Implementation detail of full GMM computation with integer value of log likelihood.
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#include <string.h>
#include <math.h>
#include "bio.h"
#include "vector.h"
#include "matrix.h"
#include "logs3.h"
#include "cont_mgau.h"
Macros | |
#define | MGAU_PARAM_VERSION "1.0" /* Sphinx-3 file format version for mean/var */ |
#define | MGAU_MIXW_VERSION "1.0" /* Sphinx-3 file format version for mixw */ |
Functions | |
int32 | mgau_mean_reload (mgau_model_t *g, const char *mean_file_name) |
int32 | mgau_dump (mgau_model_t *g, int32 type) |
int32 | mgau_var_nzvec_floor (mgau_model_t *g, float64 floor) |
mgau_model_t * | mgau_init (const char *meanfile, const char *varfile, float64 varfloor, const char *mixwfile, float64 mixwfloor, int32 precomp, const char *senmgau, int32 comp_type, logmath_t *logmath) |
int32 | mgau_comp_eval (mgau_model_t *g, int32 s, float32 *x, int32 *score) |
int32 | mgau_eval (mgau_model_t *g, int32 m, int32 *active, float32 *x, int32 fr, int32 update_best_id) |
void | mgau_free (mgau_model_t *g) |
Implementation detail of full GMM computation with integer value of log likelihood.
#define MGAU_MIXW_VERSION "1.0" /* Sphinx-3 file format version for mixw */ |
#define MGAU_PARAM_VERSION "1.0" /* Sphinx-3 file format version for mean/var */ |
int32 mgau_comp_eval | ( | mgau_model_t * | g, |
int32 | s, | ||
float32 * | x, | ||
int32 * | score | ||
) |
Like mgau_eval(), but return the scores of the individual components, instead of combining them into a senone score.
g | In: Set of mixture Gaussians |
s | In: Mixture being considered |
x | In: Input vector being compared to the components |
score | Out: Array of scores for each component |
References mgau_model_t::distfloor, mgau_model_t::logmath, mgau_t::lrd, mgau_t::mean, mgau_model_t::mgau, mgau_veclen, mgau_t::n_comp, and mgau_t::var.
int32 mgau_dump | ( | mgau_model_t * | g, |
int32 | type | ||
) |
A routine that dump all mean and variance parameters of a set of gaussian distribution.
g | In: Set of mixture Gaussians |
type | In: type of output, MGAU_MEAN for mean or MGAU_VAR for variance. |
References mgau_t::mean, mgau_model_t::mgau, MGAU_MEAN, mgau_n_comp, mgau_n_mgau, MGAU_VAR, mgau_veclen, and mgau_t::var.
int32 mgau_eval | ( | mgau_model_t * | g, |
int32 | m, | ||
int32 * | active, | ||
float32 * | x, | ||
int32 | fr, | ||
int32 | update_best_id | ||
) |
Compute the log likelihood of a Gaussian mixture model in fixed-point. Notice that within the program, the Gaussian distribution is computed using floating point. But log-add is done in fixed point (usually by table lookup).
g | In: The entire mixture Gaussian model |
m | In: The chosen mixture in the model (i.e., g->mgau[m]) |
active | In: An optional, -1 terminated list of active component indices; if non-NULL, only the specified components are used in the evaluation. |
x | In: Input observation vector (of length g->veclen). |
fr | In: Frame number where GMM m is updated |
update_best_id | In: Whether the best index for the GMM will be updated or not |
References mgau_t::bstidx, mgau_t::bstscr, mgau_model_t::comp_type, mgau_model_t::mgau, mgau_veclen, MIX_INT_FLOAT_COMP, NO_BSTIDX, S3_LOGPROB_ZERO, and mgau_t::updatetime.
void mgau_free | ( | mgau_model_t * | g | ) |
ARCHAN, I noticed this program because of Ricky's comment. In 2004, a very useful tool called valgrind started to be available for Linux. This tool allows me to pick up a lot of memory problems easily.
g | In: A set of model to free |
References mgau_t::fullvar, mgau_t::lrd, mgau_t::mean, mgau_model_t::mgau, mgau_t::mixw, mgau_t::mixw_f, and mgau_t::var.
mgau_model_t* mgau_init | ( | const char * | meanfile, |
const char * | varfile, | ||
float64 | varfloor, | ||
const char * | mixwfile, | ||
float64 | mixwfloor, | ||
int32 | precomp, | ||
const char * | senmgau, | ||
int32 | comp_type, | ||
logmath_t * | logmath | ||
) |
At the moment, S3 models have the same # of means in each codebook and 1 var/mean
meanfile | In: File containing means of mixture gaussians |
varfile | In: File containing variances of mixture gaussians |
varfloor | In: Floor value applied to variances; e.g., 0.0001 |
mixwfile | In: File containing mixture weights |
mixwfloor | In: Floor value for mixture weights; e.g., 0.0000001 |
precomp | In: If TRUE, create and precompute mgau_t.lrd and also transform each var value to 1/(2*var). (If FALSE, one cannot use the evaluation routines provided here.) |
senmgau | In: type of the gaussians distribution, .cont. or .semi. FIX me! This is confusing! |
comp_type | In: Type of computation in this set of gaussian mixtures. |
int32 mgau_mean_reload | ( | mgau_model_t * | g, |
const char * | mean_file_name | ||
) |
reload the mean file
g | In/Out: The GMM |
mean_file_name | In: file name for the mean file. |
References mgau_model_t::mgau.
int32 mgau_var_nzvec_floor | ( | mgau_model_t * | g, |
float64 | floor | ||
) |
Floor any variance vector that is non-zero (vector).
g | In: A mixture of Gaussian components |
floor | In: The floor value |
References mgau_model_t::mgau, mgau_n_comp, mgau_n_mgau, mgau_veclen, mgau_t::var, vector_is_zero(), and mgau_model_t::verbose.