/usr/include/irstlm/shiftlm.h is in libirstlm-dev 5.80.03-2.
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
******************************************************************************/
// Non linear Shift based interpolated LMs
class shiftone: public mdiadaptlm
{
protected:
int prunethresh;
double beta;
public:
shiftone(char* ngtfile,int depth=0,int prunefreq=0,TABLETYPE tt=SHIFTBETA_B);
int train();
int discount(ngram ng,int size,double& fstar,double& lambda,int cv=0);
~shiftone() {}
};
class shiftbeta: public mdiadaptlm
{
protected:
int prunethresh;
double* beta;
public:
shiftbeta(char* ngtfile,int depth=0,int prunefreq=0,double beta=-1,TABLETYPE tt=SHIFTBETA_B);
int train();
int discount(ngram ng,int size,double& fstar,double& lambda,int cv=0);
~shiftbeta() {
delete [] beta;
}
};
class symshiftbeta: public shiftbeta
{
public:
symshiftbeta(char* ngtfile,int depth=0,int prunefreq=0,double beta=-1):
shiftbeta(ngtfile,depth,prunefreq,beta) {}
int discount(ngram ng,int size,double& fstar,double& lambda,int cv=0);
};
class mshiftbeta: public mdiadaptlm
{
protected:
int prunethresh;
double beta[3][MAX_NGRAM];
ngramtable* tb[MAX_NGRAM];
double oovsum;
public:
mshiftbeta(char* ngtfile,int depth=0,int prunefreq=0,TABLETYPE tt=MSHIFTBETA_B);
int train();
int discount(ngram ng,int size,double& fstar,double& lambda,int cv=0);
~mshiftbeta() {}
int mfreq(ngram& ng,int l) {
return (l<lmsize()?getfreq(ng.link,ng.pinfo,1):ng.freq);
}
};
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