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
|
#ifndef LATTICE_H_
#define LATTICE_H_
#include <string>
#include <vector>
#include "sparse_vector.h"
#include "wordid.h"
#include "array2d.h"
class Lattice;
struct LatticeTools {
static bool LooksLikePLF(const std::string &line);
static void ConvertTextToLattice(const std::string& text, Lattice* pl);
static void ConvertTextOrPLF(const std::string& text_or_plf, Lattice* pl);
};
struct LatticeArc {
WordID label;
SparseVector<double> features;
int dist2next;
LatticeArc() : label(), features(), dist2next() {}
LatticeArc(WordID w, const SparseVector<double>& f, int i) : label(w), features(f), dist2next(i) {}
};
class Lattice : public std::vector<std::vector<LatticeArc> > {
friend void LatticeTools::ConvertTextOrPLF(const std::string& text_or_plf, Lattice* pl);
friend void LatticeTools::ConvertTextToLattice(const std::string& text, Lattice* pl);
public:
Lattice() {}
explicit Lattice(size_t t, const std::vector<LatticeArc>& v = std::vector<LatticeArc>()) :
std::vector<std::vector<LatticeArc>>(t, v) {}
int Distance(int from, int to) const {
if (dist_.empty())
return (to - from);
return dist_(from, to);
}
private:
void ComputeDistances();
Array2D<int> dist_;
};
inline bool IsSentence(const Lattice& in) {
bool res = true;
for (auto& alt : in)
if (alt.size() > 1) { res = false; break; }
return res;
}
#endif
|
