1 // fstrmepsilon.cc 2 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 // Copyright 2005-2010 Google, Inc. 16 // Author: riley (at) google.com (Michael Riley) 17 // Modified: jpr (at) google.com (Jake Ratkiewicz) to use FstClass 18 // 19 // \file 20 // Removes epsilons from an FST. 21 // 22 23 #include <fst/script/rmepsilon.h> 24 25 DEFINE_bool(connect, true, "Trim output"); 26 DEFINE_double(delta, fst::kDelta, "Comparison/quantization delta"); 27 DEFINE_int64(nstate, fst::kNoStateId, "State number threshold"); 28 DEFINE_bool(reverse, false, "Perform in the reverse direction"); 29 DEFINE_string(weight, "", "Weight threshold"); 30 DEFINE_string(queue_type, "auto", "Queue type: one of: \"auto\", " 31 "\"fifo\", \"lifo\", \"shortest\", \"state\", \"top\""); 32 33 int main(int argc, char **argv) { 34 namespace s = fst::script; 35 using fst::script::FstClass; 36 using fst::script::MutableFstClass; 37 using fst::script::VectorFstClass; 38 using fst::script::WeightClass; 39 40 string usage = "Removes epsilons from an FST.\n\n Usage: "; 41 usage += argv[0]; 42 usage += " [in.fst [out.fst]]\n"; 43 44 std::set_new_handler(FailedNewHandler); 45 SET_FLAGS(usage.c_str(), &argc, &argv, true); 46 if (argc > 3) { 47 ShowUsage(); 48 return 1; 49 } 50 51 string in_fname = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : ""; 52 string out_fname = argc > 2 ? argv[2] : ""; 53 54 FstClass *ifst = FstClass::Read(in_fname); 55 if (!ifst) return 1; 56 57 WeightClass weight_threshold = FLAGS_weight.empty() ? 58 WeightClass::Zero() : 59 WeightClass(ifst->WeightType(), FLAGS_weight); 60 61 fst::QueueType qt; 62 63 if (FLAGS_queue_type == "auto") { 64 qt = fst::AUTO_QUEUE; 65 } else if (FLAGS_queue_type == "fifo") { 66 qt = fst::FIFO_QUEUE; 67 } else if (FLAGS_queue_type == "lifo") { 68 qt = fst::LIFO_QUEUE; 69 } else if (FLAGS_queue_type == "shortest") { 70 qt = fst::SHORTEST_FIRST_QUEUE; 71 } else if (FLAGS_queue_type == "state") { 72 qt = fst::STATE_ORDER_QUEUE; 73 } else if (FLAGS_queue_type == "top") { 74 qt = fst::TOP_ORDER_QUEUE; 75 } else { 76 LOG(ERROR) << "Unknown or unsupported queue type: " << FLAGS_queue_type; 77 return 1; 78 } 79 80 s::RmEpsilonOptions opts(qt, FLAGS_delta, FLAGS_connect, 81 weight_threshold, FLAGS_nstate); 82 83 MutableFstClass *ofst = new VectorFstClass(ifst->ArcType()); 84 s::RmEpsilon(*ifst, ofst, FLAGS_reverse, opts); 85 86 ofst->Write(out_fname); 87 88 return 0; 89 } 90
