1 // fstprune.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: allauzen (at) google.com (Cyril Allauzen) 17 // Modified: jpr (at) google.com (Jake Ratkiewicz) to use FstClass 18 // 19 // \file 20 // Prunes states and arcs of an FST w.r.t. the shortest path weight. 21 // 22 23 #include <fst/script/prune.h> 24 25 DEFINE_double(delta, fst::kDelta, "Comparison/quantization delta"); 26 DEFINE_int64(nstate, fst::kNoStateId, "State number threshold"); 27 DEFINE_string(weight, "", "Weight threshold"); 28 29 30 int main(int argc, char **argv) { 31 namespace s = fst::script; 32 using fst::script::FstClass; 33 using fst::script::MutableFstClass; 34 using fst::script::WeightClass; 35 36 string usage = "Prunes states and arcs of an FST.\n\n Usage: "; 37 usage += argv[0]; 38 usage += " [in.fst [out.fst]]\n"; 39 40 std::set_new_handler(FailedNewHandler); 41 SET_FLAGS(usage.c_str(), &argc, &argv, true); 42 if (argc > 3) { 43 ShowUsage(); 44 return 1; 45 } 46 47 string in_name = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : ""; 48 string out_name = argc > 2 ? argv[2] : ""; 49 50 MutableFstClass *fst = MutableFstClass::Read(in_name, true); 51 if (!fst) return 1; 52 53 WeightClass weight_threshold = FLAGS_weight.empty() ? 54 WeightClass::Zero() : 55 WeightClass(fst->WeightType(), FLAGS_weight); 56 57 s::PruneOptions opts(weight_threshold, FLAGS_nstate, 0, FLAGS_delta); 58 59 s::Prune(fst, opts); 60 61 fst->Write(out_name); 62 63 return 0; 64 } 65
