1
2 // Licensed under the Apache License, Version 2.0 (the "License");
3 // you may not use this file except in compliance with the License.
4 // You may obtain a copy of the License at
5 //
6 // http://www.apache.org/licenses/LICENSE-2.0
7 //
8 // Unless required by applicable law or agreed to in writing, software
9 // distributed under the License is distributed on an "AS IS" BASIS,
10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 // See the License for the specific language governing permissions and
12 // limitations under the License.
13 //
14 // Copyright 2005-2010 Google, Inc.
15 // Author: jpr@google.com (Jake Ratkiewicz)
16
17 #ifndef FST_SCRIPT_RANDGEN_H_
18 #define FST_SCRIPT_RANDGEN_H_
19
20 #include <fst/script/arg-packs.h>
21 #include <fst/script/fst-class.h>
22 #include <fst/randgen.h>
23
24 namespace fst {
25 namespace script {
26
27 enum RandArcSelection {
28 UNIFORM_ARC_SELECTOR,
29 LOG_PROB_ARC_SELECTOR,
30 FAST_LOG_PROB_ARC_SELECTOR
31 };
32
33 typedef args::Package<const FstClass &, MutableFstClass*, int32,
34 const RandGenOptions<RandArcSelection> &> RandGenArgs;
35
36 template<class Arc>
RandGen(RandGenArgs * args)37 void RandGen(RandGenArgs *args) {
38 const Fst<Arc> &ifst = *(args->arg1.GetFst<Arc>());
39 MutableFst<Arc> *ofst = args->arg2->GetMutableFst<Arc>();
40 int32 seed = args->arg3;
41 const RandGenOptions<RandArcSelection> &opts = args->arg4;
42
43 if (opts.arc_selector == UNIFORM_ARC_SELECTOR) {
44 UniformArcSelector<Arc> arc_selector(seed);
45 RandGenOptions< UniformArcSelector<Arc> >
46 ropts(arc_selector, opts.max_length,
47 opts.npath, opts.weighted);
48 RandGen(ifst, ofst, ropts);
49 } else if (opts.arc_selector == FAST_LOG_PROB_ARC_SELECTOR) {
50 FastLogProbArcSelector<Arc> arc_selector(seed);
51 RandGenOptions< FastLogProbArcSelector<Arc> >
52 ropts(arc_selector, opts.max_length,
53 opts.npath, opts.weighted);
54 RandGen(ifst, ofst, ropts);
55 } else {
56 LogProbArcSelector<Arc> arc_selector(seed);
57 RandGenOptions< LogProbArcSelector<Arc> >
58 ropts(arc_selector, opts.max_length,
59 opts.npath, opts.weighted);
60 RandGen(ifst, ofst, ropts);
61 }
62 }
63
64
65 // Client-facing prototype
66 void RandGen(const FstClass &ifst, MutableFstClass *ofst, int32 seed = time(0),
67 const RandGenOptions<RandArcSelection> &opts =
68 fst::RandGenOptions<fst::script::RandArcSelection>(
69 fst::script::UNIFORM_ARC_SELECTOR));
70
71 } // namespace script
72 } // namespace fst
73
74
75
76 #endif // FST_SCRIPT_RANDGEN_H_
77