ngram_model_internal.h
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/*
* \file ngram_model_internal.h Internal structures for N-Gram models
*
* Author: David Huggins-Daines <dhuggins@cs.cmu.edu>
*/
#ifndef __NGRAM_MODEL_INTERNAL_H__
#define __NGRAM_MODEL_INTERNAL_H__
#include "sphinxbase/ngram_model.h"
#include "sphinxbase/hash_table.h"
struct ngram_model_s {
int refcount;
uint32 *n_counts;
int32 n_1g_alloc;
int32 n_words;
uint8 n;
uint8 n_classes;
uint8 writable;
uint8 flags;
logmath_t *lmath;
float32 lw;
int32 log_wip;
int32 log_zero;
char **word_str;
hash_table_t *wid;
int32 *tmp_wids;
struct ngram_class_s **classes;
struct ngram_funcs_s *funcs;
};
struct ngram_class_s {
int32 tag_wid;
int32 start_wid;
int32 n_words;
int32 *prob1;
struct ngram_hash_s {
int32 wid;
int32 prob1;
int32 next;
} *nword_hash;
int32 n_hash;
int32 n_hash_inuse;
};
#define NGRAM_MAX_ORDER 5
#define NGRAM_HASH_SIZE 128
#define NGRAM_BASEWID(wid) ((wid)&0xffffff)
#define NGRAM_CLASSID(wid) (((wid)>>24) & 0x7f)
#define NGRAM_CLASSWID(wid,classid) (((classid)<<24) | 0x80000000 | (wid))
#define NGRAM_IS_CLASSWID(wid) ((wid)&0x80000000)
#define UG_ALLOC_STEP 10
typedef struct ngram_funcs_s {
void (*free) (ngram_model_t * model);
int (*apply_weights) (ngram_model_t * model, float32 lw, float32 wip);
int32(*score) (ngram_model_t * model,
int32 wid,
int32 * history, int32 n_hist, int32 * n_used);
int32(*raw_score) (ngram_model_t * model,
int32 wid,
int32 * history, int32 n_hist, int32 * n_used);
int32(*add_ug) (ngram_model_t * model, int32 wid, int32 lweight);
void (*flush) (ngram_model_t * model);
} ngram_funcs_t;
typedef struct classdef_s {
char **words;
float32 *weights;
int32 n_words;
} classdef_t;
int32
ngram_model_init(ngram_model_t * model,
ngram_funcs_t * funcs,
logmath_t * lmath, int32 n, int32 n_unigram);
int32 read_classdef_file(hash_table_t * classes,
const char *classdef_file);
void classdef_free(classdef_t * classdef);
ngram_class_t *ngram_class_new(ngram_model_t * model, int32 tag_wid,
int32 start_wid, glist_t classwords);
void ngram_class_free(ngram_class_t * lmclass);
int32 ngram_class_prob(ngram_class_t * lmclass, int32 wid);
#endif /* __NGRAM_MODEL_INTERNAL_H__ */
hash_table.h
Hash table implementation.
logmath_t
struct logmath_s logmath_t
Integer log math computation class.
Definition logmath.h:108
ngram_model.h
N-Gram language models.
ngram_class_t
struct ngram_class_s ngram_class_t
Abstract type representing a word class in an N-Gram model.
Definition ngram_model.h:71
ngram_model_t
struct ngram_model_s ngram_model_t
Abstract type representing an N-Gram based language model.
Definition ngram_model.h:66
classdef_s
One class definition from a classdef file.
Definition ngram_model_internal.h:154
ngram_class_s::ngram_hash_s
Custom hash table for additional words.
Definition ngram_model_internal.h:89
ngram_class_s::ngram_hash_s::prob1
int32 prob1
Probability for this word.
Definition ngram_model_internal.h:91
ngram_class_s::ngram_hash_s::next
int32 next
Index of next bucket (or -1 for no collision).
Definition ngram_model_internal.h:92
ngram_class_s::ngram_hash_s::wid
int32 wid
Word ID of this bucket.
Definition ngram_model_internal.h:90
ngram_class_s
Implementation of ngram_class_t.
Definition ngram_model_internal.h:81
ngram_class_s::start_wid
int32 start_wid
Starting base word ID for this class' words.
Definition ngram_model_internal.h:83
ngram_class_s::prob1
int32 * prob1
Probability table for base words.
Definition ngram_model_internal.h:85
ngram_class_s::n_hash_inuse
int32 n_hash_inuse
Number of words in nword_hash.
Definition ngram_model_internal.h:95
ngram_class_s::n_hash
int32 n_hash
Number of buckets in nword_hash (power of 2).
Definition ngram_model_internal.h:94
ngram_class_s::tag_wid
int32 tag_wid
Base word ID for this class tag.
Definition ngram_model_internal.h:82
ngram_class_s::n_words
int32 n_words
Number of base words for this class.
Definition ngram_model_internal.h:84
ngram_funcs_s
Implementation-specific functions for operating on ngram_model_t objects.
Definition ngram_model_internal.h:110
ngram_funcs_s::raw_score
int32(* raw_score)(ngram_model_t *model, int32 wid, int32 *history, int32 n_hist, int32 *n_used)
Implementation-specific function for querying raw language model probability.
Definition ngram_model_internal.h:129
ngram_funcs_s::score
int32(* score)(ngram_model_t *model, int32 wid, int32 *history, int32 n_hist, int32 *n_used)
Implementation-specific function for querying language model score.
Definition ngram_model_internal.h:122
ngram_funcs_s::free
void(* free)(ngram_model_t *model)
Implementation-specific function for freeing an ngram_model_t.
Definition ngram_model_internal.h:114
ngram_funcs_s::apply_weights
int(* apply_weights)(ngram_model_t *model, float32 lw, float32 wip)
Implementation-specific function for applying language model weights.
Definition ngram_model_internal.h:118
ngram_funcs_s::add_ug
int32(* add_ug)(ngram_model_t *model, int32 wid, int32 lweight)
Implementation-specific function for adding unigrams.
Definition ngram_model_internal.h:143
ngram_funcs_s::flush
void(* flush)(ngram_model_t *model)
Implementation-specific function for purging N-Gram cache.
Definition ngram_model_internal.h:148
ngram_model_s
Common implementation of ngram_model_t.
Definition ngram_model_internal.h:55
ngram_model_s::lmath
logmath_t * lmath
Log-math object.
Definition ngram_model_internal.h:67
ngram_model_s::classes
struct ngram_class_s ** classes
Word class definitions.
Definition ngram_model_internal.h:74
ngram_model_s::refcount
int refcount
Reference count.
Definition ngram_model_internal.h:56
ngram_model_s::n
uint8 n
This is an n-gram model (1, 2, 3, ...).
Definition ngram_model_internal.h:62
ngram_model_s::log_wip
int32 log_wip
Log of word insertion penalty.
Definition ngram_model_internal.h:69
ngram_model_s::n_1g_alloc
int32 n_1g_alloc
Number of allocated word strings (for new word addition).
Definition ngram_model_internal.h:58
ngram_model_s::tmp_wids
int32 * tmp_wids
Temporary array of word IDs for ngram_model_get_ngram().
Definition ngram_model_internal.h:73
ngram_model_s::log_zero
int32 log_zero
Zero probability, cached here for quick lookup.
Definition ngram_model_internal.h:70
ngram_model_s::n_counts
uint32 * n_counts
Counts for 1, 2, 3, ... grams.
Definition ngram_model_internal.h:57
ngram_model_s::n_words
int32 n_words
Number of actual word strings (NOT the same as the number of unigrams, due to class words).
Definition ngram_model_internal.h:59
ngram_model_s::wid
hash_table_t * wid
Mapping of unigram names to word IDs.
Definition ngram_model_internal.h:72
ngram_model_s::lw
float32 lw
Language model scaling factor.
Definition ngram_model_internal.h:68
ngram_model_s::writable
uint8 writable
Are word strings writable?
Definition ngram_model_internal.h:64
ngram_model_s::flags
uint8 flags
Any other flags we might care about (FIXME: Merge this and writable).
Definition ngram_model_internal.h:65
ngram_model_s::funcs
struct ngram_funcs_s * funcs
Implementation-specific methods.
Definition ngram_model_internal.h:75
ngram_model_s::n_classes
uint8 n_classes
Number of classes (maximum 128).
Definition ngram_model_internal.h:63
ngram_model_s::word_str
char ** word_str
Unigram names.
Definition ngram_model_internal.h:71