1 // fstreweight.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@google.com (Cyril Allauzen)
17 // Modified: jpr@google.com (Jake Ratkiewicz) to use FstClass
18 //
19 // \file
20 // Reweights an FST.
21 //
22
23 #include <fst/script/reweight.h>
24 #include <fst/script/text-io.h>
25
26 DEFINE_bool(to_final, false, "Push/reweight to final (vs. to initial) states");
27
main(int argc,char ** argv)28 int main(int argc, char **argv) {
29 namespace s = fst::script;
30 using fst::script::FstClass;
31 using fst::script::MutableFstClass;
32
33 string usage = "Reweights an FST.\n\n Usage: ";
34 usage += argv[0];
35 usage += " in.fst potential.txt [out.fst]\n";
36
37 std::set_new_handler(FailedNewHandler);
38 SetFlags(usage.c_str(), &argc, &argv, true);
39 if (argc < 3 || argc > 4) {
40 ShowUsage();
41 return 1;
42 }
43
44 string in_fname = argv[1];
45 string potentials_fname = argv[2];
46 string out_fname = argc > 3 ? argv[3] : "";
47
48 MutableFstClass *fst = MutableFstClass::Read(in_fname, true);
49 if (!fst) return 1;
50
51 vector<s::WeightClass> potential;
52 if (!s::ReadPotentials(fst->WeightType(), potentials_fname, &potential))
53 return 1;
54
55 fst::ReweightType reweight_type = FLAGS_to_final ?
56 fst::REWEIGHT_TO_FINAL :
57 fst::REWEIGHT_TO_INITIAL;
58
59 s::Reweight(fst, potential, reweight_type);
60 fst->Write(out_fname);
61
62 return 0;
63 }
64