libsent/include/sent/hmm_calc.h File Reference

Work area and outprob cache for acoustic computation. More...

#include <sent/stddefs.h>
#include <sent/htk_hmm.h>
#include <sent/htk_param.h>

Go to the source code of this file.

Data Structures

struct MIXCACHE

A component of per-codebook probability cache while search. More...

struct HMMWork

Work area and cache for HMM computation. More...

Defines

#define TMBEAMWIDTH   5.0

Score beam offset for GPRUNE_SEL_BEAM.

Enumerations

enum {
  GPRUNE_SEL_UNDEF, GPRUNE_SEL_NONE, GPRUNE_SEL_SAFE, GPRUNE_SEL_HEURISTIC,
  GPRUNE_SEL_BEAM
}

Symbols to specify which Gaussian pruning algorithm to use. More...

Functions

void make_log_tbl ()

Generate a value tables of $\log (1+e^x)$ .

LOGPROB addlog (LOGPROB x, LOGPROB y)

Rapid computation of $\log (e^x + e^y)$ .

LOGPROB addlog_array (LOGPROB *x, int n)

Rapid computation of $\log (\sum_{i=1}^N e^{x_i})$ .

boolean outprob_init (HMMWork *wrk, HTK_HMM_INFO *hmminfo, HTK_HMM_INFO *gshmm, int gms_num, int gprune_method, int gprune_mixnum)

Initialize and setup acoustic computation functions.

boolean outprob_prepare (HMMWork *wrk, int framenum)

Prepare for the next input of given frame length.

void outprob_free (HMMWork *wrk)

Free all work area for outprob computation.

boolean outprob_cache_init (HMMWork *wrk)

Initialize the cache data, should be called once on startup.

boolean outprob_cache_prepare (HMMWork *wrk)

Prepare cache for the next input, by clearing the existing cache.

void outprob_cache_free (HMMWork *wrk)

Free work area for cache.

LOGPROB outprob_state (HMMWork *wrk, int t, HTK_HMM_State *stateinfo, HTK_Param *param)

Compute output probability of a state.

void outprob_cd_nbest_init (HMMWork *wrk, int num)

Initialize work area for outprob_cd_nbest().

void outprob_cd_nbest_free (HMMWork *wrk)

Free work area for outprob_cd_nbest().

LOGPROB outprob_cd (HMMWork *wrk, int t, CD_State_Set *lset, HTK_Param *param)

Compute the log output probability of a pseudo state set.

boolean gms_init (HMMWork *wrk)

Initialize the GMS related functions and data.

boolean gms_prepare (HMMWork *wrk, int framelen)

Setup GMS parameters for next input.

void gms_free (HMMWork *wrk)

Free GMS related work areas.

LOGPROB gms_state (HMMWork *wrk)

Get HMM State probability of current state with Gaussiam Mixture Selection.

void gms_gprune_init (HMMWork *wrk)

Initialization of GMS HMM likelihood computation.

void gms_gprune_prepare (HMMWork *wrk)

Prepare GMS HMM computation for the next speech input.

void gms_gprune_free (HMMWork *wrk)

Free GMS related work area.

void compute_gs_scores (HMMWork *wrk)

Main function to compute all the GMS HMM states in a frame with the input vectore specified by OP_vec.

LOGPROB calc_mix (HMMWork *wrk)

Compute the output probability of current state OP_State.

boolean calc_tied_mix_init (HMMWork *wrk)

Initialize codebook cache area.

boolean calc_tied_mix_prepare (HMMWork *wrk, int framenum)

Setup codebook cache for the next incoming input.

void calc_tied_mix_free (HMMWork *wrk)

Free work area for tied-mixture calculation.

LOGPROB calc_tied_mix (HMMWork *wrk)

Compute the output probability of current state OP_State on tied-mixture model.

int cache_push (HMMWork *wrk, int id, LOGPROB score, int len)

Store a score to the current list of computed Gaussians.

LOGPROB compute_g_base (HMMWork *wrk, HTK_HMM_Dens *binfo)

Calculate probability of a Gaussian density against input vector on OP_vec.

boolean gprune_none_init (HMMWork *wrk)

Initialize and setup work area for Gaussian computation.

void gprune_none_free (HMMWork *wrk)

Free gprune_none related work area.

void gprune_none (HMMWork *wrk, HTK_HMM_Dens **g, int num, int *last_id)

Compute a set of Gaussians with no pruning.

LOGPROB compute_g_safe (HMMWork *wrk, HTK_HMM_Dens *binfo, LOGPROB thres)

Calculate probability with safe pruning.

boolean gprune_safe_init (HMMWork *wrk)

Initialize and setup work area for Gaussian pruning by safe algorithm.

void gprune_safe_free (HMMWork *wrk)

Free gprune_safe related work area.

void gprune_safe (HMMWork *wrk, HTK_HMM_Dens **g, int gnum, int *last_id)

Compute a set of Gaussians with safe pruning.

boolean gprune_heu_init (HMMWork *wrk)

Initialize and setup work area for Gaussian pruning by heuristic algorithm.

void gprune_heu_free (HMMWork *wrk)

Free gprune_heu related work area.

void gprune_heu (HMMWork *wrk, HTK_HMM_Dens **g, int gnum, int *last_id)

Compute a set of Gaussians with heuristic pruning.

boolean gprune_beam_init (HMMWork *wrk)

Initialize and setup work area for Gaussian pruning by beam algorithm.

void gprune_beam_free (HMMWork *wrk)

Free gprune_beam related work area.

void gprune_beam (HMMWork *wrk, HTK_HMM_Dens **g, int gnum, int *last_id)

Compute a set of Gaussians with beam pruning.

Detailed Description

Work area and outprob cache for acoustic computation.

Author:: Akinobu LEE

Date:: Thu Feb 10 14:54:06 2005

Revision: 1.2

Definition in file hmm_calc.h.

Define Documentation

#define TMBEAMWIDTH 5.0

Score beam offset for GPRUNE_SEL_BEAM.

Larger value may ease pruning error, but processing may become slower. Smaller value can speed up the acoustic computation, but may cause error.

Definition at line 52 of file hmm_calc.h.

Referenced by set_dimthres().

Enumeration Type Documentation

anonymous enum

Symbols to specify which Gaussian pruning algorithm to use.

GPRUNE_SEL_UNDEF: unspecified by user
GPRUNE_SEL_NONE: no pruning
GPRUNE_SEL_SAFE: safe pruning
GPRUNE_SEL_HEURISTIC: heuristic pruning
GPRUNE_SEL_BEAM: beam pruning

Definition at line 43 of file hmm_calc.h.

Function Documentation

void make_log_tbl ( )

Generate a value tables of $\log (1+e^x)$ .

$x$ is from 0 to (- VRANGE), and table size is TBLSIZE.

Definition at line 42 of file addlog.c.

Referenced by outprob_init().

LOGPROB addlog	(	LOGPROB	x,
		LOGPROB	y
	)

Rapid computation of $\log (e^x + e^y)$ .

If value differs more than LOG_ADDMIN, the larger value will be returned as is.

Parameters:

	x	[in] log value
	y	[in] log value

Returns:: result value.

Definition at line 71 of file addlog.c.

LOGPROB addlog_array	(	LOGPROB *	a,
		int	n
	)

Rapid computation of $\log (\sum_{i=1}^N e^{x_i})$ .

Parameters:

	a	[in] array of log values
	n	[in] length of above

Returns:: the result value.

Definition at line 103 of file addlog.c.

Referenced by calc_mix(), calc_tied_mix(), and gmm_calc_mix().

boolean outprob_init	(	HMMWork *	wrk,
		HTK_HMM_INFO *	hmminfo,
		HTK_HMM_INFO *	gshmm,
		int	gms_num,
		int	gprune_method,
		int	gprune_mixnum
	)

Initialize and setup acoustic computation functions.

Parameters:

	wrk	[i/o] HMM computation work area
	hmminfo	[in] HMM definition
	gshmm	[in] GMS HMM definition if exist, or NULL if not
	gms_num	[in] number of GMS HMM to compute (valid if gshmm != NULL)
	gprune_method	[in] gaussian pruning method
	gprune_mixnum	[in] number of pdf to compute at a codebook in gaussian pruning

Returns:: TRUE on success, FALSE on failure.

select functions

Definition at line 68 of file outprob_init.c.

Referenced by j_final_fusion().

boolean outprob_prepare	(	HMMWork *	wrk,
		int	framenum
	)

Prepare for the next input of given frame length.

Parameters:

	wrk	[i/o] HMM computation work area
	framenum	[in] input length in frame.

Returns:: TRUE on success, FALSE on failure.

Definition at line 166 of file outprob_init.c.

Referenced by get_back_trellis(), RealTimePipeLine(), and reset_mfcc().

void outprob_free ( HMMWork * wrk )

Free all work area for outprob computation.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 187 of file outprob_init.c.

Referenced by j_process_am_free().

boolean outprob_cache_init ( HMMWork * wrk )

Initialize the cache data, should be called once on startup.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: TRUE on success, FALSE on failure.

Definition at line 78 of file outprob.c.

Referenced by outprob_init().

boolean outprob_cache_prepare ( HMMWork * wrk )

Prepare cache for the next input, by clearing the existing cache.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: TRUE on success, FALSE on failure.

Definition at line 96 of file outprob.c.

Referenced by outprob_prepare().

void outprob_cache_free ( HMMWork * wrk )

Free work area for cache.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 158 of file outprob.c.

Referenced by outprob_free().

LOGPROB outprob_state	(	HMMWork *	wrk,
		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.

Parameters:

	wrk	[i/o] HMM computation work area
	t	[in] time frame
	stateinfo	[in] state information to compute the output probability
	param	[in] input parameter vectors

Returns:: output log probability.

Definition at line 184 of file outprob.c.

Referenced by next_word(), outprob(), outprob_cd_avg(), outprob_cd_max(), outprob_cd_nbest(), and start_word().

void outprob_cd_nbest_init	(	HMMWork *	wrk,
		int	num
	)

Initialize work area for outprob_cd_nbest().

Parameters:

	wrk	[i/o] HMM computation work area
	num	[in] number of top states to be calculated.

Definition at line 219 of file outprob.c.

Referenced by outprob_init().

void outprob_cd_nbest_free ( HMMWork * wrk )

Free work area for outprob_cd_nbest().

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 232 of file outprob.c.

Referenced by outprob_free().

LOGPROB outprob_cd	(	HMMWork *	wrk,
		int	t,
		CD_State_Set *	lset,
		HTK_Param *	param
	)

Compute the log output probability of a pseudo state set.

Parameters:

	wrk	[i/o] HMM computation work area
	t	[in] input frame
	lset	[in] pseudo state set
	param	[in] input parameter data

Returns:: the computed log output probability.

Definition at line 344 of file outprob.c.

Referenced by next_word(), outprob(), and start_word().

boolean gms_init ( HMMWork * wrk )

Initialize the GMS related functions and data.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: TRUE on success, FALSE on failure.

Definition at line 283 of file gms.c.

Referenced by outprob_init().

boolean gms_prepare	(	HMMWork *	wrk,
		int	framenum
	)

Setup GMS parameters for next input.

Parameters:

	wrk	[i/o] HMM computation work area
	framenum	[in] length of next input in frames

Returns:: TRUE on success, FALSE on failure.

Definition at line 330 of file gms.c.

Referenced by outprob_prepare().

void gms_free ( HMMWork * wrk )

Free GMS related work areas.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 366 of file gms.c.

Referenced by outprob_free().

LOGPROB gms_state ( HMMWork * wrk )

Get HMM State probability of current state with Gaussiam Mixture Selection.

If the GMS HMM score of the corresponding basephone is below the N-best, the triphone score will not be computed, and the score of the GMS HMM will be returned instead as a fallback score. Else, the precise triphone will be computed and returned.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: the state output probability score in log10.

Definition at line 394 of file gms.c.

Referenced by outprob_init().

void gms_gprune_init ( HMMWork * wrk )

Initialization of GMS HMM likelihood computation.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 43 of file gms_gprune.c.

Referenced by gms_init().

void gms_gprune_prepare ( HMMWork * wrk )

Prepare GMS HMM computation for the next speech input.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 55 of file gms_gprune.c.

Referenced by gms_prepare().

void gms_gprune_free ( HMMWork * wrk )

Free GMS related work area.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 70 of file gms_gprune.c.

Referenced by gms_free().

void compute_gs_scores ( HMMWork * wrk )

Main function to compute all the GMS HMM states in a frame with the input vectore specified by OP_vec.

This function assumes that this will be called for sequencial frame, since it utilizes the result of previous frame for faster pruning.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 202 of file gms_gprune.c.

Referenced by do_gms().

LOGPROB calc_mix ( HMMWork * wrk )

Compute the output probability of current state OP_State.

No codebook-level cache is done.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: the output probability of the state OP_State in log10

Definition at line 41 of file calc_mix.c.

Referenced by outprob_init().

boolean calc_tied_mix_init ( HMMWork * wrk )

Initialize codebook cache area.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: TRUE on success, FALSE on failure.

Definition at line 51 of file calc_tied_mix.c.

Referenced by outprob_init().

boolean calc_tied_mix_prepare	(	HMMWork *	wrk,
		int	framenum
	)

Setup codebook cache for the next incoming input.

Parameters:

	wrk	[i/o] HMM computation work area
	framenum	[in] length of the next input.

Returns:: TRUE on success, FALSE on failure.

Definition at line 69 of file calc_tied_mix.c.

Referenced by outprob_prepare().

void calc_tied_mix_free ( HMMWork * wrk )

Free work area for tied-mixture calculation.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 133 of file calc_tied_mix.c.

Referenced by outprob_free().

LOGPROB calc_tied_mix ( HMMWork * wrk )

Compute the output probability of current state OP_State on tied-mixture model.

This function assumes that the OP_state is assigned to a tied-mixture codebook. Here the output probability of Gaussian mixture component referred by OP_state is consulted to the book level cache, and if not computed yet on that input frame time, it will be computed here.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: the computed output probability in log10.

Definition at line 154 of file calc_tied_mix.c.

Referenced by outprob_init().

int cache_push	(	HMMWork *	wrk,
		int	id,
		LOGPROB	score,
		int	len
	)

Store a score to the current list of computed Gaussians.

Store the calculated score of a Gaussian to OP_calced_score, with its corresponding mixture id to OP_calced_id.

The OP_calced_score and OP_calced_id always holds the (OP_gprune_num)-best scores and ids. If the number of stored Gaussian from start has reached OP_gprune_num and the given score is below the bottom, it will be dropped. Else, the new score will be inserted and the bottom will be dropped from the list.

The OP_calced_score will always kept sorted by the scores.

Parameters:

	wrk	[i/o] HMM computation work area
	id	[in] mixture id of the Gaussian to store
	score	[in] score of the Gaussian to store
	len	[in] current number of stored scores in OP_calced_score

Returns:: the resulting number of stored scores in OP_calced_score.

Definition at line 88 of file gprune_common.c.

Referenced by gprune_beam(), gprune_heu(), and gprune_safe().

LOGPROB compute_g_base	(	HMMWork *	wrk,
		HTK_HMM_Dens *	binfo
	)

Calculate probability of a Gaussian density against input vector on OP_vec.

Parameters:

	wrk	[i/o] HMM computation work area
	binfo	[in] a Gaussian density

Returns:: the output log probability.

Definition at line 59 of file gprune_none.c.

Referenced by gprune_beam(), gprune_heu(), gprune_none(), and gprune_safe().

boolean gprune_none_init ( HMMWork * wrk )

Initialize and setup work area for Gaussian computation.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: TRUE on success, FALSE on failure.

Definition at line 86 of file gprune_none.c.

Referenced by outprob_init().

void gprune_none_free ( HMMWork * wrk )

Free gprune_none related work area.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 104 of file gprune_none.c.

Referenced by outprob_init().

void gprune_none	(	HMMWork *	wrk,
		HTK_HMM_Dens **	g,
		int	num,
		int *	last_id
	)

Compute a set of Gaussians with no pruning.

The calculated scores will be stored to OP_calced_score, with its corresponding mixture id to OP_calced_id. The number of calculated mixtures is also stored in OP_calced_num.

This can be called from calc_tied_mix() or calc_mix().

Parameters:

	wrk	[i/o] HMM computation work area
	g	[in] set of Gaussian densities to compute the output probability.
	num	[in] length of above
	last_id	[in] ID list of N-best mixture in previous input frame, or NULL if not exist

Definition at line 126 of file gprune_none.c.

Referenced by outprob_init().

LOGPROB compute_g_safe	(	HMMWork *	wrk,
		HTK_HMM_Dens *	binfo,
		LOGPROB	thres
	)

Calculate probability with safe pruning.

Calculate probability of a Gaussian toward OP_vec, performing pruning using the scholar threshold.

Parameters:

	wrk	[i/o] HMM computation work area
	binfo	[in] Gaussian density
	thres	[in] threshold

Returns:: the output log probability.

Definition at line 76 of file gprune_safe.c.

Referenced by gprune_beam(), gprune_heu(), and gprune_safe().

boolean gprune_safe_init ( HMMWork * wrk )

Initialize and setup work area for Gaussian pruning by safe algorithm.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: TRUE on success, FALSE on failure.

Definition at line 107 of file gprune_safe.c.

Referenced by outprob_init().

void gprune_safe_free ( HMMWork * wrk )

Free gprune_safe related work area.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 127 of file gprune_safe.c.

Referenced by outprob_init().

void gprune_safe	(	HMMWork *	wrk,
		HTK_HMM_Dens **	g,
		int	gnum,
		int *	last_id
	)

Compute a set of Gaussians with safe pruning.

If the N-best mixtures in the previous frame is specified in last_id, They are first computed to set the initial threshold. After that, the rest of the Gaussians will be computed with the thresholds to drop unpromising Gaussians from computation at early stage of likelihood computation. If the computation of a Gaussian reached to the end, the threshold will be updated to always hold the likelihood of current N-best score.

The calculated scores will be stored to OP_calced_score, with its corresponding mixture id to OP_calced_id. These are done by calling cache_push(). The number of calculated mixtures is also stored in OP_calced_num.

This can be called from calc_tied_mix() or calc_mix().

Parameters:

	wrk	[i/o] HMM computation work area
	g	[in] set of Gaussian densities to compute the output probability
	gnum	[in] length of above
	last_id	[in] ID list of N-best mixture in previous input frame, or NULL if not exist

Definition at line 159 of file gprune_safe.c.

Referenced by outprob_init().

boolean gprune_heu_init ( HMMWork * wrk )

Initialize and setup work area for Gaussian pruning by heuristic algorithm.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: TRUE on success, FALSE on failure.

Definition at line 237 of file gprune_heu.c.

Referenced by outprob_init().

void gprune_heu_free ( HMMWork * wrk )

Free gprune_heu related work area.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 259 of file gprune_heu.c.

Referenced by outprob_init().

void gprune_heu	(	HMMWork *	wrk,
		HTK_HMM_Dens **	g,
		int	gnum,
		int *	last_id
	)

Compute a set of Gaussians with heuristic pruning.

If the N-best mixtures in the previous frame is specified in last_id, They are first computed to get the maximum value for each dimension. After that, the rest of the Gaussians will be computed using the maximum values as heuristics of uncomputed dimensions to drop unpromising Gaussians from computation at early stage of likelihood computation. If the last_id is not specified (typically at the first frame of the input), a safe pruning as same as one in gprune_safe.c will be applied.

This can be called from calc_tied_mix() or calc_mix().

Parameters:

	wrk	[i/o] HMM computation work area
	g	[in] set of Gaussian densities to compute the output probability
	gnum	[in] length of above
	last_id	[in] ID list of N-best mixture in previous input frame, or NULL if not exist

Definition at line 293 of file gprune_heu.c.

Referenced by outprob_init().

boolean gprune_beam_init ( HMMWork * wrk )

Initialize and setup work area for Gaussian pruning by beam algorithm.

Parameters:

wrk

[i/o] HMM computation work area

Returns:: TRUE on success, FALSE on failure.

Definition at line 234 of file gprune_beam.c.

Referenced by outprob_init().

void gprune_beam_free ( HMMWork * wrk )

Free gprune_beam related work area.

Parameters:

wrk

[i/o] HMM computation work area

Definition at line 256 of file gprune_beam.c.

Referenced by outprob_init().

void gprune_beam	(	HMMWork *	wrk,
		HTK_HMM_Dens **	g,
		int	gnum,
		int *	last_id
	)

Compute a set of Gaussians with beam pruning.

If the N-best mixtures in the previous frame is specified in last_id, They are first computed to set the thresholds for each dimension. After that, the rest of the Gaussians will be computed with those dimension thresholds to drop unpromising Gaussians from computation at early stage of likelihood computation. If the last_id is not specified (typically at the first frame of the input), a safe pruning as same as one in gprune_safe.c will be applied.

This can be called from calc_tied_mix() or calc_mix().

Parameters:

	wrk	[i/o] HMM computation work area
	g	[in] set of Gaussian densities to compute the output probability
	gnum	[in] length of above
	last_id	[in] ID list of N-best mixture in previous input frame, or NULL if not exist

Definition at line 289 of file gprune_beam.c.

Referenced by outprob_init().

Generated on Tue Dec 18 16:01:36 2007 for Julius by

1.5.4


Data Structures
struct	MIXCACHE
	A component of per-codebook probability cache while search. More...
struct	HMMWork
	Work area and cache for HMM computation. More...
Defines
#define	TMBEAMWIDTH 5.0
	Score beam offset for GPRUNE_SEL_BEAM.
Enumerations
enum	{ GPRUNE_SEL_UNDEF, GPRUNE_SEL_NONE, GPRUNE_SEL_SAFE, GPRUNE_SEL_HEURISTIC, GPRUNE_SEL_BEAM }
	Symbols to specify which Gaussian pruning algorithm to use. More...
Functions
void	make_log_tbl ()
	Generate a value tables of $\log (1+e^x)$ .
LOGPROB	addlog (LOGPROB x, LOGPROB y)
	Rapid computation of $\log (e^x + e^y)$ .
LOGPROB	addlog_array (LOGPROB *x, int n)
	Rapid computation of $\log (\sum_{i=1}^N e^{x_i})$ .
boolean	outprob_init (HMMWork wrk, HTK_HMM_INFO hmminfo, HTK_HMM_INFO *gshmm, int gms_num, int gprune_method, int gprune_mixnum)
	Initialize and setup acoustic computation functions.
boolean	outprob_prepare (HMMWork *wrk, int framenum)
	Prepare for the next input of given frame length.
void	outprob_free (HMMWork *wrk)
	Free all work area for outprob computation.
boolean	outprob_cache_init (HMMWork *wrk)
	Initialize the cache data, should be called once on startup.
boolean	outprob_cache_prepare (HMMWork *wrk)
	Prepare cache for the next input, by clearing the existing cache.
void	outprob_cache_free (HMMWork *wrk)
	Free work area for cache.
LOGPROB	outprob_state (HMMWork wrk, int t, HTK_HMM_State stateinfo, HTK_Param *param)
	Compute output probability of a state.
void	outprob_cd_nbest_init (HMMWork *wrk, int num)
	Initialize work area for outprob_cd_nbest().
void	outprob_cd_nbest_free (HMMWork *wrk)
	Free work area for outprob_cd_nbest().
LOGPROB	outprob_cd (HMMWork wrk, int t, CD_State_Set lset, HTK_Param *param)
	Compute the log output probability of a pseudo state set.
boolean	gms_init (HMMWork *wrk)
	Initialize the GMS related functions and data.
boolean	gms_prepare (HMMWork *wrk, int framelen)
	Setup GMS parameters for next input.
void	gms_free (HMMWork *wrk)
	Free GMS related work areas.
LOGPROB	gms_state (HMMWork *wrk)
	Get HMM State probability of current state with Gaussiam Mixture Selection.
void	gms_gprune_init (HMMWork *wrk)
	Initialization of GMS HMM likelihood computation.
void	gms_gprune_prepare (HMMWork *wrk)
	Prepare GMS HMM computation for the next speech input.
void	gms_gprune_free (HMMWork *wrk)
	Free GMS related work area.
void	compute_gs_scores (HMMWork *wrk)
	Main function to compute all the GMS HMM states in a frame with the input vectore specified by OP_vec.
LOGPROB	calc_mix (HMMWork *wrk)
	Compute the output probability of current state OP_State.
boolean	calc_tied_mix_init (HMMWork *wrk)
	Initialize codebook cache area.
boolean	calc_tied_mix_prepare (HMMWork *wrk, int framenum)
	Setup codebook cache for the next incoming input.
void	calc_tied_mix_free (HMMWork *wrk)
	Free work area for tied-mixture calculation.
LOGPROB	calc_tied_mix (HMMWork *wrk)
	Compute the output probability of current state OP_State on tied-mixture model.
int	cache_push (HMMWork *wrk, int id, LOGPROB score, int len)
	Store a score to the current list of computed Gaussians.
LOGPROB	compute_g_base (HMMWork wrk, HTK_HMM_Dens binfo)
	Calculate probability of a Gaussian density against input vector on OP_vec.
boolean	gprune_none_init (HMMWork *wrk)
	Initialize and setup work area for Gaussian computation.
void	gprune_none_free (HMMWork *wrk)
	Free gprune_none related work area.
void	gprune_none (HMMWork wrk, HTK_HMM_Dens g, int num, int last_id)
	Compute a set of Gaussians with no pruning.
LOGPROB	compute_g_safe (HMMWork wrk, HTK_HMM_Dens binfo, LOGPROB thres)
	Calculate probability with safe pruning.
boolean	gprune_safe_init (HMMWork *wrk)
	Initialize and setup work area for Gaussian pruning by safe algorithm.
void	gprune_safe_free (HMMWork *wrk)
	Free gprune_safe related work area.
void	gprune_safe (HMMWork wrk, HTK_HMM_Dens g, int gnum, int last_id)
	Compute a set of Gaussians with safe pruning.
boolean	gprune_heu_init (HMMWork *wrk)
	Initialize and setup work area for Gaussian pruning by heuristic algorithm.
void	gprune_heu_free (HMMWork *wrk)
	Free gprune_heu related work area.
void	gprune_heu (HMMWork wrk, HTK_HMM_Dens g, int gnum, int last_id)
	Compute a set of Gaussians with heuristic pruning.
boolean	gprune_beam_init (HMMWork *wrk)
	Initialize and setup work area for Gaussian pruning by beam algorithm.
void	gprune_beam_free (HMMWork *wrk)
	Free gprune_beam related work area.
void	gprune_beam (HMMWork wrk, HTK_HMM_Dens g, int gnum, int last_id)
	Compute a set of Gaussians with beam pruning.