addlog.c File Reference

Rapid addition of log values. More...

#include <sent/stddefs.h>
#include <sent/hmm.h>

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Defines

#define TBLSIZE   500000

Table size (precision depends on this).

#define VRANGE   15

Must be larger than -LOG_ADDMIN.

#define TMAG   33333.3333

TBLSIZE / VRANGE.

Functions

void make_log_tbl ()

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

LOGPROB addlog (LOGPROB x, LOGPROB y)

LOGPROB addlog_array (LOGPROB *a, int n)

Variables

static LOGPROB tbl [TBLSIZE]

Table of $\log (1+e^x)$ .

Detailed Description

Rapid addition of log values.

Author:: Akinobu LEE

Date:: Thu Feb 17 13:23:50 2005

Revision: 1.1.1.1

Definition in file addlog.c.

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 40 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 66 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 98 of file addlog.c.
Referenced by calc_mix(), calc_tied_mix(), and gmm_calc_mix().

Generated on Tue Mar 28 16:19:27 2006 for Julius by

1.4.2


Defines
#define	TBLSIZE 500000
	Table size (precision depends on this).
#define	VRANGE 15
	Must be larger than -LOG_ADDMIN.
#define	TMAG 33333.3333
	TBLSIZE / VRANGE.
Functions
void	make_log_tbl ()
	Generate a value tables of $\log (1+e^x)$ .
LOGPROB	addlog (LOGPROB x, LOGPROB y)
LOGPROB	addlog_array (LOGPROB *a, int n)
Variables
static LOGPROB	tbl [TBLSIZE]
	Table of $\log (1+e^x)$ .