// fstbin/fstdeterminizestar.cc
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// Copyright 2009-2011 Microsoft Corporation
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// See ../../COPYING for clarification regarding multiple authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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// MERCHANTABLITY OR NON-INFRINGEMENT.
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// See the Apache 2 License for the specific language governing permissions and
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// limitations under the License.
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#include "base/kaldi-common.h"
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#include "fst/fstlib.h"
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#include "fstext/determinize-star.h"
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#include "fstext/fstext-utils.h"
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#include "fstext/kaldi-fst-io.h"
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#include "util/parse-options.h"
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#if !defined(_MSC_VER) && !defined(__APPLE__)
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#include <signal.h> // Comment this line and the call to signal below if
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// it causes compilation problems. It is only to enable a debugging procedure
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// when determinization does not terminate. We are disabling this code if
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// compiling on Windows because signal.h is not available there, and on
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// MacOS due to a problem with <signal.h> in the initial release of Sierra.
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#endif
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/* some test examples:
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( echo "0 0 0 0"; echo "0 0" ) | fstcompile | fstdeterminizestar | fstprint
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( echo "0 0 1 0"; echo "0 0" ) | fstcompile | fstdeterminizestar | fstprint
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( echo "0 0 1 0"; echo "0 1 1 0"; echo "0 0" ) | fstcompile | fstdeterminizestar | fstprint
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# this last one fails [correctly]:
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( echo "0 0 0 1"; echo "0 0" ) | fstcompile | fstdeterminizestar | fstprint
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cd ~/tmpdir
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while true; do
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fstrand > 1.fst
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fstpredeterminize out.lst 1.fst | fstdeterminizestar | fstrmsymbols out.lst > 2.fst
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fstequivalent --random=true 1.fst 2.fst || echo "Test failed"
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echo -n "."
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done
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Test of debugging [with non-determinizable input]:
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( echo " 0 0 1 0 1.0"; echo "0 1 1 0"; echo "1 1 1 0 0"; echo "0 2 2 0"; echo "2"; echo "1" ) | fstcompile | fstdeterminizestar
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kill -SIGUSR1 [the process-id of fstdeterminizestar]
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# prints out a bunch of debugging output showing the mess it got itself into.
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*/
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bool debug_location = false;
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void signal_handler(int) {
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debug_location = true;
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}
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int main(int argc, char *argv[]) {
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try {
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using namespace kaldi;
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using namespace fst;
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using kaldi::int32;
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const char *usage =
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"Removes epsilons and determinizes in one step\n"
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"\n"
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"Usage: fstdeterminizestar [in.fst [out.fst] ]\n"
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"\n"
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"See also: fstdeterminizelog, lattice-determinize\n";
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float delta = kDelta;
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int max_states = -1;
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bool use_log = false;
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ParseOptions po(usage);
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po.Register("use-log", &use_log, "Determinize in log semiring.");
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po.Register("delta", &delta, "Delta value used to determine equivalence of weights.");
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po.Register("max-states", &max_states, "Maximum number of states in determinized FST before it will abort.");
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po.Read(argc, argv);
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if (po.NumArgs() > 2) {
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po.PrintUsage();
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exit(1);
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}
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std::string fst_in_str = po.GetOptArg(1),
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fst_out_str = po.GetOptArg(2);
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// This enables us to get traceback info from determinization that is
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// not seeming to terminate.
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#if !defined(_MSC_VER) && !defined(__APPLE__)
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signal(SIGUSR1, signal_handler);
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#endif
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// Normal case: just files.
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VectorFst<StdArc> *fst = ReadFstKaldi(fst_in_str);
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ArcSort(fst, ILabelCompare<StdArc>()); // improves speed.
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if (use_log) {
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DeterminizeStarInLog(fst, delta, &debug_location, max_states);
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} else {
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VectorFst<StdArc> det_fst;
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DeterminizeStar(*fst, &det_fst, delta, &debug_location, max_states);
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*fst = det_fst; // will do shallow copy and then det_fst goes
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// out of scope anyway.
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}
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WriteFstKaldi(*fst, fst_out_str);
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delete fst;
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return 0;
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} catch(const std::exception &e) {
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std::cerr << e.what();
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return -1;
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}
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}
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