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tools/openfst-1.6.7/src/bin/fstdeterminize-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Determinizes an FST.
#include <cstring>
#include <memory>
#include <string>
#include <fst/flags.h>
#include <fst/script/determinize.h>
#include <fst/script/getters.h>
DECLARE_double(delta);
DECLARE_string(weight);
DECLARE_int64(nstate);
DECLARE_int64(subsequential_label);
DECLARE_string(det_type);
DECLARE_bool(increment_subsequential_label);
int fstdeterminize_main(int argc, char **argv) {
namespace s = fst::script;
using fst::DeterminizeType;
using fst::script::FstClass;
using fst::script::VectorFstClass;
using fst::script::WeightClass;
string usage = "Determinizes an FST.
Usage: ";
usage += argv[0];
usage += " [in.fst [out.fst]]
";
std::set_new_handler(FailedNewHandler);
SET_FLAGS(usage.c_str(), &argc, &argv, true);
if (argc > 3) {
ShowUsage();
return 1;
}
DeterminizeType det_type;
if (!s::GetDeterminizeType(FLAGS_det_type, &det_type)) {
LOG(ERROR) << argv[0] << ": Unknown or unsupported determinization type: "
<< FLAGS_det_type;
return 1;
}
const string in_name = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : "";
const string out_name = argc > 2 ? argv[2] : "";
std::unique_ptr<FstClass> ifst(FstClass::Read(in_name));
if (!ifst) return 1;
VectorFstClass ofst(ifst->ArcType());
const auto weight_threshold =
FLAGS_weight.empty() ? WeightClass::Zero(ifst->WeightType())
: WeightClass(ifst->WeightType(), FLAGS_weight);
const s::DeterminizeOptions opts(FLAGS_delta, weight_threshold, FLAGS_nstate,
FLAGS_subsequential_label, det_type,
FLAGS_increment_subsequential_label);
s::Determinize(*ifst, &ofst, opts);
return !ofst.Write(out_name);
}
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