/usr/include/irstlm/interplm.h is in libirstlm-dev 6.00.05-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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IrstLM: IRST Language Model Toolkit
Copyright (C) 2006 Marcello Federico, ITC-irst Trento, Italy
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
******************************************************************************/
// Basic Interpolated LM class
#ifndef MF_INTERPLM_H
#define MF_INTERPLM_H
#define SHIFT_BETA 1
#define SHIFT_ONE 2
#define SHIFT_ZERO 3
#define LINEAR_STB 4
#define LINEAR_WB 5
#define LINEAR_GT 6
#define MIXTURE 7
#define MOD_SHIFT_BETA 8
#define IMPROVED_SHIFT_BETA 9
#define KNESER_NEY 10
#define IMPROVED_KNESER_NEY 11
class interplm:public ngramtable
{
int lms;
double epsilon; //Bayes smoothing
int unismooth; //0 Bayes, 1 Witten Bell
int prune_singletons;
int prune_top_singletons;
int* prune_freq_threshold;
public:
int backoff; //0 interpolation, 1 Back-off
interplm(char* ngtfile,int depth=0,TABLETYPE tt=FULL);
virtual ~interplm();
int prunesingletons(int flag=-1) {
return (flag==-1?prune_singletons:prune_singletons=flag);
}
int prunetopsingletons(int flag=-1) {
return (flag==-1?prune_top_singletons:prune_top_singletons=flag);
}
inline bool prune_ngram(int lev, int freq)
{
return (freq > prune_freq_threshold[lev])?false:true;
}
void init_prune_ngram(int sz);
void delete_prune_ngram();
void set_prune_ngram(int lev, int val);
void set_prune_ngram(char* values);
void print_prune_ngram();
void gencorrcounts();
void gensuccstat();
virtual int dub() {
return dict->dub();
}
virtual int dub(int value) {
return dict->dub(value);
}
int setusmooth(int v=0) {
return unismooth=v;
}
double setepsilon(double v=1.0) {
return epsilon=v;
}
ngramtable *unitbl;
void trainunigr();
double unigrWB(ngram ng);
virtual double unigr(ngram ng){ return unigrWB(ng); };
double zerofreq(int lev);
inline int lmsize() const {
return lms;
}
inline int obswrd() const {
return dict->size();
}
virtual int train() {
return 0;
}
virtual void adapt(char* /* unused parameter: ngtfile */, double /* unused parameter: w */) {}
virtual double prob(ngram /* unused parameter: ng */,int /* unused parameter: size */) {
return 0.0;
}
virtual double boprob(ngram /* unused parameter: ng */,int /* unused parameter: size */) {
return 0.0;
}
void test_ngt(ngramtable& ngt,int sz=0,bool backoff=false,bool checkpr=false);
void test_txt(char *filename,int sz=0,bool backoff=false,bool checkpr=false,char* outpr=NULL);
void test(char* filename,int sz,bool backoff=false,bool checkpr=false,char* outpr=NULL);
virtual int discount(ngram /* unused parameter: ng */,int /* unused parameter: size */,double& /* unused parameter: fstar */ ,double& /* unused parameter: lambda */,int /* unused parameter: cv*/=0) {
return 0;
}
virtual int savebin(char* /* unused parameter: filename */,int /* unused parameter: lmsize=2 */) {
return 0;
}
virtual int netsize() {
return 0;
}
void lmstat(int level) {
stat(level);
}
};
#endif
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