tag_crfsuite_tagger Struct Reference

CRFSuite tagger interface. More...

List of all members.

Public Attributes
void *	internal
	Pointer to the internal data (internal use only).
int	nref
	Reference counter (internal use only).
int(*	addref )(crfsuite_tagger_t *tagger)
	Increment the reference counter.
int(*	release )(crfsuite_tagger_t *tagger)
	Decrement the reference counter.
int(*	set )(crfsuite_tagger_t *tagger, crfsuite_instance_t *inst)
	Set an instance to the tagger.
int(*	length )(crfsuite_tagger_t *tagger)
	Obtain the number of items in the current instance.
int(*	viterbi )(crfsuite_tagger_t *tagger, int *labels, floatval_t *ptr_score)
	Find the Viterbi label sequence.
int(*	score )(crfsuite_tagger_t *tagger, int *path, floatval_t *ptr_score)
	Compute the score of a label sequence.
int(*	lognorm )(crfsuite_tagger_t *tagger, floatval_t *ptr_norm)
	Compute the log of the partition factor (normalization constant).
int(*	marginal_point )(crfsuite_tagger_t *tagger, int l, int t, floatval_t *ptr_prob)
	Compute the marginal probability of a label at a position.
int(*	marginal_path )(crfsuite_tagger_t *tagger, const int *path, int begin, int end, floatval_t *ptr_prob)
	Compute the marginal probability of a partial label sequence.

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Detailed Description

CRFSuite tagger interface.

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Member Data Documentation

int(* tag_crfsuite_tagger::addref)(crfsuite_tagger_t *tagger)

Increment the reference counter.

Parameters:

tagger

The pointer to this tagger instance.

Returns:

int The reference count after this increment.

int(* tag_crfsuite_tagger::length)(crfsuite_tagger_t *tagger)

Obtain the number of items in the current instance.

Parameters:

tagger

The pointer to this tagger instance.

Returns:

int The number of items of the instance set by set() function.

int The status code.

int(* tag_crfsuite_tagger::lognorm)(crfsuite_tagger_t *tagger, floatval_t *ptr_norm)

Compute the log of the partition factor (normalization constant).

Parameters:

tagger	The pointer to this tagger instance.
ptr_score	The pointer to a float variable that receives the logarithm of the partition factor.

Returns:

int The status code.

int(* tag_crfsuite_tagger::marginal_path)(crfsuite_tagger_t *tagger, const int *path, int begin, int end, floatval_t *ptr_prob)

Compute the marginal probability of a partial label sequence.

Parameters:

tagger	The pointer to this tagger instance.
path	The partial label sequence.
begin	The start position of the partial label sequence.
end	The last+1 position of the partial label sequence.
ptr_prob	The pointer to a float variable that receives the marginal probability.

Returns:

int The status code.

int(* tag_crfsuite_tagger::marginal_point)(crfsuite_tagger_t *tagger, int l, int t, floatval_t *ptr_prob)

Compute the marginal probability of a label at a position.

This function computes P(y_t = l | x), the probability when y_t is the label (l).

Parameters:

tagger	The pointer to this tagger instance.
l	The label.
t	The position.
ptr_prob	The pointer to a float variable that receives the marginal probability.

Returns:

int The status code.

int(* tag_crfsuite_tagger::release)(crfsuite_tagger_t *tagger)

Decrement the reference counter.

Parameters:

tagger

The pointer to this tagger instance.

Returns:

int The reference count after this operation.

int(* tag_crfsuite_tagger::score)(crfsuite_tagger_t *tagger, int *path, floatval_t *ptr_score)

Compute the score of a label sequence.

Parameters:

tagger	The pointer to this tagger instance.
path	The label sequence.
ptr_score	The pointer to a float variable that receives the score of the label sequence.

Returns:

int The status code.

int(* tag_crfsuite_tagger::set)(crfsuite_tagger_t *tagger, crfsuite_instance_t *inst)

Set an instance to the tagger.

Parameters:

tagger	The pointer to this tagger instance.
inst	The item sequence to be tagged.

Returns:

int The status code.

int(* tag_crfsuite_tagger::viterbi)(crfsuite_tagger_t *tagger, int *labels, floatval_t *ptr_score)

Find the Viterbi label sequence.

Parameters:

tagger	The pointer to this tagger instance.
labels	The label array that receives the Viterbi label sequence. The number of elements in the array must be no smaller than the number of item.
ptr_score	The pointer to a float variable that receives the score of the Viterbi label sequence.

Returns:

int The status code.