tuple-weight.h
4.23 KB
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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Tuple weight set operation definitions.
#ifndef FST_TUPLE_WEIGHT_H_
#define FST_TUPLE_WEIGHT_H_
#include <algorithm>
#include <array>
#include <functional>
#include <string>
#include <vector>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/weight.h>
namespace fst {
// n-tuple weight, element of the n-th Cartesian power of W.
template <class W, size_t n>
class TupleWeight {
public:
using ReverseWeight = TupleWeight<typename W::ReverseWeight, n>;
using Weight = W;
using Index = size_t;
TupleWeight(const TupleWeight &other) { values_ = other.values_; }
TupleWeight<W, n> &operator=(const TupleWeight<W, n> &other) {
values_ = other.values_;
return *this;
}
template <class Iterator>
TupleWeight(Iterator begin, Iterator end) {
std::copy(begin, end, values_.begin());
}
explicit TupleWeight(const W &weight = W::Zero()) { values_.fill(weight); }
// Initialize component `index` to `weight`; initialize all other components
// to `default_weight`
TupleWeight(Index index, const W &weight, const W &default_weight)
: TupleWeight(default_weight) {
values_[index] = weight;
}
static const TupleWeight<W, n> &Zero() {
static const TupleWeight<W, n> zero(W::Zero());
return zero;
}
static const TupleWeight<W, n> &One() {
static const TupleWeight<W, n> one(W::One());
return one;
}
static const TupleWeight<W, n> &NoWeight() {
static const TupleWeight<W, n> no_weight(W::NoWeight());
return no_weight;
}
constexpr static size_t Length() { return n; }
std::istream &Read(std::istream &istrm) {
for (size_t i = 0; i < n; ++i) values_[i].Read(istrm);
return istrm;
}
std::ostream &Write(std::ostream &ostrm) const {
for (size_t i = 0; i < n; ++i) values_[i].Write(ostrm);
return ostrm;
}
bool Member() const {
return std::all_of(values_.begin(), values_.end(),
std::mem_fn(&W::Member));
}
size_t Hash() const {
uint64 hash = 0;
for (size_t i = 0; i < n; ++i) hash = 5 * hash + values_[i].Hash();
return size_t(hash);
}
TupleWeight<W, n> Quantize(float delta = kDelta) const {
TupleWeight<W, n> weight;
for (size_t i = 0; i < n; ++i) {
weight.values_[i] = values_[i].Quantize(delta);
}
return weight;
}
ReverseWeight Reverse() const {
TupleWeight<W, n> w;
for (size_t i = 0; i < n; ++i) w.values_[i] = values_[i].Reverse();
return w;
}
const W &Value(size_t i) const { return values_[i]; }
void SetValue(size_t i, const W &w) { values_[i] = w; }
private:
std::array<W, n> values_;
};
template <class W, size_t n>
inline bool operator==(const TupleWeight<W, n> &w1,
const TupleWeight<W, n> &w2) {
for (size_t i = 0; i < n; ++i) {
if (w1.Value(i) != w2.Value(i)) return false;
}
return true;
}
template <class W, size_t n>
inline bool operator!=(const TupleWeight<W, n> &w1,
const TupleWeight<W, n> &w2) {
for (size_t i = 0; i < n; ++i) {
if (w1.Value(i) != w2.Value(i)) return true;
}
return false;
}
template <class W, size_t n>
inline bool ApproxEqual(const TupleWeight<W, n> &w1,
const TupleWeight<W, n> &w2, float delta = kDelta) {
for (size_t i = 0; i < n; ++i) {
if (!ApproxEqual(w1.Value(i), w2.Value(i), delta)) return false;
}
return true;
}
template <class W, size_t n>
inline std::ostream &operator<<(std::ostream &strm,
const TupleWeight<W, n> &w) {
CompositeWeightWriter writer(strm);
writer.WriteBegin();
for (size_t i = 0; i < n; ++i) writer.WriteElement(w.Value(i));
writer.WriteEnd();
return strm;
}
template <class W, size_t n>
inline std::istream &operator>>(std::istream &strm, TupleWeight<W, n> &w) {
CompositeWeightReader reader(strm);
reader.ReadBegin();
W v;
// Reads first n-1 elements.
static_assert(n > 0, "Size must be positive.");
for (size_t i = 0; i < n - 1; ++i) {
reader.ReadElement(&v);
w.SetValue(i, v);
}
// Reads n-th element.
reader.ReadElement(&v, true);
w.SetValue(n - 1, v);
reader.ReadEnd();
return strm;
}
} // namespace fst
#endif // FST_TUPLE_WEIGHT_H_