// 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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// Two FSTS are isomorphic (equal up to state and arc re-ordering) iff their
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// exit status is zero. FSTs should be deterministic when viewed as unweighted
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// automata.
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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/isomorphic.h>
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DECLARE_double(delta);
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int fstisomorphic_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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string usage =
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"Two FSTs are isomorphic iff the exit status is zero.\n\n Usage: ";
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usage += argv[0];
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usage += " in1.fst in2.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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const string in1_name = strcmp(argv[1], "-") == 0 ? "" : argv[1];
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const string in2_name = strcmp(argv[2], "-") == 0 ? "" : argv[2];
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if (in1_name.empty() && in2_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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std::unique_ptr<FstClass> ifst1(FstClass::Read(in1_name));
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if (!ifst1) return 1;
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std::unique_ptr<FstClass> ifst2(FstClass::Read(in2_name));
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if (!ifst2) return 1;
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bool result = s::Isomorphic(*ifst1, *ifst2, FLAGS_delta);
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if (!result) VLOG(1) << "FSTs are not isomorphic";
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return result ? 0 : 2;
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}
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