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      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