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/* ====================================================================
* Copyright (c) 1999-2004 Carnegie Mellon University. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
*
* THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ====================================================================
*
*/
/*
* fsg_model.h -- Word-level finite state graph
*
* **********************************************
* CMU ARPA Speech Project
*
* Copyright (c) 2003 Carnegie Mellon University.
* ALL RIGHTS RESERVED.
* **********************************************
*/
#ifndef __FSG_MODEL_H__
#define __FSG_MODEL_H__
/* System headers. */
#include <stdio.h>
#include <string.h>
/* SphinxBase headers. */
#include <prim_type.h>
#include <glist.h>
#include <logmath.h>
#include <hash_table.h>
#include <bitvec.h>
#include <listelem_alloc.h>
#include <sphinxbase_export.h>
/*
* A single transition in the FSG.
*/
typedef struct fsg_link_s {
int32 from_state;
int32 to_state;
int32 logs2prob; /**< log(transition probability)*lw */
int32 wid; /**< Word-ID; <0 if epsilon or null transition */
} fsg_link_t;
/* Access macros */
#define fsg_link_from_state(l) ((l)->from_state)
#define fsg_link_to_state(l) ((l)->to_state)
#define fsg_link_wid(l) ((l)->wid)
#define fsg_link_logs2prob(l) ((l)->logs2prob)
/**
* Word level FSG definition.
* States are simply integers 0..n_state-1.
* A transition emits a word and has a given probability of being taken.
* There can also be null or epsilon transitions, with no associated emitted
* word.
*/
typedef struct fsg_model_s {
int refcount; /**< Reference count. */
char *name; /**< A unique string identifier for this FSG */
int32 n_word; /**< Number of unique words in this FSG */
int32 n_word_alloc; /**< Number of words allocated in vocab */
char **vocab; /**< Vocabulary for this FSG. */
bitvec_t *silwords; /**< Indicates which words are silence/fillers. */
bitvec_t *altwords; /**< Indicates which words are pronunciation alternates. */
logmath_t *lmath; /**< Pointer to log math computation object. */
int32 n_state; /**< number of states in FSG */
int32 start_state; /**< Must be in the range [0..n_state-1] */
int32 final_state; /**< Must be in the range [0..n_state-1] */
float32 lw; /**< Language weight that's been applied to transition
logprobs */
glist_t **trans; /**< trans[i][j] = glist of non-epsilon transitions or
links (fsg_link_t *) from state i to state j,
if any; NULL if none. */
fsg_link_t ***null_trans; /**< null_trans[i][j] = epsilon or null link
from state i to j, if any; NULL if none.
(At most one null transition between two
given states.) */
listelem_alloc_t *link_alloc; /**< Allocator for FSG links. */
} fsg_model_t;
/* Access macros */
#define fsg_model_name(f) ((f)->name)
#define fsg_model_n_state(f) ((f)->n_state)
#define fsg_model_start_state(f) ((f)->start_state)
#define fsg_model_final_state(f) ((f)->final_state)
#define fsg_model_log(f,p) logmath_log((f)->lmath, p)
#define fsg_model_lw(f) ((f)->lw)
#define fsg_model_trans(f,i,j) ((f)->trans[i][j])
#define fsg_model_null_trans(f,i,j) ((f)->null_trans[i][j])
#define fsg_model_n_word(f) ((f)->n_word)
#define fsg_model_word_str(f,wid) (wid == -1 ? "(NULL)" : (f)->vocab[wid])
/**
* Have silence transitions been added?
*/
#define fsg_model_has_sil(f) ((f)->silwords != NULL)
/**
* Have alternate word transitions been added?
*/
#define fsg_model_has_alt(f) ((f)->altwords != NULL)
#define fsg_model_is_filler(f,wid) \
(fsg_model_has_sil(f) ? bitvec_is_set((f)->silwords, wid) : FALSE)
#define fsg_model_is_alt(f,wid) \
(fsg_model_has_alt(f) ? bitvec_is_set((f)->altwords, wid) : FALSE)
/**
* Create a new FSG.
*/
SPHINXBASE_EXPORT
fsg_model_t *fsg_model_init(char const *name, logmath_t *lmath,
float32 lw, int32 n_state);
/**
* Read a word FSG from the given file and return a pointer to the structure
* created. Return NULL if any error occurred.
*
* File format:
*
* <pre>
* Any number of comment lines; ignored
* FSG_BEGIN [<fsgname>]
* N <#states>
* S <start-state ID>
* F <final-state ID>
* T <from-state> <to-state> <prob> [<word-string>]
* T ...
* ... (any number of state transitions)
* FSG_END
* Any number of comment lines; ignored
* </pre>
*
* The FSG spec begins with the line containing the keyword FSG_BEGIN.
* It has an optional fsg name string. If not present, the FSG has the empty
* string as its name.
*
* Following the FSG_BEGIN declaration is the number of states, the start
* state, and the final state, each on a separate line. States are numbered
* in the range [0 .. <numberofstate>-1].
*
* These are followed by all the state transitions, each on a separate line,
* and terminated by the FSG_END line. A state transition has the given
* probability of being taken, and emits the given word. The word emission
* is optional; if word-string omitted, it is an epsilon or null transition.
*
* Comments can also be embedded within the FSG body proper (i.e. between
* FSG_BEGIN and FSG_END): any line with a # character in col 1 is treated
* as a comment line.
*
* Return value: a new fsg_model_t structure if the file is successfully
* read, NULL otherwise.
*/
SPHINXBASE_EXPORT
fsg_model_t *fsg_model_readfile(const char *file, logmath_t *lmath, float32 lw);
/**
* Like fsg_model_readfile(), but from an already open stream.
*/
SPHINXBASE_EXPORT
fsg_model_t *fsg_model_read(FILE *fp, logmath_t *lmath, float32 lw);
/**
* Retain ownership of an FSG.
*
* @return Pointer to retained FSG.
*/
SPHINXBASE_EXPORT
fsg_model_t *fsg_model_retain(fsg_model_t *fsg);
/**
* Free the given word FSG.
*
* @return new reference count (0 if freed completely)
*/
SPHINXBASE_EXPORT
int fsg_model_free(fsg_model_t *fsg);
/**
* Add a word to the FSG vocabulary.
*
* @return Word ID for this new word.
*/
SPHINXBASE_EXPORT
int fsg_model_word_add(fsg_model_t *fsg, char const *word);
/**
* Look up a word in the FSG vocabulary.
*
* @return Word ID for this word
*/
SPHINXBASE_EXPORT
int fsg_model_word_id(fsg_model_t *fsg, char const *word);
/**
* Add the given transition to the FSG transition matrix.
*
* Duplicates (i.e., two transitions between the same states, with the
* same word label) are flagged and only the highest prob retained.
*/
SPHINXBASE_EXPORT
void fsg_model_trans_add(fsg_model_t * fsg,
int32 from, int32 to, int32 logp, int32 wid);
/**
* Add a null transition between the given states.
*
* There can be at most one null transition between the given states;
* duplicates are flagged and only the best prob retained. Transition
* probs must be <= 1 (i.e., logprob <= 0).
*
* @return 1 if a new transition was added, 0 if the prob of an existing
* transition was upgraded; -1 if nothing was changed.
*/
SPHINXBASE_EXPORT
int32 fsg_model_null_trans_add(fsg_model_t * fsg, int32 from, int32 to, int32 logp);
/**
* Obtain transitive closure of null transitions in the given FSG.
*
* @param nulls List of null transitions, or NULL to find them automatically.
* @return Updated list of null transitions.
*/
SPHINXBASE_EXPORT
glist_t fsg_model_null_trans_closure(fsg_model_t * fsg, glist_t nulls);
/**
* Add silence word transitions to each state in given FSG.
*
* @param state state to add a self-loop to, or -1 for all states.
* @param silprob probability of silence transition.
*/
SPHINXBASE_EXPORT
int fsg_model_add_silence(fsg_model_t * fsg, char const *silword,
int state, float32 silprob);
/**
* Add alternate pronunciation transitions for a word in given FSG.
*/
SPHINXBASE_EXPORT
int fsg_model_add_alt(fsg_model_t * fsg, char const *baseword,
char const *altword);
/**
* Write FSG to a file.
*/
SPHINXBASE_EXPORT
void fsg_model_write(fsg_model_t *fsg, FILE *fp);
/**
* Write FSG to a file.
*/
SPHINXBASE_EXPORT
void fsg_model_writefile(fsg_model_t *fsg, char const *file);
#endif /* __FSG_MODEL_H__ */
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