libsent/src/phmm/gms_gprune.c File Reference

Calculate the GMS monophone HMM for Gaussian Mixture Selection using Gaussian pruning. More...

#include <sent/stddefs.h>
#include <sent/htk_hmm.h>
#include <sent/htk_param.h>
#include <sent/hmm.h>
#include <sent/gprune.h>
#include "globalvars.h"

Include dependency graph for gms_gprune.c:

Go to the source code of this file.

Defines
#define	GS_MAX_PROB
	Compute only max for GS states.
#define	LAST_BEST
	Enable beam pruning.
#define	BEAM_OFFSET   10.0
	Beam offset, used when BEAM enabled.
#define	GS_MAX_PROB
	Compute only max for GS states.
Functions
void	gms_gprune_init (HTK_HMM_INFO *hmminfo, int gsset_num)
void	gms_gprune_prepare ()
void	gms_gprune_free ()
static LOGPROB	calc_contprob_with_safe_pruning (HTK_HMM_Dens *binfo, LOGPROB thres)
static LOGPROB	compute_g_max (HTK_HMM_State *stateinfo, int last_maxi, int *maxi_ret)
void	compute_gs_scores (GS_SET *gsset, int gsset_num, LOGPROB *scores_ret)
Variables
static int	my_gsset_num
	num of gsset states (local copy)
static int *	last_max_id
	maximum mixture id of last call for each states

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Detailed Description

Calculate the GMS monophone HMM for Gaussian Mixture Selection using Gaussian pruning.

Author:

Akinobu LEE

Date:

Thu Feb 17 15:05:08 2005

Revision

1.6

Definition in file gms_gprune.c.

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Define Documentation

#define LAST_BEST

Enable beam pruning.

Compute last best Gaussians first

Definition at line 33 of file gms_gprune.c.

Referenced by compute_gs_scores().

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Function Documentation

void gms_gprune_init	(	HTK_HMM_INFO *	hmminfo,
		int	gsset_num
	)

Initialization of GMS HMM likelihood computation.

Parameters:

	hmminfo	[in] GMS HMM definition
	gsset_num	[in] number of states in GMS HMM

Definition at line 60 of file gms_gprune.c.

Referenced by gms_init().

void gms_gprune_prepare

(

)

Prepare GMS HMM computation for the next speech input.

Definition at line 75 of file gms_gprune.c.

Referenced by gms_prepare().

void gms_gprune_free

(

)

Free GMS related work area.

Definition at line 88 of file gms_gprune.c.

Referenced by gms_free().

static LOGPROB calc_contprob_with_safe_pruning	(	HTK_HMM_Dens *	binfo,
		LOGPROB	thres
	)			[static]

Compute only max by safe pruning

Parameters:

	binfo	[in] Gaussian density
	thres	[in] constant pruning threshold

Returns:

the computed likelihood.

Definition at line 108 of file gms_gprune.c.

Referenced by compute_g_max().

static LOGPROB compute_g_max	(	HTK_HMM_State *	stateinfo,
		int	last_maxi,
		int *	maxi_ret
	)			[static]

Compute log output likelihood of a state. Only maximum Gaussian will be computed.

Parameters:

	stateinfo	[in] HMM state to compute
	last_maxi	[in] the mixture id that got the maximum value at the previous frame, or -1 if not exist.
	maxi_ret	[out] tue mixture id that get the maximum value at this call.

Returns:

the log likelihood.

Definition at line 214 of file gms_gprune.c.

Referenced by compute_gs_scores().

void compute_gs_scores	(	GS_SET *	gsset,
		int	gsset_num,
		LOGPROB *	scores_ret
	)

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:

	gsset	[in] list of GMS HMM state set.
	gsset_num	[in] length of above
	scores_ret	[out] array of scores for each GMS HMM state

Definition at line 306 of file gms_gprune.c.

Referenced by do_gms().

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