// See www.openfst.org for extensive documentation on this weighted
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// finite-state transducer library.
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//
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// Generates random paths through an FST.
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#include <cstring>
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#include <memory>
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#include <string>
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#include <fst/flags.h>
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#include <fst/log.h>
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#include <fst/script/getters.h>
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#include <fst/script/randgen.h>
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DECLARE_int32(max_length);
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DECLARE_int32(npath);
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DECLARE_int32(seed);
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DECLARE_string(select);
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DECLARE_bool(weighted);
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DECLARE_bool(remove_total_weight);
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int fstrandgen_main(int argc, char **argv) {
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namespace s = fst::script;
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using fst::script::FstClass;
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using fst::script::VectorFstClass;
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string usage = "Generates random paths through an FST.\n\n Usage: ";
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usage += argv[0];
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usage += " [in.fst [out.fst]]\n";
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std::set_new_handler(FailedNewHandler);
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SET_FLAGS(usage.c_str(), &argc, &argv, true);
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if (argc > 3) {
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ShowUsage();
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return 1;
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}
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VLOG(1) << argv[0] << ": Seed = " << FLAGS_seed;
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const string in_name = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : "";
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const string out_name = argc > 2 ? argv[2] : "";
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std::unique_ptr<FstClass> ifst(FstClass::Read(in_name));
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if (!ifst) return 1;
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VectorFstClass ofst(ifst->ArcType());
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s::RandArcSelection ras;
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if (!s::GetRandArcSelection(FLAGS_select, &ras)) {
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LOG(ERROR) << argv[0] << ": Unknown or unsupported select type "
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<< FLAGS_select;
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return 1;
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}
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s::RandGen(*ifst, &ofst, FLAGS_seed,
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fst::RandGenOptions<s::RandArcSelection>(
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ras, FLAGS_max_length, FLAGS_npath, FLAGS_weighted,
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FLAGS_remove_total_weight));
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return !ofst.Write(out_name);
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}
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