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#include "lattice.h"
#include "tdict.h"
#include "hg_io.h"
using namespace std;
static const int kUNREACHABLE = 99999999;
void Lattice::ComputeDistances() {
const int n = this->size() + 1;
dist_.resize(n, n, kUNREACHABLE);
for (int i = 0; i < this->size(); ++i) {
const vector<LatticeArc>& alts = (*this)[i];
for (int j = 0; j < alts.size(); ++j)
dist_(i, i + alts[j].dist2next) = 1;
}
for (int k = 0; k < n; ++k) {
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
const int dp = dist_(i,k) + dist_(k,j);
if (dist_(i,j) > dp)
dist_(i,j) = dp;
}
}
}
for (int i = 0; i < n; ++i) {
int latest = kUNREACHABLE;
for (int j = n-1; j >= 0; --j) {
const int c = dist_(i,j);
if (c < kUNREACHABLE)
latest = c;
else
dist_(i,j) = latest;
}
}
// cerr << dist_ << endl;
}
bool LatticeTools::LooksLikePLF(const string &line) {
return (line.size() > 5) && (line.substr(0,4) == "((('");
}
void LatticeTools::ConvertTextToLattice(const string& text, Lattice* pl) {
Lattice& l = *pl;
vector<WordID> ids;
TD::ConvertSentence(text, &ids);
l.clear();
l.resize(ids.size());
for (int i = 0; i < l.size(); ++i)
l[i].push_back(LatticeArc(ids[i], 0.0, 1));
l.is_sentence_ = true;
}
void LatticeTools::ConvertTextOrPLF(const string& text_or_plf, Lattice* pl) {
if (LooksLikePLF(text_or_plf))
HypergraphIO::PLFtoLattice(text_or_plf, pl);
else
ConvertTextToLattice(text_or_plf, pl);
pl->ComputeDistances();
}
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