/usr/include/torch/LanguageModel.h is in libtorch3-dev 3.1-2.2.
This file is owned by root:root, with mode 0o644.
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//
// This file is part of Torch 3.1.
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#ifndef LANGUAGEMODEL_INC
#define LANGUAGEMODEL_INC
#include "general.h"
#include "DecodingHypothesis.h"
#include "Vocabulary.h"
#include "LMNGram.h"
namespace Torch {
/**
This object implements an n-gram language model. The n-gram data structures
are encapsulated in the ngram member variable (see LMNGram class). Methods
are provided to read a LM file in ARPA format or in Noway binary format.
A method is provided to calculate a LM prob (with backoff) for a given
sequence of words.
@author Darren Moore (moore@idiap.ch)
*/
class LanguageModel
{
public:
int order ;
int n_words ;
Vocabulary *vocabulary ;
LMNGram *ngram ;
real lm_scaling_factor ;
bool lm_has_start_word ;
bool lm_has_end_word ;
/* constructors / destructor */
/// Creates the language model.
/// 'order_' is the order of the LM (eg. 3 for trigram).
LanguageModel( int order_ , Vocabulary *vocabulary_ , char *lm_fname ,
real lm_scaling_factor_=1.0 ) ;
virtual ~LanguageModel() ;
/* methods */
/// Calculates the language model probability (with backoff) of the word
/// sequence stored in the hypothesis pointed to by 'word_end_hyp'.
real calcLMProb( DecodingHypothesis *word_end_hyp ) ;
/// Calculates the language model probability (with backoff) of 'next_word'
/// given the previous word sequence stored in the hypothesis pointed to
/// by 'prev_word_end_hyp'.
real calcLMProb( DecodingHypothesis *prev_word_end_hyp , int next_word ) ;
/// Creates a language model from an ARPA format file. Internal function.
void readARPA( FILE *arpa_fd ) ;
/// Creates a language model from an Noway binary LM format file. Internal function.
/// nb. Only the TR2 and NG3 types are supported (ie. trigrams).
void readNowayBin( FILE *nw_fd ) ;
#ifdef DEBUG
void outputText() ;
#endif
};
}
#endif
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