libsent/src/hmminfo/check_hmm_restriction.c File Reference

Check if the given HMM definition file can be used. More...

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

Go to the source code of this file.

Functions
boolean	htk_hmm_has_several_arc_on_edge (HTK_HMM_INFO *hmminfo)
	Return TRUE if it has more than one arc from initial state, or to the final state.
static boolean	trans_ok_p (HTK_HMM_Trans *t)
	Scan the transition matrix to test the ristrictions.
boolean	check_hmm_limit (HTK_HMM_Data *dt)
	Check if the transition matrix conforms the ristrictions of Julius.
boolean	check_all_hmm_limit (HTK_HMM_INFO *hmminfo)
	Check all the HMM definitions in a HTK HMM definition data.
boolean	is_skippable_model (HTK_HMM_Data *d)
	Check if the model has direct transition from initial state to final state, skipping all the output state.

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Detailed Description

Check if the given HMM definition file can be used.

TRANSITION RESTRICTIONS:

• for HTK and Julius:
  • no arc to initial state
  • no arc from final state

• Normal version of Julius:
  • should have at least one output state
  • allow only one arc from initial state
  • allow only one arc to final state (internal skip/loop is allowed)

• Multipath version of Julius:
  • should have at least one output state

In multipath version, all the transitions including model-skipping transition is allowed. However, in normal version, their transition is restricted as above.

If such transition is found, Julius output warning and proceed by modifying transition to suite for the restriction.

Author:

Akinobu LEE

Date:

Tue Feb 15 19:00:58 2005

Revision

1.1.1.1

Definition in file check_hmm_restriction.c.

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Function Documentation

boolean htk_hmm_has_several_arc_on_edge

(

HTK_HMM_INFO *

hmminfo

)

Return TRUE if it has more than one arc from initial state, or to the final state.

In such case, Julius should be run in multi-path version.

Parameters:

hmminfo

[in] HMM definition

Returns:

TRUE if has, or FALSE if not exist.

Definition at line 63 of file check_hmm_restriction.c.

Referenced by rdhmmdef(), and read_binhmm().

static boolean trans_ok_p

(

HTK_HMM_Trans *

t

)

[static]

Scan the transition matrix to test the ristrictions.

Parameters:

t

[in] a transition matrix to be tested

Returns:

0 if it conforms, 1 if unacceptable transition was found and modification forced, 3 if totally unsupported transition as included and cannot by handled.

Definition at line 109 of file check_hmm_restriction.c.

Referenced by check_hmm_limit().

boolean check_hmm_limit

(

HTK_HMM_Data *

dt

)

Check if the transition matrix conforms the ristrictions of Julius.

Parameters:

dt

[in] HTK HMM model to check.

Returns:

TRUE on success, FALSE if the check failed.

Definition at line 174 of file check_hmm_restriction.c.

Referenced by check_all_hmm_limit().

boolean check_all_hmm_limit

(

HTK_HMM_INFO *

hmminfo

)

Check all the HMM definitions in a HTK HMM definition data.

Parameters:

hmminfo

[in] HTK HMM data to check.

Returns:

TRUE if there was no bad models, FALSE if at least one model is bad.

Definition at line 198 of file check_hmm_restriction.c.

Referenced by rdhmmdef().

boolean is_skippable_model

(

HTK_HMM_Data *

d

)

Check if the model has direct transition from initial state to final state, skipping all the output state.

Parameters:

d

[in] logical HMM

Returns:

TRUE if it has direct transition from initial state to final state, that is, this is a "skippable" model. Otherwise, return FALSE.

Definition at line 232 of file check_hmm_restriction.c.

Referenced by print_hmmdef_info().

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