product-weight.h
3.23 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
// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Product weight set and associated semiring operation definitions.
#ifndef FST_PRODUCT_WEIGHT_H_
#define FST_PRODUCT_WEIGHT_H_
#include <string>
#include <utility>
#include <fst/pair-weight.h>
#include <fst/weight.h>
namespace fst {
// Product semiring: W1 * W2.
template <class W1, class W2>
class ProductWeight : public PairWeight<W1, W2> {
public:
using ReverseWeight =
ProductWeight<typename W1::ReverseWeight, typename W2::ReverseWeight>;
ProductWeight() {}
explicit ProductWeight(const PairWeight<W1, W2> &weight)
: PairWeight<W1, W2>(weight) {}
ProductWeight(W1 w1, W2 w2)
: PairWeight<W1, W2>(std::move(w1), std::move(w2)) {}
static const ProductWeight &Zero() {
static const ProductWeight zero(PairWeight<W1, W2>::Zero());
return zero;
}
static const ProductWeight &One() {
static const ProductWeight one(PairWeight<W1, W2>::One());
return one;
}
static const ProductWeight &NoWeight() {
static const ProductWeight no_weight(PairWeight<W1, W2>::NoWeight());
return no_weight;
}
static const string &Type() {
static const string *const type =
new string(W1::Type() + "_X_" + W2::Type());
return *type;
}
static constexpr uint64 Properties() {
return W1::Properties() & W2::Properties() &
(kLeftSemiring | kRightSemiring | kCommutative | kIdempotent);
}
ProductWeight Quantize(float delta = kDelta) const {
return ProductWeight(PairWeight<W1, W2>::Quantize(delta));
}
ReverseWeight Reverse() const {
return ReverseWeight(PairWeight<W1, W2>::Reverse());
}
};
template <class W1, class W2>
inline ProductWeight<W1, W2> Plus(const ProductWeight<W1, W2> &w1,
const ProductWeight<W1, W2> &w2) {
return ProductWeight<W1, W2>(Plus(w1.Value1(), w2.Value1()),
Plus(w1.Value2(), w2.Value2()));
}
template <class W1, class W2>
inline ProductWeight<W1, W2> Times(const ProductWeight<W1, W2> &w1,
const ProductWeight<W1, W2> &w2) {
return ProductWeight<W1, W2>(Times(w1.Value1(), w2.Value1()),
Times(w1.Value2(), w2.Value2()));
}
template <class W1, class W2>
inline ProductWeight<W1, W2> Divide(const ProductWeight<W1, W2> &w1,
const ProductWeight<W1, W2> &w2,
DivideType typ = DIVIDE_ANY) {
return ProductWeight<W1, W2>(Divide(w1.Value1(), w2.Value1(), typ),
Divide(w1.Value2(), w2.Value2(), typ));
}
// This function object generates weights by calling the underlying generators
// for the template weight types, like all other pair weight types. This is
// intended primarily for testing.
template <class W1, class W2>
class WeightGenerate<ProductWeight<W1, W2>> :
public WeightGenerate<PairWeight<W1, W2>> {
public:
using Weight = ProductWeight<W1, W2>;
using Generate = WeightGenerate<PairWeight<W1, W2>>;
explicit WeightGenerate(bool allow_zero = true) : Generate(allow_zero) {}
Weight operator()() const { return Weight(Generate::operator()()); }
};
} // namespace fst
#endif // FST_PRODUCT_WEIGHT_H_