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Diffstat (limited to 'src/bin/fstrmepsilon.cc')
-rw-r--r-- | src/bin/fstrmepsilon.cc | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/bin/fstrmepsilon.cc b/src/bin/fstrmepsilon.cc new file mode 100644 index 0000000..63a80b8 --- /dev/null +++ b/src/bin/fstrmepsilon.cc @@ -0,0 +1,89 @@ +// fstrmepsilon.cc + +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// Copyright 2005-2010 Google, Inc. +// Author: riley@google.com (Michael Riley) +// Modified: jpr@google.com (Jake Ratkiewicz) to use FstClass +// +// \file +// Removes epsilons from an FST. +// + +#include <fst/script/rmepsilon.h> + +DEFINE_bool(connect, true, "Trim output"); +DEFINE_double(delta, fst::kDelta, "Comparison/quantization delta"); +DEFINE_int64(nstate, fst::kNoStateId, "State number threshold"); +DEFINE_bool(reverse, false, "Perform in the reverse direction"); +DEFINE_string(weight, "", "Weight threshold"); +DEFINE_string(queue_type, "auto", "Queue type: one of: \"auto\", " + "\"fifo\", \"lifo\", \"shortest\", \"state\", \"top\""); + +int main(int argc, char **argv) { + namespace s = fst::script; + using fst::script::FstClass; + using fst::script::MutableFstClass; + using fst::script::VectorFstClass; + using fst::script::WeightClass; + + string usage = "Removes epsilons from an FST.\n\n Usage: "; + usage += argv[0]; + usage += " [in.fst [out.fst]]\n"; + + std::set_new_handler(FailedNewHandler); + SetFlags(usage.c_str(), &argc, &argv, true); + if (argc > 3) { + ShowUsage(); + return 1; + } + + string in_fname = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : ""; + string out_fname = argc > 2 ? argv[2] : ""; + + FstClass *ifst = FstClass::Read(in_fname); + if (!ifst) return 1; + + WeightClass weight_threshold = FLAGS_weight.empty() ? + WeightClass::Zero() : + WeightClass(ifst->WeightType(), FLAGS_weight); + + fst::QueueType qt; + + if (FLAGS_queue_type == "auto") { + qt = fst::AUTO_QUEUE; + } else if (FLAGS_queue_type == "fifo") { + qt = fst::FIFO_QUEUE; + } else if (FLAGS_queue_type == "lifo") { + qt = fst::LIFO_QUEUE; + } else if (FLAGS_queue_type == "shortest") { + qt = fst::SHORTEST_FIRST_QUEUE; + } else if (FLAGS_queue_type == "state") { + qt = fst::STATE_ORDER_QUEUE; + } else if (FLAGS_queue_type == "top") { + qt = fst::TOP_ORDER_QUEUE; + } else { + LOG(ERROR) << "Unknown or unsupported queue type: " << FLAGS_queue_type; + return 1; + } + + s::RmEpsilonOptions opts(qt, FLAGS_delta, FLAGS_connect, + weight_threshold, FLAGS_nstate); + + MutableFstClass *ofst = new VectorFstClass(ifst->ArcType()); + s::RmEpsilon(*ifst, ofst, FLAGS_reverse, opts); + + ofst->Write(out_fname); + + return 0; +} |