fstrandgen-main.cc
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// See www.openfst.org for extensive documentation on this weighted
// finite-state transducer library.
//
// Generates random paths through an FST.
#include <cstring>
#include <memory>
#include <string>
#include <fst/flags.h>
#include <fst/log.h>
#include <fst/script/getters.h>
#include <fst/script/randgen.h>
DECLARE_int32(max_length);
DECLARE_int32(npath);
DECLARE_int32(seed);
DECLARE_string(select);
DECLARE_bool(weighted);
DECLARE_bool(remove_total_weight);
int fstrandgen_main(int argc, char **argv) {
namespace s = fst::script;
using fst::script::FstClass;
using fst::script::VectorFstClass;
string usage = "Generates random paths through an FST.\n\n Usage: ";
usage += argv[0];
usage += " [in.fst [out.fst]]\n";
std::set_new_handler(FailedNewHandler);
SET_FLAGS(usage.c_str(), &argc, &argv, true);
if (argc > 3) {
ShowUsage();
return 1;
}
VLOG(1) << argv[0] << ": Seed = " << FLAGS_seed;
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());
s::RandArcSelection ras;
if (!s::GetRandArcSelection(FLAGS_select, &ras)) {
LOG(ERROR) << argv[0] << ": Unknown or unsupported select type "
<< FLAGS_select;
return 1;
}
s::RandGen(*ifst, &ofst, FLAGS_seed,
fst::RandGenOptions<s::RandArcSelection>(
ras, FLAGS_max_length, FLAGS_npath, FLAGS_weighted,
FLAGS_remove_total_weight));
return !ofst.Write(out_name);
}