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 (at) 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> 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
