// 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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// Reweights 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 <vector>
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#include <fst/flags.h>
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#include <fst/script/getters.h>
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#include <fst/script/reweight.h>
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#include <fst/script/text-io.h>
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DECLARE_bool(to_final);
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int fstreweight_main(int argc, char **argv) {
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namespace s = fst::script;
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using fst::script::MutableFstClass;
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using fst::script::WeightClass;
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string usage = "Reweights an FST.\n\n Usage: ";
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usage += argv[0];
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usage += " in.fst potential.txt [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 || argc > 4) {
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ShowUsage();
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return 1;
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}
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const string in_name = argv[1];
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const string potentials_name = argv[2];
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const string out_name = argc > 3 ? argv[3] : "";
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std::unique_ptr<MutableFstClass> fst(MutableFstClass::Read(in_name, true));
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if (!fst) return 1;
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std::vector<WeightClass> potential;
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if (!s::ReadPotentials(fst->WeightType(), potentials_name, &potential)) {
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return 1;
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}
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s::Reweight(fst.get(), potential, s::GetReweightType(FLAGS_to_final));
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return !fst->Write(out_name);
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}
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