fstreweight-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Reweights an FST.
#include <cstring>
#include <memory>
#include <string>
#include <vector>
#include <fst/flags.h>
#include <fst/script/getters.h>
#include <fst/script/reweight.h>
#include <fst/script/text-io.h>
DECLARE_bool(to_final);
int fstreweight_main(int argc, char **argv) {
namespace s = fst::script;
using fst::script::MutableFstClass;
using fst::script::WeightClass;
string usage = "Reweights an FST.\n\n Usage: ";
usage += argv[0];
usage += " in.fst potential.txt [out.fst]\n";
std::set_new_handler(FailedNewHandler);
SET_FLAGS(usage.c_str(), &argc, &argv, true);
if (argc < 3 || argc > 4) {
ShowUsage();
return 1;
}
const string in_name = argv[1];
const string potentials_name = argv[2];
const string out_name = argc > 3 ? argv[3] : "";
std::unique_ptr<MutableFstClass> fst(MutableFstClass::Read(in_name, true));
if (!fst) return 1;
std::vector<WeightClass> potential;
if (!s::ReadPotentials(fst->WeightType(), potentials_name, &potential)) {
return 1;
}
s::Reweight(fst.get(), potential, s::GetReweightType(FLAGS_to_final));
return !fst->Write(out_name);
}