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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
|
/***********************************************************************
Moses - statistical machine translation system
Copyright (C) 2006-2011 University of Edinburgh
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
***********************************************************************/
#pragma once
#include <iostream>
#include <ostream>
#include <set>
#include <vector>
#include <cstdlib>
#include <boost/functional/hash.hpp>
#include "TypeDef.h"
namespace Moses
{
class AlignmentInfoCollection;
/** Collection of non-terminal alignment pairs, ordered by source index.
* Usually held by a TargetPhrase to map non-terms in hierarchical/syntax models
*/
class AlignmentInfo
{
friend std::ostream& operator<<(std::ostream &, const AlignmentInfo &);
friend struct AlignmentInfoOrderer;
friend struct AlignmentInfoHasher;
friend class AlignmentInfoCollection;
friend class VW;
public:
typedef std::set<std::pair<size_t,size_t> > CollType;
typedef std::vector<size_t> NonTermIndexMap;
typedef CollType::const_iterator const_iterator;
const_iterator begin() const {
return m_collection.begin();
}
const_iterator end() const {
return m_collection.end();
}
void Add(size_t sourcePos, size_t targetPos) {
m_collection.insert(std::pair<size_t, size_t>(sourcePos, targetPos));
}
/** Provides a map from target-side to source-side non-terminal indices.
* The target-side index should be the rule symbol index (COUNTING terminals).
* The index returned is the rule non-terminal index (IGNORING terminals).
*/
const NonTermIndexMap &GetNonTermIndexMap() const {
return m_nonTermIndexMap;
}
/** Like GetNonTermIndexMap but the return value is the symbol index (i.e.
* the index counting both terminals and non-terminals) */
const NonTermIndexMap &GetNonTermIndexMap2() const {
return m_nonTermIndexMap2;
}
const CollType &GetAlignments() const {
return m_collection;
}
std::set<size_t> GetAlignmentsForSource(size_t sourcePos) const;
std::set<size_t> GetAlignmentsForTarget(size_t targetPos) const;
size_t GetSize() const {
return m_collection.size();
}
std::vector< const std::pair<size_t,size_t>* >
GetSortedAlignments(WordAlignmentSort SortOrder) const;
std::vector<size_t> GetSourceIndex2PosMap() const;
bool operator==(const AlignmentInfo& rhs) const {
return m_collection == rhs.m_collection &&
m_nonTermIndexMap == rhs.m_nonTermIndexMap;
}
private:
//! AlignmentInfo objects should only be created by an AlignmentInfoCollection
explicit AlignmentInfo(const std::set<std::pair<size_t,size_t> > &pairs);
explicit AlignmentInfo(const std::vector<unsigned char> &aln);
// used only by VW to load word alignment between sentences
explicit AlignmentInfo(const std::string &str);
void BuildNonTermIndexMaps();
CollType m_collection;
NonTermIndexMap m_nonTermIndexMap;
NonTermIndexMap m_nonTermIndexMap2;
};
/** Define an arbitrary strict weak ordering between AlignmentInfo objects
* for use by AlignmentInfoCollection.
*/
struct AlignmentInfoOrderer {
bool operator()(const AlignmentInfo &a, const AlignmentInfo &b) const {
if (a.m_collection == b.m_collection) {
return a.m_nonTermIndexMap < b.m_nonTermIndexMap;
} else {
return a.m_collection < b.m_collection;
}
}
};
/**
* Hashing functoid
**/
struct AlignmentInfoHasher {
size_t operator()(const AlignmentInfo& a) const {
size_t seed = 0;
boost::hash_combine(seed,a.m_collection);
boost::hash_combine(seed,a.m_nonTermIndexMap);
return seed;
}
};
inline size_t hash_value(const AlignmentInfo& a)
{
static AlignmentInfoHasher hasher;
return hasher(a);
}
}
|
