PocketSphinx  5prealpha
ms_senone.h File Reference

(Sphinx 3.0 specific) multiple streams senones. More...

#include <sphinxbase/err.h>
#include <sphinxbase/ckd_alloc.h>
#include <sphinxbase/cmd_ln.h>
#include <sphinxbase/logmath.h>
#include "ms_gauden.h"
#include "bin_mdef.h"

Go to the source code of this file.

Data Structures

struct  senone_t
 8-bit senone PDF structure. More...
 

Typedefs

typedef uint8 senprob_t
 Senone logs3-probs, truncated to 8 bits.
 

Functions

senone_tsenone_init (gauden_t *g, char const *mixwfile, char const *mgau_mapfile, float32 mixwfloor, logmath_t *lmath, bin_mdef_t *mdef)
 Load a set of senones (mixing weights and mixture gaussian codebook mappings) from the given files. More...
 
void senone_free (senone_t *s)
 Release memory allocated by senone_init. More...
 
int32 senone_eval (senone_t *s, int id, gauden_dist_t **dist, int n_top)
 Evaluate the score for the given senone wrt to the given top N gaussian codewords. More...
 

Detailed Description

(Sphinx 3.0 specific) multiple streams senones.

used with ms_gauden.h In Sphinx 3.0 family of tools, ms_senone is used to combine the Gaussian scores. Its existence is crucial in Sphinx 3.0 because 3.0 supports both SCHMM and CDHMM. There are optimization scheme for SCHMM (e.g. compute the top-N Gaussian) that is applicable to SCHMM than CDHMM. This is wrapped in senone_eval_all.

Definition in file ms_senone.h.

Function Documentation

int32 senone_eval ( senone_t s,
int  id,
gauden_dist_t **  dist,
int  n_top 
)

Evaluate the score for the given senone wrt to the given top N gaussian codewords.

Returns
senone score (in logs3 domain).
Parameters
idIn: senone for which score desired
distIn: top N codewords and densities for all features, to be combined into senone score. IE, dist[f][i] = i-th best <codeword,density> for feaure f
n_topIn: Length of dist[f], for each f
void senone_free ( senone_t s)

Release memory allocated by senone_init.

In: The senone_t to free

Definition at line 341 of file ms_senone.c.

References senone_t::featscr, senone_t::lmath, senone_t::mgau, and senone_t::pdf.

senone_t* senone_init ( gauden_t g,
char const *  mixwfile,
char const *  mgau_mapfile,
float32  mixwfloor,
logmath_t *  lmath,
bin_mdef_t mdef 
)

Load a set of senones (mixing weights and mixture gaussian codebook mappings) from the given files.

Normalize weights for each codebook, apply the given floor, convert PDF values to logs3 domain and quantize to 8-bits.

Returns
pointer to senone structure created. Caller MUST NOT change its contents.
Parameters
gIn: codebooks
mixwfileIn: mixing weights file
mgau_mapfileIn: file specifying mapping from each senone to mixture gaussian codebook. If NULL all senones map to codebook 0
mixwfloorIn: Floor value for senone weights
lmathIn: log math computation
mdefIn: model definition

Definition at line 275 of file ms_senone.c.

References senone_t::featscr, senone_t::lmath, senone_t::mgau, senone_t::mixwfloor, senone_t::n_gauden, gauden_t::n_mgau, senone_t::n_sen, and SENSCR_SHIFT.