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
98
99
100
101
102
103
104
105
106
107
108
109
110
|
// 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 DECODINGHMM_INC
#define DECODINGHMM_INC
#include "general.h"
#include "Distribution.h"
#include "HMM.h"
namespace Torch {
/* This structure is used to store all HMM state information
required for decoding. Each state contains a list of successor
states and associated transition probabilities.
@author Darren Moore (moore@idiap.ch)
*/
typedef struct
{
Distribution *distribution ;
short emission_prob_vec_index ;
short n_successors ;
short *successor_states ;
real *suc_log_trans_probs ;
} DecodingHMMState ;
/** This class contains all HMM information required for decoding. Most information
is embedded in the states themselves (DecodingHMMState structures). The DecodingHMM
can be created a number of ways to facilitate compatibility with the Torch HMM class
and to allow easy concatenation of models (eg. when constructing word models from
phoneme models).
@author Darren Moore (moore@idiap.ch)
*/
class DecodingHMM
{
public:
short n_states ;
DecodingHMMState **states ;
/* Constructors / destructor */
DecodingHMM() ;
/// Converts a Torch HMM instance to a DecodingHMM representation. The Torch HMM
/// class contains a lot of member variables used in training that are not
/// required when decoding, as well as a full transition matrix.
DecodingHMM( HMM *orig_model , short *emis_prob_vec_indices ) ;
/// Concatenates all elements in the array of DecodingHMM instances into a single
/// DecodingHMM. Component models that have initial-final state transitions are ok.
DecodingHMM( int n_models , DecodingHMM **models ) ;
/// Creates a DecodingHMM using the distributions in 'states_' and the log
/// transition probabilties in 'log_trans_probs_'.
DecodingHMM( short n_states_ , Distribution **states_ , real **log_trans_probs_ ,
short *emis_prob_vec_indices ) ;
virtual ~DecodingHMM() ;
/* Methods */
/// Internal function to merge component models into a big HMM
void mergeModels( int n_models , DecodingHMM **models ) ;
/// Configures successor state information for the state denoted by 'state'.
void setupSuccessorStates( DecodingHMMState *state , short n_successors_ ,
short *sucessor_states_ , real *log_trans_probs_ ) ;
/// Initialises the state denoted by 'state' with a Distribution and
/// optionally an index into the vector of emission probabilities.
void initState( DecodingHMMState *state , Distribution *distribution_ ,
short emission_prob_vec_index_=-1 ) ;
#ifdef DEBUG
void outputText() ;
#endif
} ;
}
#endif
|
