// See www.openfst.org for extensive documentation on this weighted
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// finite-state transducer library.
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#include <fst/compat.h>
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#include <fst/extensions/linear/linear-fst.h>
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#include <fst/extensions/linear/loglinear-apply.h>
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#include <fst/vector-fst.h>
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#include <fst/flags.h>
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#include <fst/log.h>
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DEFINE_bool(normalize, true, "Normalize to get posterior");
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int main(int argc, char **argv) {
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string usage =
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"Applies an FST to another FST, treating the second as a log-linear "
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"model.\n\n "
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"Usage: ";
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usage += argv[0];
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usage += " in.fst linear.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 || argc > 4) {
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ShowUsage();
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return 1;
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}
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string in_name = strcmp(argv[1], "-") != 0 ? argv[1] : "";
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string linear_name = (argc > 2 && (strcmp(argv[2], "-") != 0)) ? argv[2] : "";
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string out_name = argc > 3 ? argv[3] : "";
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if (in_name.empty() && linear_name.empty()) {
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LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input.";
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return 1;
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}
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fst::StdFst *ifst1 = fst::StdFst::Read(in_name);
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if (!ifst1) return 1;
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fst::StdFst *ifst2 = fst::StdFst::Read(linear_name);
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if (!ifst2) return 1;
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fst::StdVectorFst ofst;
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LogLinearApply(*ifst1, *ifst2, &ofst, FLAGS_normalize);
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ofst.Write(out_name);
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return 0;
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}
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