詳細]
#include <sent/stddefs.h>#include <sent/speech.h>#include <sent/htk_hmm.h>#include <sent/htk_param.h>#include <sent/hmm.h>#include <sent/gprune.h>#include "globalvars.h"
マクロ定義 | |
| #define | LOG_UNDEF (LOG_ZERO - 1) |
| Value to be used as the initial cache value. | |
関数 | |
| boolean | outprob_cache_init () |
| boolean | outprob_cache_prepare () |
| static void | outprob_cache_extend (int reqframe) |
| void | outprob_cache_free () |
| LOGPROB | outprob_state (int t, HTK_HMM_State *stateinfo, HTK_Param *param) |
| Compute output probability of a state. | |
| void | outprob_cd_nbest_init (int num) |
| void | outprob_cd_nbest_free () |
| static LOGPROB | outprob_cd_nbest (int t, CD_State_Set *lset, HTK_Param *param) |
| static LOGPROB | outprob_cd_max (int t, CD_State_Set *lset, HTK_Param *param) |
| static LOGPROB | outprob_cd_avg (int t, CD_State_Set *lset, HTK_Param *param) |
| LOGPROB | outprob_cd (int t, CD_State_Set *lset, HTK_Param *param) |
| LOGPROB | outprob (int t, HMM_STATE *hmmstate, HTK_Param *param) |
変数 | |
| static int | statenum |
| Local work area that holds total number of HMM states in the HMM definition data. | |
| static LOGPROB ** | outprob_cache = NULL |
| State-level cache [t][stateid]. | |
| static int | allocframenum |
| Allocated frames of the cache. | |
| static int | allocblock |
| Allocation block size per allocateion of the cache. | |
| static BMALLOC_BASE * | croot |
| Root alloc pointer to state outprob cache. | |
| static LOGPROB * | last_cache |
| Local work are to hold cache list of current time. | |
| static LOGPROB * | maxprobs |
| Work area that holds N-best state scores for pseudo state set. | |
| static int | maxn |
| Allocated length of above. | |
説明
音響尤度計算の実行および状態レベルキャッシュ
- 日付:
- Fri Feb 18 18:45:21 2005
HMM の状態の出力確率（対数尤度）を計算します．状態の型（単語末端の pseudo HMM set かどうか）にしたがっていくつか定義されていますが， 全て下位の outprob_state() を呼びます．outprob_state() は 必要な情報を OP_ で始まる大域変数に格納し，calc_outprob_state() を呼び 出します．calc_outprob_state() は関数のポインタであり，実体は tied-mixture モデルの場合 calc_tied_mix(), それ以外の場合は calc_mix() となります． （GMS を使用する場合は gms_state()）になります．
状態レベルの音響尤度キャッシュが行なわれます．キャッシュは 状態 x 入力フレームで格納され，必要な長さにしたがって伸長されます．このキャッシュは 第2パスの計算でも用いるため，全時間に渡って記録されています．
なお tied-mixture の場合はコードブックレベルでのキャッシュも同時に 行なわれます．これについては calc_tied_mix.c をご覧下さい．
- Revision
- 1.5
outprob.c で定義されています。
関数
| boolean outprob_cache_init | ( | ) |
Initialize the cache data, should be called once on startup.
- 戻り値:
- TRUE on success, FALSE on failure.
参照元 outprob_init().
| boolean outprob_cache_prepare | ( | ) |
Prepare cache for the next input, by clearing the existing cache.
- 戻り値:
- TRUE on success, FALSE on failure.
参照元 outprob_prepare().
| static void outprob_cache_extend | ( | int | reqframe | ) | [static] |
Expand the cache to time axis if needed.
- 引数:
-
reqframe [in] required frame length
参照元 outprob_state().
| void outprob_cache_free | ( | ) |
| LOGPROB outprob_state | ( | int | t, | |
| HTK_HMM_State * | stateinfo, | |||
| HTK_Param * | param | |||
| ) |
Compute output probability of a state.
Set the needed values to the global variables that begins with "OP_", and call calc_outprob_state(). The calc_outprob_state() is actually a function pointer, and the entity is either calc_tied_mix() for tied-mixture model and calc_mix() for others. (If you use GMS, the entity will be gms_state() instead.)
The state-level cache is also consulted here.
- 戻り値:
- output log probability.
参照元 next_word(), outprob(), outprob_cd_avg(), outprob_cd_max(), outprob_cd_nbest(), outprob_style(), と start_word().
| void outprob_cd_nbest_init | ( | int | num | ) |
Initialize work area for outprob_cd_nbest().
- 引数:
-
num [in] number of top states to be calculated.
参照元 outprob_init().
| void outprob_cd_nbest_free | ( | ) |
| static LOGPROB outprob_cd_nbest | ( | int | t, | |
| CD_State_Set * | lset, | |||
| HTK_Param * | param | |||
| ) | [static] |
Return average of N-beat outprob for pseudo state set.
- 引数:
-
t [in] input frame lset [in] pseudo state set param [in] input parameter data
- 戻り値:
- outprob log probability, average of top N states in lset.
参照元 outprob_cd().
| static LOGPROB outprob_cd_max | ( | int | t, | |
| CD_State_Set * | lset, | |||
| HTK_Param * | param | |||
| ) | [static] |
Return maximum outprob of the pseudo state set.
- 引数:
-
t [in] input frame lset [in] pseudo state set param [in] input parameter data
- 戻り値:
- maximum output log probability among states in lset.
参照元 outprob_cd().
| static LOGPROB outprob_cd_avg | ( | int | t, | |
| CD_State_Set * | lset, | |||
| HTK_Param * | param | |||
| ) | [static] |
Return average outprob of the pseudo state set.
- 引数:
-
t [in] input frame lset [in] pseudo state set param [in] input parameter data
- 戻り値:
- average output log probability of states in lset.
参照元 outprob_cd().
| LOGPROB outprob_cd | ( | int | t, | |
| CD_State_Set * | lset, | |||
| HTK_Param * | param | |||
| ) |
Compute the log output probability of a pseudo state set.
- 引数:
-
t [in] input frame lset [in] pseudo state set param [in] input parameter data
- 戻り値:
- the computed log output probability.
参照元 next_word(), outprob(), outprob_style(), と start_word().
Top function to compute the output probability of a HMM state.
- 引数:
-
t [in] input frame hmmstate [in] HMM state param [in] input parameter data
- 戻り値:
- the computed log output probability.
参照元 scan_word(), と viterbi_segment().
