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 24namespace fst { 25namespace script { 26 27enum RandArcSelection { 28 UNIFORM_ARC_SELECTOR, 29 LOG_PROB_ARC_SELECTOR, 30 FAST_LOG_PROB_ARC_SELECTOR 31}; 32 33typedef args::Package<const FstClass &, MutableFstClass*, int32, 34 const RandGenOptions<RandArcSelection> &> RandGenArgs; 35 36template<class Arc> 37void 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 66void 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