/usr/include/torch/LanguageModel.h is in libtorch3-dev 3.1-2.1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | // Copyright (C) 2003--2004 Darren Moore (moore@idiap.ch)
//
// This file is part of Torch 3.1.
//
// 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.
// 3. The name of the author may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 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 THE AUTHOR 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.
#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
|