1 // fstpush.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@google.com (Michael Riley)
17 // Modified: jpr@google.com (Jake Ratkiewicz) to use FstClass
18 // \file
19 // Pushes weights and/or output labels in an FST toward the initial or
20 // final states.
21
22 #include <fst/script/push.h>
23
24 DEFINE_double(delta, fst::kDelta, "Comparison/quantization delta");
25 DEFINE_bool(push_weights, false, "Push weights");
26 DEFINE_bool(push_labels, false, "Push output labels");
27 DEFINE_bool(remove_total_weight, false,
28 "Remove total weight when pushing weights");
29 DEFINE_bool(remove_common_affix, false,
30 "Remove common prefix/suffix when pushing labels");
31 DEFINE_bool(to_final, false, "Push/reweight to final (vs. to initial) states");
32
33
main(int argc,char ** argv)34 int main(int argc, char **argv) {
35 namespace s = fst::script;
36 using fst::script::FstClass;
37 using fst::script::VectorFstClass;
38
39 string usage = "Pushes weights and/or olabels in an FST.\n\n Usage: ";
40 usage += argv[0];
41 usage += " [in.fst [out.fst]]\n";
42
43 std::set_new_handler(FailedNewHandler);
44 SET_FLAGS(usage.c_str(), &argc, &argv, true);
45 if (argc > 3) {
46 ShowUsage();
47 return 1;
48 }
49
50 string in_name = (argc > 1 && strcmp(argv[1], "-") != 0) ? argv[1] : "";
51 string out_name = argc > 2 ? argv[2] : "";
52
53 FstClass *ifst = FstClass::Read(in_name);
54 if (!ifst) return 1;
55
56 uint32 flags = 0;
57 if (FLAGS_push_weights)
58 flags |= fst::kPushWeights;
59 if (FLAGS_push_labels)
60 flags |= fst::kPushLabels;
61 if (FLAGS_remove_total_weight)
62 flags |= fst::kPushRemoveTotalWeight;
63 if (FLAGS_remove_common_affix)
64 flags |= fst::kPushRemoveCommonAffix;
65
66 VectorFstClass ofst(ifst->ArcType());
67
68 if (FLAGS_to_final) {
69 s::Push(*ifst, &ofst, flags, fst::REWEIGHT_TO_FINAL, FLAGS_delta);
70 } else {
71 s::Push(*ifst, &ofst, flags, fst::REWEIGHT_TO_INITIAL, FLAGS_delta);
72 }
73
74 ofst.Write(out_name);
75
76 return 0;
77 }
78